DATA SH EET
Product specification
Supersedes data of 2000 Jun 30
File under Integrated Circuits, IC02
2001 Feb 13
INTEGRATED CIRCUITS
SAA56xx
Enhanced TV microcontrollers with
On-Screen Display (OSD)
2001 Feb 13 2
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
CONTENTS
1 FEATURES
2 GENERAL DESCRIPTION
3 QUICK REFERENCE DATA
4 ORDERING INFORMATION
5 BLOCK DIAGRAM
6 PINNING INFORMATION
7 MICROCONTROLLER
8 MEMORY ORGANISATION
9 POWER-ON RESET
10 POWER SAVING MODES OF OPERATION
11 I/O FACILITY
12 INTERRUPT SYSTEM
13 TIMERS/COUNTERS
14 WATCHDOG TIMER
15 PORT ALTERNATIVE FUNCTIONS
16 PULSE WIDTH MODULATORS
17 I2C-BUS SERIAL I/O
18 UART PERIPHERAL
19 LED SUPPORT
20 EXTERNAL SRAM/ROM INTERFACE
21 MEMORY INTERFACE
22 DATA CAPTURE
23 DISPLAY
24 MEMORY MAPPED REGISTERS (MMRs)
25 IN-SYSTEM PROGRAMMING INTERFACE
26 LIMITING VALUES
27 THERMAL CHARACTERISTICS
28 CHARACTERISTICS
29 QUALITY AND RELIABILITY
30 APPLICATION INFORMATION
31 EMC GUIDELINES
32 PACKAGE OUTLINE
33 SOLDERING
34 DATA SHEET STATUS
35 DEFINITIONS
36 DISCLAIMERS
37 PURCHASE OF PHILIPS I2C COMPONENTS
2001 Feb 13 3
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
1 FEATURES
•Single-chip higher frequency microcontroller with
integrated On-Screen Display (OSD)
•Versions available with integrated Data Capture
•Both active HIGH and active LOW reset pins
•OTP memory for both Program ROM and character sets
•In-System Programming (ISP) option for the embedded
OTP memories using IEEE1149 (JTAG: Joint Test
Action Group) interface
•Single power supply: 3.0 to 3.6 V
•5 V tolerant digital inputs and I/O
•32 I/O ports via individual addressable controls
•Larger Character ROM, up to 1020 characters
of 12 ×10 pixels
•Smoothing capability on sized characters
•Programmable I/O for push-pull, open-drain and
quasi-bidirectional and high-impedance
•Two port lines with 8 mA sink (at <0.4 V) capability, for
direct drive of LED
•Single crystal oscillator for microcontroller, OSD and
Data Capture
•Power reduction modes: Idle, Standby and Power-down
•Byte level I2C-bus up to 400 kHz dual port I/O
•64 Dynamically Redefinable Characters for OSDs
•Increased special graphic characters allowing four
colours per character
•Selectable character height 9, 10, 13 and 16 TV lines
•Pin compatibility throughout family
•Operating temperature: −20 to +70 °C.
2 GENERAL DESCRIPTION
The SAA56xx family of microcontrollers are a derivative of
the Philips industry-standard 80C51 microcontroller and
are intended for use as the central control mechanism in a
television receiver. They provide control functions for the
television system, OSD and incorporate an integrated
Data Capture and display function for either Teletext or
Closed Caption.
Additional features over the SAA55xx family have been
included, e.g. 100/120 Hz (2H/2V only) display timing
modes, two page operation (50/60 Hz mode for 16:9, 4:3),
higher frequency microcontroller, increased character
storage, more 80C51 peripherals and a larger Display
memory. For CC operation, only a 50/60 Hz display option
is available.
As with the rest of the SAA55xx family, the Data Capture
hardware can decode and display both 525-line and
625-line World System Teletext (WST), Closed Caption
information, Video Programming System (VPS)
Information and Wide Screen Signalling (WSS)
information. The same display hardware is used for
Teletext, Closed Caption and On-Screen Display, which
means that the display features available give greater
flexibility to differentiate the TV set.
The family of devices offers a range of memory variants
withProgramROMsizes of 128-kbyte and 192-kbyte, also
up to 14 kbytes of RAM.
2001 Feb 13 4
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
3 QUICK REFERENCE DATA
4 ORDERING INFORMATION
Notes
1. ‘nnnn’ is a four digit number uniquely referencing the microcontroller program mask.
2. Extendible to 8-kbyte in external SRAM application, see Fig.8.
3. Text/CC full-feature device.
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
Supply
VDDX any supply voltage (VDD to VSS) 3.0 3.3 3.6 V
IDDP periphery supply current 1.0 −−mA
IDDC core supply current −15.0 18.0 mA
IDD(id) Idle mode supply current −4.6 6.0 mA
IDD(pd) Power-down mode supply current −0.76 1.0 mA
IDDA analog supply current −45.0 48.0 mA
IDDA(id) Idle mode analog supply current −0.87 1.0 mA
IDDA(pd) Power-down mode analog supply current −0.45 0.7 mA
fxtal crystal frequency −12.0 −MHz
Tamb operating ambient temperature −20 −+70 °C
Tstg storage temperature −55 −+125 °C
TYPE
NUMBER(1) PACKAGE ROM DATA
RAM TEXT PAGES
NAME DESCRIPTION VERSION
SAA5667HL/nnnn LQFP100 plastic low profile quad flat
package; 100 leads; body
14 ×14 ×1.4 mm
SOT407-1 192-kbyte 2-kbyte(2) 12(3)
SAA5665HL/nnnn 128-kbyte 12(3)
SAA5647HL/nnnn 192-kbyte CC-OSD ONLY
SAA5645HL/nnnn 128-kbyte CC-OSD ONLY
2001 Feb 13 5
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
5 BLOCK DIAGRAM
handbook, full pagewidth
GSA023
MICROPROCESSOR
(80C51) SRAM
256-byte
ROM
(128 or 192-kbyte)
MEMORY
INTERFACE
DISPLAY
R
G
B
VDS
HSYNC
VSYNC
CVBS DATA
CAPTURE
DRAM
(14-kbyte)
TV CONTROL
AND
INTERFACE
I2C-bus, general I/O
DISPLAY
TIMING
CVBS DATA
CAPTURE
TIMING
Fig.1 Block diagram (top level architecture).
2001 Feb 13 6
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
6 PINNING INFORMATION
6.1 Pinning
handbook, full pagewidth
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
5125
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
P3.7
P0.4/INT4
A6
P0.3/INT3
VPE
ALE
PSEN
P0.2/INT2
P0.1/TX
P0.0/RX
A7
EA
P0.5
VSSP
VSSC
WR
RD
A14
A15_LN
P3.3/ADC3
P3.2/ADC2
P3.1/ADC1
A17_LN
P3.0/ADC0
P2.7/PWM6
RAMBK0
VDS
HSYNC
P3.5/INT5
VSYNC
ROMBK2
ROMBK1
ROMBK0
P3.6
VSSP
INTD
VSSC
VDDC
A11
A10
A9
A8
MOVX_WR
OSCGND
XTALIN
XTALOUT
RESET
RESET
MOVX_RD
VDDP
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
P2.0/TPWM
VSSC
P2.6/PWM5
P2.5/PWM4
P2.4/PWM3
P2.3/PWM2
P2.2/PWM1
P2.1/PWM0
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
P1.5/SDA1
P1.4/SCL1
P1.7/SDA0
P1.6/SCL0
P1.3/T1
P1.2/INT0
P1.1/T0
A16_LN
P1.0/INT1
A5
A4
P0.6
P0.7/T2
VSSA
CVBS0
CVBS1
A15_BK
SYNC_FILTER
IREF
A13
A12
A3
A2
A1
FRAME
VPE
COR
P3.4/PWM7/T2EX
VDDA
B
G
R
A0
RAMBK1
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
GSA020
SAA56xx
Fig.2 Pin configuration.
2001 Feb 13 7
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
6.2 Pin description
Table 1 LQFP100 package
SYMBOL PIN TYPE DESCRIPTION
P2.0/TPWM 100 I/O Port 2. 8-bit programmable bidirectional port with alternative functions.
P2.0/TPWM is the output for the 14-bit high precision PWM; P2.1/PWM0 to
P2.7/PWM6 are the outputs for the 6-bit PWMs 0 to 6.
P2.1/PWM0 93 I/O
P2.2/PWM1 94 I/O
P2.3/PWM2 95 I/O
P2.4/PWM3 96 I/O
P2.5/PWM4 97 I/O
P2.6/PWM5 98 I/O
P2.7/PWM6 1 I/O
P3.0/ADC0 2 I/O Port 3. 8-bit programmable bidirectional port with alternative functions.
P3.0/ADC0 to P3.3/ADC3 are the inputs for the software ADC facility and
P3.4/PWM7 is the output for the 6-bit PWM7; P3.4/PWM7/T2EX is the
output for the 6-bit PWM7 or the Timer 2 control; P3.5/INT5 is the external
Interrupt 5; P3.6 and P3.7 have no alternative functions.
P3.1/ADC1 4 I/O
P3.2/ADC2 5 I/O
P3.3/ADC3 6 I/O
P3.4/PWM7/T2EX 44 I/O
P3.5/INT5 54 I/O
P3.6 59 I/O
P3.7 25 I/O
VSSC 11, 62, 99 −core ground
P0.0/RX 16 I/O Port 0. 8-bit programmable bidirectional port (with alternative functions).
P0.0/RX and P0.1/TX are respectively the serial transmit and receive lines
for the UART; P0.2/INT2 to P0.4/INT4 are the external interrupts 2 to 4;
P0.5 and P0.6 have no alternative functions and have 8 mA current sinking
capability for direct drive of LEDs.
P0.1/TX 17 I/O
P0.2/INT2 18 I/O
P0.3/INT3 22 I/O
P0.4/INT4 24 I/O
P0.5 13 I/O
P0.6 28 I/O
P0.7/T2 29 I/O
VSSA 30 −analog ground
CVBS0 31 I 2 composite video input selectable via SFR; a positive-going 1 V
(peak-to-peak) input is required, connected via a 100 nF capacitor
CVBS1 32 I
SYNC_FILTER 34 I/O CVBS sync filter input; this pin should be connected to VSSA via a 100 nF
capacitor.
IREF 35 I Reference current input for analog circuits, connected to VSSA via a 24 kΩ
resistor.
FRAME 41 O De-interlace output synchronized with the VSYNC pulse to produce a
non-interlaced display by adjustment of the vertical deflection circuits.
VPE 21, 42 I OTP programming voltage
COR 43 O Open-drain, active LOW output which allows selective contrast reduction of
the TV picture to enhance a mixed mode display.
VDDA 45 −+3.3 V analog power supply
B 46 O pixel rate output of the BLUE colour information
2001 Feb 13 8
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
G 47 O pixel rate output of the GREEN colour information
R 48 O pixel rate output of the RED colour information
VDS 52 O video/data switch push-pull output for dot rate fast blanking
HSYNC 53 I Schmitt triggered input for a TTL-level version of the horizontal sync pulse;
the polarity of this pulse is programmable by register bit TXT1.H POLARITY.
VSYNC 55 I Schmitt triggered input for a TTL-level version of the vertical sync pulse; the
polarity of this pulse is programmable by register bit TXT1.V POLARITY.
VSSP 12, 60 −periphery ground
VDDC 63 −+3.3 V core power supply
OSCGND 69 −crystal oscillator ground
XTALIN 70 I 12 MHz crystal oscillator input
XTALOUT 71 O 12 MHz crystal oscillator output
RESET 72 I If the reset input is LOW for at least 24 crystal oscillator periods while the
oscillator is running, the device is reset (internal pull-up).
RESET 73 I If the reset input is HIGH for at least 24 crystal oscillator periods while the
oscillator is running, the device is reset. This pin should be connected to
VDDC via a capacitor if an active HIGH reset is required (internal pull-down).
VDDP 75 −+3.3 V periphery power supply
P1.0/INT1 76 I/O Port 1. 8-bit programmable bidirectional port with alternative functions.
P1.0/INT1 is external interrupt 1 which can be triggered on the rising and
falling edge of the pulse; P1.1/T0 is Timer/counter 0; P1.2/INT0 is external
interrupt 0; P1.3/T1 is Timer/counter 1; P1.6/SCL0 is the serial clock input
for the I2C-bus; P1.7/SDA0 is the serial data port for the I2C-bus; P1.4/SCL1
is the serial clock input for the I2C-bus; P1.5/SDA1 is the serial data port for
the I2C-bus.
P1.1/T0 78 I/O
P1.2/INT0 79 I/O
P1.3/T1 80 I/O
P1.6/SCL0 81 I/O
P1.7/SDA0 82 I/O
P1.4/SCL1 83 I/O
P1.5/SDA1 84 I/O
RD 9 O read control signal to external data memory
WR 10 O write control signal to external data memory
EA 14 I Control signal used to select external (LOW) or internal (HIGH) program
memory (internal pull-up).
PSEN 19 O enable signal for external program memory
ALE 20 O external latch enable signal; active HIGH
AD0 to AD7 85 to 92 I/O address lines A0 to A7 multiplexed with data lines D0 to D7.
A0 to A7 49, 40,39,
38,27, 26,
23, 15
O address lines A0 to A7
A8 to A14 67 to 64,
37, 36, 8 O address lines A8 to A14
A15_LN to A17_LN 7, 77, 3 O address lines A15 to A17; note 1
MOVX_WR 68 O MOVX Write for Hitex 80C51 emulation (internal MOVX Write instruction)
MOVX_RD 74 O MOVX Read for Hitex 80C51 emulation (internal MOVX Read instruction)
SYMBOL PIN TYPE DESCRIPTION
2001 Feb 13 9
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Note
1. A15_LN, A16_LN and A17_LN form a linear address space and may be used as an alternative to A15_BK (pin 33)
and ROMBK2 to ROMBK0 (pins 56, 57 and 58) for external program ROM access.
A15_BK 33 O address line A15 when using ROMBK outputs for external program ROM
access
ROMBK0 to
ROMBK2 58 to 56 O ROMBK SFR selection bits for external program ROM access >64 kbytes
RAMBK0 to
RAMBK1 51, 50 O ROMBK SFR selection bits for external program SRAM data storage
>64 kbytes. Use A0 to A14 and A15_BK as lower address bits.
INTD 61 I interrupt disable for emulation (internal pull-up)
SYMBOL PIN TYPE DESCRIPTION
7 MICROCONTROLLER
The functionality of the microcontroller used in this device
is described here with reference to the industry standard
80C51 microcontroller. A full description of its functionality
can be found in
“Handbook IC20 80C51-Based 8-bit
Microcontrollers”
.
7.1 Microcontroller features
•80C51 microcontroller core standard instruction set and
timing
•0.5 µs machine cycle
•Maximum 192K ×8-bit Program ROM
•Maximum of 14K ×8-bit data and display RAM
•15-level interrupt controller with individual
enable/disable and two level priority
•Up to six external interrupts with programmable
detection characteristics
•Three 16-bit Timer/counter registers
•Watchdog Timer
•Auxiliary RAM page pointer
•16-bit Data pointer
•Idle, Standby and Power-down modes
•32 general I/O lines
•Eight 6-bit Pulse Width Modulator (PWM) outputs for
control of TV analog signals
•One 14-bit PWM for Voltage Synthesis Tuner (VST)
control
•8-bit Analog-to-Digital Converter (ADC) with four
multiplexed inputs
•Two high current outputs for directly driving LEDs etc.
•I2C-bus byte level interface with dual ports
•UART for asynchronous serial communication
•External ROM and SRAM compatibility.
8 MEMORY ORGANISATION
The device has the capability of a maximum of 192-kbyte
Program ROM and 14-kbyte Data RAM internally.
8.1 ROM bank switching
The 128-kbyte Program ROM variant is arranged in four
banks of 32 kbytes. One of the 32-kbyte banks is common
and is always addressable. The other three banks
(Bank 0, Bank 1 and Bank 2) can be selected with SFR
ROMBK bits <2:0> (see Table 2 and Fig. 3).
The 192-kbyte Program ROM variant is arranged in six
banks of 32 kbytes. One of the 32-kbyte banks is common
and is always addressable. The other five banks (Bank 0,
Bank 1, Bank 2, Bank 3 and Bank 4) can be selected with
SFR ROMBK bits <2:0> (see Table 2 and Fig. 3).
Table 2 ROM bank selection
ROMBK2 ROMBK1 ROMBK0 0to
32-kbyte 32 to
64-kbyte
0 0 0 common Bank 0
0 0 1 common Bank 1
0 1 0 common Bank 2
0 1 1 common Bank 3
1 0 0 common Bank 4
1 0 1 reserved reserved
1 1 0 reserved reserved
1 1 1 reserved reserved
2001 Feb 13 10
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
GSA073
7FFFH
0000H
COMMON
(32-kbyte) Physical address
Range: 0 to 32-kbyte
FFFFH
8000H
BANK 2
(32-kbyte)
FFFFH
8000H
BANK 3
(32-kbyte)
FFFFH
8000H
BANK 4
(32-kbyte)
FFFFH
8000H
BANK 1
(32-kbyte)
FFFFH
8000H
BANK 0
(32-kbyte)
Physical address
Range: 96 to 128-kbyte Physical address
Range: 128 to 160-kbyte Physical address
Range: 160 to 192-kbyte
Physical address
Range: 64 to 96-kbyte
Physical address
Range: 32 to 64-kbyte
Fig.3 Internal program memory.
2001 Feb 13 11
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
8.2 ROM protection and verification
SAA56xx devices have a set of security bits allied with
each section of the device, i.e. Program ROM, Character
ROM and Packet 26 ROM. The security bits are used to
prevent the ROM from being overwritten once
programmed, and also the contents being verified once
programmed.
The security bits can be programmed once only and
cannot be erased.
The SAA56xx security bits are set as shown in Fig.4 for
production programmed devices and are set as shown in
Fig.5 for production blank devices.
handbook, full pagewidth
GSA036
PROGRAM ROM
(128 or 192 kbytes)
MEMORY
USER ROM PROGRAMMING VERIFY
DISABLED ENABLED
DISABLED ENABLED
DISABLED ENABLED
SECURITY BITS SET
CHARACTER ROM
(12 kbytes)
PACKET 26 ROM
(4 kbytes)
Fig.4 Security bits for production programmed devices.
handbook, full pagewidth
GSA037
PROGRAM ROM
(128 OR 192 kbytes)
MEMORY
USER ROM PROGRAMMING VERIFY
ENABLED ENABLED
ENABLED ENABLED
ENABLED ENABLED
SECURITY BITS SET
CHARACTER ROM
(12 kbytes)
PACKET 26 ROM
(4 kbytes)
Fig.5 Security bits for production blank devices.
2001 Feb 13 12
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
8.3 RAM organisation
Figure 6 shows the internal Data RAM is organised into
two areas: Data memory and the Special Function
Registers (SFRs).
8.4 Data memory
The Data memory (see Fig.6) is 256 ×8 bits and occupies
addressrange00H to FFHwhenusingindirectaddressing
and 00H to 7FH when using direct addressing. The SFRs
occupy the address range 80H to FFH and are accessible
using direct addressing only.
The lower 128 bytes of Data memory are mapped as
shown in Fig.7. The lowest 32 bytes are grouped into four
banks of eight registers selectable via SFR PSW
bits <4:3> (RS1/RS0; see Table 3), the next 16 bytes
above the register banks form a block of bit addressable
memory space.
The upper 128 bytes are not allocated for any special area
or functions.
Table 3 Bank selection
RS1 RS0 BANK
0 0 Bank 0
0 1 Bank 1
1 0 Bank 2
1 1 Bank 3
handbook, halfpage
MBK956
accessible
by indirect
addressing
only
DATA
MEMORY
FFH
upper 128 bytes
lower 128 bytes
80H
7FH
00H
SPECIAL
FUNCTION
REGISTERS
accessible
by direct
and indirect
addressing
accessible
by direct
addressing
only
Fig.6 Internal Data memory.
handbook, halfpage
GSA060
07H
00H
0FH
08H
17H
10H
1FH
18H
2FH
7FH
20H
bit-addressable
space
(bit addresses
00H to 7FH)
4 banks of
8 registers
(R0 to R7)
bank select
bits in PSW
11 = BANK 3
01 = BANK 1
00 = BANK 0
10 = BANK 2
Fig.7 Lower 128 bytes of internal RAM.
2001 Feb 13 13
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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8.5 SFR memory
The Special Function Register (SFR) space is used for port latches, timer, peripheral control, acquisition control and display control, etc. These registers
can only be accessed by direct addressing. Sixteen of the addresses in the SFR space are both bit and byte addressable. The bit addressable SFRs
are those whose address ends in 0H or 8H. Table 4 only presents the additional SFRs of the SAA56xx family over the SAA55xx family of devices. This
SFR map table must therefore be read in conjunction with the SAA55xx SFR map table.
A description of the new SFR bits is shown in Table 5, which presents the SFRs in alphabetical order.
Table 4 SFR memory map
ADD R/W NAME 7 6 5 4 3 2 1 0 RESET
80H R/W P0 P07 P06 P05 P04 P03 P02 P01 P00 FFH
81H R/W SP SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 07H
82H R/W DPL DPL7 DPL6 DPL5 DPL4 DPL3 DPL2 DPL1 DPL0 00H
83H R/W DPH DPH7 DPH6 DPH5 DPH4 DPH3 DPH2 DPH1 DPH0 00H
84H R/W IEN1 EX5 EX4 EX3 EX2 EUTX EURX EUART ET2 00H
85H R/W IP1 PX5 PX4 PX3 PX2 PUTX PURX PUART PT2 00H
86H R/W EXTINT EX5CFG1 EX5CFG0 EX4CFG1 EX4CFG0 EX3CFG1 EX3CFG0 EX2CFG1 EX2CFG0 00H
87H R/W PCON SMOD ARD RFI WLE GF1 GF0 PD IDL 00H
88H R/W TCON TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 00H
89H R/W TMOD GATE C/TM1 M0 GATEC/TM1M000H
8AH R/W TL0 TL07 TL06 TL05 TL04 TL03 TL02 TL01 TL00 00H
8BH R/W TL1 TL17 TL16 TL15 TL14 TL13 TL12 TL11 TL10 00H
8CH R/W TH0 TH07 TH06 TH05 TH04 TH03 TH02 TH01 TH00 00H
8DH R/W TH1 TH17 TH16 TH15 TH14 TH13 TH12 TH11 TH10 00H
90H R/W P1 P17 P16 P15 P14 P13 P12 P11 P10 FFH
91H R/W GPR1 GPR17 GPR16 GPR15 GPR14 GPR13 GPR12 GPR11 GPR10 00H
92H R/W GPR2 GPR27 GPR26 GPR25 GPR24 GPR23 GPR22 GPR21 GPR20 00H
93H R/W GPR3 GPR37 GPR36 GPR35 GPR34 GPR33 GPR32 GPR31 GPR30 00H
94H R/W GPR4 GPR47 GPR46 GPR45 GPR44 GPR43 GPR42 GPR41 GPR40 00H
95H R/W GPR5 GPR57 GPR56 GPR55 GPR54 GPR53 GPR52 GPR51 GPR50 00H
96H R/W P0CFGA P0CFGA7 P0CFGA6 P0CFGA5 P0CFGA4 P0CFGA3 P0CFGA2 P0CFGA1 P0CFGA0 FFH
97H R/W P0CFGB P0CFGB7 P0CFGB6 P0CFGB5 P0CFGB4 P0CFGB3 P0CFGB2 P0CFGB1 P0CFGB0 00H
98H R/W SADB 0 0 0 DC_COMP SAD3 SAD2 SAD1 SAD0 00H
99H R/W S0CON SM0 SM1 SM2 REN TB8 RB8 TI RI 00H
9AH R/W S0BUF S0BUF S0BUF6 S0BUF5 S0BUF4 S0BUF3 S0BUF2 S0BUF1 S0BUF0 00H
2001 Feb 13 14
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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9CH R/W GPR6 GPR67 GPR66 GPR65 GPR64 GPR63 GPR62 GPR61 GPR60 00H
9DH R/W GPR7 GPR77 GPR76 GPR75 GPR74 GPR73 GPR72 GPR71 GPR70 00H
9EH R/W P1CFGA P1CFGA7 P1CFGA6 P1CFGA5 P1CFGA4 P1CFGA3 P1CFGA2 P1CFGA1 P1CFGA0 FFH
9FH R/W P1CFGB P1CFGB7 P1CFGB6 P1CFGB5 P1CFGB4 P1CFGB3 P1CFGB2 P1CFGB1 P1CFGB0 00H
A0H R/W P2 P27 P26 P25 P24 P23 P22 P21 P20 FFH
A1H R TXT31 −−−−GPF11 GPF10 GPF9 GPF8 00H
A2H R TXT32 9FE11 9FF11 9FF10 9FF9 9FF8 9FF7 9FF6 9FF5 00H
A3H R TXT33 BFE7 BFE6 BFE5 BFE4 BFE3 BFE2 BFE1 BFE0 00H
A4H R TXT34 −−−−BFE11 BFE10 BFE9 BFE8 00H
A5H R/W GPR8 GPR87 GPR86 GPR85 GPR84 GPR83 GPR82 GPR81 GPR80 00H
A6H R/W P2CFGA P2CFGA7 P2CFGA6 P2CFGA5 P2CFGA4 P2CFGA3 P2CFGA2 P2CFGA1 P2CFGA0 FFH
A7H R/W P2CFGB P2CFGB7 P2CFGB6 P2CFGB5 P2CFGB4 P2CFGB3 P2CFGB2 P2CFGB1 P2CFGB0 00H
A8H R/W IEN0 EA EBUSY ES2 ECC ET1 EX1 ET0 EX0 00H
A9H R/W TXT23 NOT B 3 NOT B 2 NOT B 1 NOT B 0 EAST/WEST
BDRCS B
ENABLE BS B1 BS B0 00H
AAH R/W TXT24 BKGNDOUT
BBKGND IN
BCORB OUT
BCORB IN B TEXT OUT B TEXT IN B PICTURE
ON OUT B PICTURE
ON IN B 00H
ABH R/W TXT25 BKGNDOUT
BBKGND IN
BCORB OUT
BCORB IN B TEXT OUT B TEXT IN B PICTURE
ON OUT B PICTURE
ON IN B 00H
ACH R/W TXT26 EXTENDED
DRCS TRANS B C MESH
ENABLE B B MESH
ENABLE B SHADOW
ENABLE B BOX ON
24 B BOX ON
1 B to 23 B BOX ON 0 B 00H
ADH R/W TXT28 MULTI PAGE CC_TXT B ACTIVE
PAGE DISPLAY
BANK B PAGE B3 PAGE B2 PAGE B1 PAGE B0 00H
B0H R/W P3 1 1 1 P34 P33 P32 P31 P30 FFH
B1H R/W TXT27 −−−− SCRB2 SCRB1 SCRB0 00H
B2H R/W TXT18 NOT3 NOT2 NOT1 NOT0 0 0 BS1 BS0 00H
B3H R/W TXT19 TEN TC2 TC1 TC0 0 0 TS1 TS0 00H
B4H R/W TXT20 DRCS
ENABLE OSD
PLANES EXTENDED
SPECIAL
GRAPHICS
CHAR
SELECT
ENABLE
OSD LANG
ENABLE OSD LAN2 OSD LAN1 OSD LAN0 00H
B5H R/W TXT21 DISP
LINES1 DISP
LINES0 CHAR SIZE1 CHAR
SIZE0 I2C PORT 1 CC ON I2C PORT 0 CC/TXT 02H
B6H R TXT22 GPF7 GPF6 GPF5 GPF4 GPF3 GPF2 GPF1 GPFO XXH
ADD R/W NAME 7 6 5 4 3 2 1 0 RESET
2001 Feb 13 15
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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B7H R/W CCLIN 0 0 0 CS4 CS3 CS2 CS1 CS0 15H
B8H R/W IP 0 PBUSY PES2 PCC PT1 PX1 PT0 PX0 00H
B9H R/W TXT17 0 FORCE
ACQ1 FORCE
ACQ0 FORCE
DISP1 FORCE
DISP0 SCREEN
COL2 SCREEN
COL1 SCREEN
COL0 00H
BAH R WSS1 0 0 0 WSS<3:0>
ERROR WSS3 WSS2 WSS1 WSS0 00H
BBH R WSS2 0 0 0 WSS<7:4>
ERROR WSS7 WSS6 WSS5 WSS4 00H
BCH R WSS3 WSS<13:11>
ERROR WSS13 WSS12 WSS11 WSS<10:8>
ERROR WSS10 WSS9 WSS8 00H
BDH R/W GPR9 GPR97 GPR96 GPR95 GPR94 GPR93 GPR92 GPR91 GPR90 00H
BEH R/W P3CFGA P3CFGA7 P3CFGA6 P3CFGA5 P3CFGA4 P3CFGA3 P3CFGA2 P3CFGA1 P3CFGA0 FFH
BFH R/W P3CFGB P3CFGB7 P3CFGB6 P3CFGB5 P3CFGB4 P3CFGB3 P3CFGB2 P3CFGB1 P3CFGB0 00H
C0H R/W TXT0 X24 POSN DISPLAY
X24 AUTO
FRAME DISABLE
HEADER
ROLL
DISPLAY
STATUS
ROW ONLY
DISABLE
FRAME VPS ON INV ON 00H
C1H R/W TXT1 EXT PKT
OFF 8-BIT ACQ OFF X26 OFF FULL FIELD FIELD
POLARITY H
POLARITY V
POLARITY 00H
C2H R/W TXT2 ACQ BANK REQ3 REQ2 REQ1 REQ0 SC2 SC1 SC0 00H
C3H W TXT3 −−−PRD4 PRD3 PRD2 PRD1 PRD0 00H
C4H R/W TXT4 OSD BANK
ENABLE QUAD
WIDTH
ENABLE
EAST/WEST DISABLE
DOUBLE
HEIGHT
B MESH
ENABLE C MESH
ENABLE TRANS
ENABLE SHADOW
ENABLE 00H
C5H R/W TXT5 BKGND OUT BKGND IN COR OUT COR IN TEXT OUT TEXT IN PICTURE
ON OUT PICTURE
ON IN 03H
C6H R/W TXT6 BKGND OUT BKGND IN COR OUT COR IN TEXT OUT TEXT IN PICTURE
ON OUT PICTURE
ON IN 03H
C7H R/W TXT7 STATUS
ROW TOP CURSOR
ON REVEAL BOTTOM/
TOP DOUBLE
HEIGHT BOX ON 24 BOX ON
1-23 BOX ON 0 00H
C8H R/W TXT8 (reserved) 0 FLICKER
STOP ON (reserved) 0 DISABLE
SPANISH PKT 26
RECEIVED WSS
RECEIVED WSS ON CVBS1/
CVBS0 00H
C9H R/W TXT9 CURSOR
FREEZE CLEAR
MEMORY A0 R4 R3 R2 R1 R0 00H
CAH R/W TXT10 0 0 C5 C4 C3 C2 C1 C0 00H
CBH R/W TXT11 D7 D6 D5 D4 D3 D2 D1 D0 00H
ADD R/W NAME 7 6 5 4 3 2 1 0 RESET
2001 Feb 13 16
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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CCH R TXT12 525/625
SYNC SPANISH ROM VER3 ROM VER2 ROM VER1 ROM VER0 1 VIDEO
SIGNAL
QUALITY
XXXX
XX1X
CDH R/W TXT14 0 0 0 DISPLAY
BANK PAGE3 PAGE2 PAGE1 PAGE0 00H
CEH R/W TXT15 0 0 0 MICRO
BANK BLOCK3 BLOCK2 BLOCK1 BLOCK0 00H
CFH R/W CCBASE CCBASE7 CCBASE6 CCBASE5 CCBASE4 CCBASE3 CCBASE2 CCBASE1 CCBASE0 20H
D0H R/W PSW C AC F0 RS1 RS0 OV −P 00H
D1H R/W GPR10 GPR107 GPR106 GPR105 GPR104 GPR103 GPR102 GPR101 GPR100 00H
D2H R/W TDACL TD7 TD6 TD5 TD4 TD3 TD2 TD1 TD0 00H
D3H R/W TDACH TPWE 1 TD13 TD12 TD11 TD10 TD9 TD8 40H
D4H R/W PWM7 PW7E 1 PW7V5 PW7V4 PW7V3 PW7V2 PW7V1 PW7V0 40H
D5H R/W PWM0 PW0E 1 PW0V5 PW0V4 PW0V3 PW0V2 PW0V1 PW0V0 40H
D6H R/W PWM1 PW1E 1 PW1V5 PW1V4 PW1V3 PW1V2 PW1V1 PW1V0 40H
D7H R CCDAT1 CCD17 CCD16 CCD15 CCD14 CCD13 CCD12 CCD11 CCD10 00H
D8H R/W S1CON CR2 ENSI STA STO SI AA CR1 CR0 00H
D9H R S1STA STAT4 STAT3 STAT2 STAT1 STAT0 0 0 0 F8H
DAH R/W S1DAT DAT7 DAT6 DAT5 DAT4 DAT3 DAT2 DAT1 DAT0 00H
DBH R/W S1ADR ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 GC 00H
DCH R/W PWM3 PW3E 1 PW3V5 PW3V4 PW3V3 PW3V2 PW3V1 PW3V0 40H
DDH R/W PWM4 PW4E 1 PW4V5 PW4V4 PW4V3 PW4V2 PW4V1 PW4V0 40H
DEH R/W PWM5 PW5E 1 PW5V5 PW5V4 PW5V3 PW5V2 PW5V1 PW5V0 40H
DFH R/W PWM6 PW6E 1 PW6V5 PW6V4 PW6V3 PW6V2 PW6V1 PW6V0 40H
E0H R/W ACC ACC7 ACC6 ACC5 ACC4 ACC3 ACC2 ACC1 ACC0 00H
E1H R/W TXT29 TEN B TS B1 TS B0 OSD
PLANES B OSD LANG
ENABLE B OSD LAN
B2 OSD LAN
B1 OSD LAN
B0 00H
E2H R/W TXT30 TC B2 TC B1 TC B0 reserved reserved reserved reserved reserved 00H
E3H R/W GPR11 GPR117 GPR116 GPR115 GPR114 GPR113 GPR112 GPR111 GPR110 00H
E4H R/W PWM2 PW2E 1 PW2V5 PW2V4 PW2V3 PW2V2 PW2V1 PW2V0 40H
E5H R/W GPR12 GPR127 GPR126 GPR125 GPR124 GPR123 GPR122 GPR121 GPR120 00H
E6H R/W GPR13 GPR137 GPR136 GPR135 GPR134 GPR133 GPR132 GPR131 GPR130 00H
E7H R CCDAT2 CCD27 CCD26 CCD25 CCD24 CCD23 CCD22 CCD21 CCD20 00H
ADD R/W NAME 7 6 5 4 3 2 1 0 RESET
2001 Feb 13 17
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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E8H R/W SAD VHI CH1 CH0 ST SAD7 SAD6 SAD5 SAD4 00H
E9H R/W GPR14 GPR147 GPR146 GPR145 GPR144 GPR143 GPR142 GPR141 GPR140 00H
EAH R/W GPR15 GPR157 GPR156 GPR155 GPR154 GPR153 GPR152 GPR151 GPR150 00H
EBH R/W GPR16 GPR167 GPR166 GPR165 GPR164 GPR163 GPR162 GPR161 GPR160 00H
ECH R/W GPR17 GPR177 GPR176 GPR175 GPR174 GPR173 GPR172 GPR171 GPR170 00H
EDH R/W GPR18 GPR187 GPR186 GPR185 GPR184 GPR183 GPR182 GPR181 GPR180 00H
EEH R/W TXT35 PKT1-247 PKT1-246 PKT1-245 PKT1-244 PKT1-243 PKT1-242 PKT1-241 PKT1-240 00H
EFH R/W TXT36 −−−−−−PKT1-249 PKT1-248 00H
F0H R/W B B7 B6 B5 B4 B3 B2 B1 B0 00H
F1H R/W T2CON TF2 EXF2 RCLK0 TCLK0 EXEN2 TR2 C/T2 CP/RL2 00H
F2H R/W T2MOD −−RCLK1 TCLK1 −T2RD T2OE DCEN 00H
F3H R/W RCAP2L RCAP2L7 RCAP2L6 RCAP2L5 RCAP2L4 RCAP2L3 RCAP2L2 RCAP2L1 RCAP2L0 00H
F4H R/W RCAP2H RCAP2H7 RCAP2H6 RCAP2H5 RCAP2H4 RCAP2H3 RCAP2H2 RCAP2H1 RCAP2H0 00H
F5H R/W TL2 TL27 TL26 TL25 TL24 TL23 TL22 TL21 TL20 00H
F6H R/W TH2 TH27 TH26 TH25 TH24 TH23 TH22 TH1 TH20 00H
F8H R/W TXT13 VPS
RECEIVED PAGE
CLEARING 525
DISPLAY 525 TEXT 625 TEXT PKT 8/30 FASTEXT 0 XXXX
XXX0
F9H R/W GPR19 GPR197 GPR196 GPR195 GPR194 GPR193 GPR192 GPR191 GPR190 00H
FAH R/W XRAMP XRAMP7 XRAMP6 XRAMP5 XRAMP4 XRAMP3 XRAMP2 XRAMP1 XRAMP0 00H
FBH R/W ROMBK STANDBY IIC_LUT1 IIC_LUT0 RAMBK1 RAMBK0 ROMBK2 ROMBK1 ROMBK0 00H
FCH R/W GPR20 GPR207 GPR206 GPR205 GPR204 GPR203 GPR202 GPR201 GPR200 00H
FDH R TEST TEST7 TEST6 TEST5 TEST4 TEST3 TEST2 TEST1 TEST0 00H
FEH W WDTKEY WKEY7 WKEY6 WKEY5 WKEY4 WKEY3 WKEY2 WKEY1 WKEY0 00H
FFH R/W WDT WDV7 WDV6 WDV5 WDV4 WDV3 WDV2 WDV1 WDV0 00H
ADD R/W NAME 7 6 5 4 3 2 1 0 RESET
2001 Feb 13 18
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Table 5 SFR bit description
BITS FUNCTION
Accumulator (ACC)
ACC7 to ACC0 accumulator value
B Register (B)
B7 to B0 B register value
CC Base Pointer (CCBASE)
CCBASE7 to CCBASE0 Closed Caption display base pointer
CC data byte 1 (CCDAT1)
CCD17 to CCD10 Closed Caption first data byte
CC data byte 2 (CCDAT2)
CCD26 to CCD20 Closed Caption second data byte
CC line (CCLIN)
CS4 to CS0 Closed Caption slice line using 525-line number
Data Pointer High byte (DPH)
DPH7 to DPH0 data pointer high byte, used with DPL to address auxiliary memory
Data Pointer Low byte (DPL)
DPL7 to DPL0 data pointer low byte, used with DPH to address auxiliary memory
External Interrupt (EXTINT) (n = 2 to 5)
EXnCFG<1:0> = 00 active LOW interrupt
EXnCFG<1:0> = 01 rising edge interrupt
EXnCFG<1:0> = 10 falling edge interrupt
EXnCFG<1:0> = 11 both rising and falling edge interrupt
General Purpose Registers (GPR1 to GPR20) (n = 1 to 21)
GPRn<7:0> general purpose read/write registers available for use by the embedded software
Interrupt Enable Register 0 (IEN0)
EA disable all interrupts (logic 0), or use individual interrupt enable bits (logic 1)
EBUSY enable BUSY interrupt
ES2 enable I2C-bus interrupt
ECC enable Closed Caption interrupt
ET1 enable Timer 1 interrupt
EX1 enable external interrupt 1
ET0 enable Timer 0 interrupt
EX0 enable external interrupt 0
2001 Feb 13 19
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Interrupt Enable Register 1 (IEN1)
EX5 enable external interrupt 5
EX4 enable external interrupt 4
EX3 enable external interrupt 3
EX2 enable external interrupt 2
EUTX enable UART transmitter interrupt
EURX enable UART receiver interrupt
EUART enable UART transmitter/receiver interrupt
ET2 enable Timer 2 interrupt
Interrupt Priority Register 0 (IP0)
PBUSY priority EBUSY interrupt
PES2 priority ES2 interrupt
PCC priority ECC interrupt
PT1 priority Timer 1 interrupt
PX1 priority external interrupt 1
PT0 priority Timer 0 interrupt
PX0 priority external interrupt 0
Interrupt Priority Register 1 (IP1)
PX5 priority external interrupt 5
PX4 priority external interrupt 4
PX3 priority external interrupt 3
PX2 priority external interrupt 2
PUTX priority UART transmitter interrupt
PURX priority UART receiver interrupt
PUART priority UART transmitter/receiver interrupt
PT2 priority Timer 2 interrupt
Port 0 (P0)
P07 to P00 Port 0 I/O register connected to external pins
Port 1 (P1)
P17 to P10 Port 1 I/O register connected to external pins
Port 2 (P2)
P27 to P20 Port 2 I/O register connected to external pins
Port 3 (P3)
P34 to P30 Port 3 I/O register connected to external pins
BITS FUNCTION
2001 Feb 13 20
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Port 0 Configuration A (P0CFGA) and Port 0 Configuration B (P0CFGB)
P0CFGA<7:0> and P0CFGB<7:0> These two registers are used to configure Port 0 lines. For example, the
configuration of Port 0 pin 3 is controlled by setting bit 3 in both P0CFGA and
P0CFGB. P0CFGB<x>/P0CFGA<x>:
00 = P0.x in Mode 0 (open-drain)
01 = P0.x in Mode 1 (quasi-bidirectional)
10 = P0.x in Mode 2 (high-impedance)
11 = P0.x in Mode 3 (push-pull)
Port 1 Configuration A (P1CFGA) and Port 1 Configuration B (P1CFGB)
P1CFGA<7:0> and P1CFGB<7:0> These two registers are used to configure Port 1 lines. For example, the
configuration of Port 1 pin 3 is controlled by setting bit 3 in both P1CFGA and
P1CFGB. P1CFGB<x>/P1CFGA<x>:
00 = P1.x in Mode 0 (open-drain)
01 = P1.x in Mode 1 (quasi-bidirectional)
10 = P1.x in Mode 2 (high-impedance)
11 = P1.x in Mode 3 (push-pull)
Port 2 Configuration A (P2CFGA) and Port 2 Configuration B (P2CFGB)
P2CFGA<7:0> and P2CFGB<7:0> These two registers are used to configure Port 2 lines. For example, the
configuration of Port 2 pin 3 is controlled by setting bit 3 in both P2CFGA and
P2CFGB. P2CFGB<x>/P2CFGA<x>:
00 = P2.x in Mode 0 (open-drain)
01 = P2.x in Mode 1 (quasi-bidirectional)
10 = P2.x in Mode 2 (high-impedance)
11 = P2.x in Mode 3 (push-pull)
Port 3 Configuration A (P3CFGA) and Port 3 Configuration B (P3CFGB)
P3CFGA<7:0> and P3CFGB<7:0> These two registers are used to configure Port 3 lines. For example, the
configuration of Port 3 pin 3 is controlled by setting bit 3 in both P3CFGA and
P3CFGB. P3CFGB<x>/P3CFGA<x>:
00 = P3.x in Mode 0 (open-drain)
01 = P3.x in Mode 1 (quasi-bidirectional)
10 = P3.x in Mode 2 (high-impedance)
11 = P3.x in Mode 3 (push-pull)
Power Control Register (PCON)
SMOD UART baud rate double control
ARD auxiliary RAM disable, all MOVX instructions access the external data memory
RFI disable ALE during internal access to reduce radio frequency Interference
WLE Watchdog Timer enable
GF1 general purpose flag
GF0 general purpose flag
PD Power-down activation bit
IDL Idle mode activation bit
BITS FUNCTION
2001 Feb 13 21
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Program Status Word (PSW)
C carry bit
AC auxiliary carry bit
F0 flag 0
RS1 to RS0 register bank selector bits RS<1:0>:
00 = Bank 0 (00H to 07H)
01 = Bank 1 (08H to 0FH)
10 = Bank 2 (10H to 17H)
11 = Bank 3 (18H to 1FH)
OV overflow flag
P parity bit
Pulse Width Modulator 0 Control Register (PWM0)
PW0E activate this PWM and take control of respective port pin (logic 1)
PW0V5 to PW0V0 pulse width modulator high time
Pulse Width Modulator 1 Control Register (PWM1)
PW1E activate this PWM (logic 1)
PW1V5 to PW1V0 pulse width modulator high time
Pulse Width Modulator 2 Control Register (PWM2)
PW2E activate this PWM (logic 1)
PW2V5 to PW2V0 pulse width modulator high time
Pulse Width Modulator 3 Control Register (PWM3)
PW3E activate this PWM (logic 1)
PW3V5 to PW3V0 pulse width modulator high time
Pulse Width Modulator 4 Control Register (PWM4)
PW4E activate this PWM (logic 1)
PW4V5 to PW4V0 pulse width modulator high time
Pulse Width Modulator 5 Control Register (PWM5)
PW5E activate this PWM (logic 1)
PW5V5 to PW5V0 pulse width modulator high time
Pulse Width Modulator 6 Control Register (PWM6)
PW6E activate this PWM (logic 1)
PW6V5 to PW6V0 pulse width modulator high time
Pulse Width Modulator 7 Control Register (PWM7)
PW7E activate this PWM (logic 1)
PW7V5 to PW7V0 pulse width modulator high time
Timer 2 Reload Capture High Byte (RCAP2H)
RCAP2H7 to RCAP2H0 Timer 2 capture/reload high byte
BITS FUNCTION
2001 Feb 13 22
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Timer 2 Reload Capture Low Byte (RCAP2L)
RCAP2L7 to RCAP2L0 Timer 2 capture/reload low byte
ROM Bank (ROMBK)
STANDBY standby activation bit
IIC_LUT1 to IIC_LUT0 I2C-bus lookup table selection; IIC_LUT<1:0>:
00 = P8xC558 normal mode
01 = P8xC558 fast mode
10 = P8xC558 slow mode
11 = reserved
RAMBK1 to RAMBK0 RAM Bank selection bits RAMBK<1:0>:
00 = Bank 0 (0 to 64 kbytes)
01 = Bank 1 (64 to 128 kbytes)
10 = Bank 2 (128 to 192 kbytes)
11 = Bank 3 (192 to 256 kbytes)
ROMBK2 to ROMBK0 ROM Bank selection bits ROMBK<2:0>:
000 = Bank 0 (32 to 64 kbytes)
001 = Bank 1 (64 to 96 kbytes)
010 = Bank 2 (96 to 128 kbytes)
011 = Bank 3 (128 to 160 kbytes)
100 = Bank 4 (160 to 192 kbytes)
101 to 111 = reserved
UART Buffer (S0BUF)
S0BUF7 to S0BUF0 UART data buffer
UART Control Register (S0CON)
SM0 to SM1 UART mode selection bits SM<0:1>:
00, Shift Register
01, 9-bit UART
10, 8-bit UART (variable baud rate)
11, 9-bit UART (variable baud rate)
SM2 Enables the multiprocessor communication feature in Modes 2 and 3. In
Mode 2 or 3, if SM2 is set, then RI will not be activated, RB8 and S0BUF will not
be loaded if the received 9th data bit is logic 0. In Mode 1, if SM2 is set, then RI
will not be activated, RB8 and S0BUF will not be loaded if no valid stop bit was
received. In Mode 0, SM2 has no influence.
REN Enables serial reception. Set by software to enable reception. Cleared by
software to disable reception.
TB8 Is the 9th data bit that will be transmitted in Modes 2 and 3. Set or cleared by
software as desired.
RB8 In Modes 2 and 3, RB8 is the 9th data bit that was received. In Mode 1, if SM2 is
logic 0, RB8 is the stop bit that was received. In Mode 0, RB8 is not used.
Loading of RB8 in Modes 1, 2 and 3 depends on SM2.
BITS FUNCTION
2001 Feb 13 23
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
TI Is the transmit interrupt flag. Set by hardware at the end of the 8th bit time in
Mode 0, or at the beginning of the stop bit in the other modes. Must be cleared
by software.
RI Is the receive interrupt flag. Set by hardware at the end of the 8th bit time in
Mode 0, or halfway through the stop bit time in the other modes, in any serial
reception (except see SM2). Must be cleared by software.
I2C-bus Slave Address Register (S1ADR)
ADR6 to ADR0 I2C-bus slave address to which the device will respond
GC enable I2C-bus general call address (logic 1)
I2C-bus Control Register (S1CON)
CR2 to CR0 clock rate bits; CR<2:0>: (for nominal mode)
000 = 200 kHz bit rate
001 = 7.5 kHz bit rate
010 = 300 kHz bit rate
011 = 400 kHz bit rate
100 = 50 kHz bit rate
101 = 3.75 kHz bit rate
110 = 75 kHz bit rate
111 = 100 kHz bit rate
ENSI enable I2C-bus interface (logic 1)
STA START flag. When this bit is set in slave mode, the hardware checks the I2C-bus
and generates a START condition if the bus is free or after the bus becomes free.
If the device operates in master mode, it will generate a repeated START
condition.
STO STOP flag. If this bit is set in a master mode, a STOP condition is generated. A
STOP condition detected on the I2C-bus clears this bit. This bit may also be set
in slave mode, to recover from an error condition. In this case, no STOP
condition is generated to the I2C-bus, but the hardware releases the SDA and
SCL lines and switches to the not selected receiver mode. The STOP flag is
cleared by the hardware.
SI Serial Interrupt flag. This flag is set and an interrupt request is generated, after
any of the following events occur:
•A START condition is generated in master mode
•The own slave address has been received during AA = 1
•The general call address has been received while S1ADR.GC and AA = 1
•Adata byte hasbeenreceived ortransmittedinmaster mode(evenif arbitration
is lost)
•A data byte has been received or transmitted as selected slave
•A STOP or START condition is received as selected slave receiver or
transmitter. While the SI flag is set, SCL remains LOW and the serial transfer is
suspended. SI must be reset by software.
BITS FUNCTION
2001 Feb 13 24
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
AA Assert Acknowledge flag. When this bit is set, an acknowledge is returned
after any one of the following conditions:
•Own slave address is received
•General call address is received (S1ADR.GC = 1)
•A data byte is received, while the device is programmed to be a master receiver
•A data byte is received, while the device is selected slave receiver.
When the bit is reset, no acknowledge is returned. Consequently, no interrupt is
requested when the own address or general call address is received.
I2C-bus Data Register (S1DAT)
DAT7 to DAT0 I2C-bus data
I2C-bus Status Register (S1STA)
STAT4 to STAT0 I2C-bus interface status
Software ADC Register (SAD)
VHI analog input voltage greater than DAC voltage (logic 1)
CH1 to CH0 ADC input channel select bits; CH<1:0>:
00 = ADC3
01 = ADC0
10 = ADC1
11 = ADC2
ST(1) initiate voltage comparison between ADC input channel and SAD value
SAD7 to SAD4 4 MSBs of DAC input word
Software ADC Control Register (SADB)
DC_COMP enable DC comparator mode (logic 1)
SAD3 to SAD0 4 LSBs of SAD value
Stack Pointer (SP)
SP7 to SP0 stack pointer value
Timer/counter Control Register (TCON)
TF1 Timer 1 overflow flag. Set by hardware on Timer/counter overflow. Cleared by
hardware when processor vectors to interrupt routine.
TR1 Timer 1 run control bit. Set/cleared by software to turn Timer/counter on/off.
TF0 Timer 0 overflow flag. Set by hardware on Timer/counter overflow. Cleared by
hardware when processor vectors to interrupt routine.
TR0 Timer 0 run control bit. Set/cleared by software to turn Timer/counter on/off.
IE1 Interrupt 1 edge flag. Both edges generate flag. Set by hardware when external
interrupt edge detected. Cleared by hardware when interrupt processed.
IT1 Interrupt 1 type control bit. Set/cleared by software to specify edge/low level
triggered external interrupts.
IE0 Interrupt 0 Edge l flag. Set by hardware when external interrupt edge detected.
Cleared by hardware when interrupt processed.
IT0 Interrupt 0 type flag. Set/cleared by software to specify falling edge/low level
triggered external interrupts.
BITS FUNCTION
2001 Feb 13 25
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Timer/counter2 Control Register (T2CON)
TF2 Timer 2 overflow flag. Cleared by software. TF2 will not be set when either
baud rate generation mode or clock out mode.
EXF2 Timer 2 External Flag. Set on a negative transition on T2EX and EXEN2 = 1. In
Auto-reload mode it is toggled on an under or overflow. Cleared by software.
RCLK0 Receive clock 0 flag. When set, causes the UART to use Timer 2 overflow
pulses. RCLK0 = 0 causes Timer 1 overflow pulses to be used.
TCLK0 Transmit clock 0 flag. When set, causes the UART to use Timer 2 overflow
pulses. TCLK0 = 0 causes Timer 1 overflow pulses to be used.
EXEN2 Timer 2 external enable flag. When set, allows a capture or reload to occur,
together with an interrupt, as a result of a negative transition on input T2EX if in
capture mode or Auto-reload mode with DCEN reset. If in Auto-reload mode and
DCEN is set, this bit has no influence. In the other modes, EXF2 is set and an
interrupt is generated on a HIGH-to-LOW transition on T2EX pin. In all modes,
EXEN2 = 0 causes Timer 2 to ignore events at T2EX.
TR2 START/STOP control bit. A logic 1 starts Timer 2.
C/T2 Counter Timer selection bit. A logic 1 selects the counter for Timer 2.
CP/RL2 Capture/Reload flag. Selection of mode capture or reload.
14-bit PWM MSB Register (TDACH)
TPWE activate this 14-bit PWM (logic 1)
TD13 to TD8 6 MSBs of 14-bit number to be output by the 14-bit PWM
14-bit PWM LSB Register (TDACL)
TD7 to TD0 8 LSBs of 14-bit number to be output by the 14-bit PWM
Timer 0 High byte (TH0)
TH07 to TH00 8 MSBs of Timer 0 16-bit counter
Timer 1 High byte (TH1)
TH17 to TH10 8 MSBs of Timer 1 16-bit counter
Timer 2 High byte (TH2)
TH27 to TH20 8 MSBs of Timer 2 16-bit counter
Timer 0 Low byte (TL0)
TL07 to TL00 8 LSBs of Timer 0 16-bit counter
Timer 1 Low byte (TL1)
TL17 to TL10 8 LSBs of Timer 1 16-bit counter
Timer 2 Low byte (TL2)
TL27 to TL20 8 LSBs of Timer 2 16-bit counter
BITS FUNCTION
2001 Feb 13 26
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Timer/counter Mode Control (TMOD)
GATE gating control Timer/counter 1
C/T Counter/Timer 1 selector
M1 to M0 mode control bits Timer/counter 1; M<1:0>:
00 = 8-bit Timer or 8-bit Counter with divide-by-32 prescaler
01 = 16-bit time interval or event Counter
10 = 8-bit time interval or event Counter with automatic reload upon overflow;
reload value stored in TH1
11 = stopped
GATE gating control Timer/counter 0
C/T Counter/Timer 0 selector
M1 to M0 mode control bits Timer/counter 0; M<1:0>:
00 = 8-bit timer or 8-bit counter with divide-by-32 prescaler
01 = 16-bit time interval or event Counter
10 = 8-bit time interval or event Counter with automatic reload upon overflow;
reload value stored in TH0
11 = one 8-bit time interval or event Counter and one 8-bit time interval Counter
Timer 2 Mode Control (T2MOD)
RCLK1 Receive clock 1 flag. When set, causes the UART to use Timer 2 overflow
pulses. RCLK1 = 0 causes Timer 1 overflow pulses to be used.
TCLK1 Transmit clock 1 flag. When set, causes the UART to use Timer 2 overflow
pulses. TCLK1 = 0 causes Timer 1 overflow pulses to be used.
T2RD Timer 2 Read flag. This bit is set by hardware if following TL2 read and before
TH2 read, TH2 is incremented. It is reset on the trailing edge of next TL2 read.
T2OE Timer 2 output enable bit. When set, pin T2 is configured as a clock output.
DCEN Down count enable flag. When set, this allows Timer 2 to be configured as an
up/down Counter.
Text Register 0 (TXT0)
X24 POSN store packet 24 in extension packet memory (logic 0) or page memory (logic 1)
DISPLAY X24 display X24 from page memory (logic 0) or extension packet memory (logic 1)
AUTO FRAME FRAME output switched off automatically if any video displayed (logic 1)
DISABLE HEADER ROLL disable writing of rolling headers and time into memory (logic 1)
DISPLAY STATUS ROW ONLY display row 24 only (logic 1)
DISABLE FRAME FRAME output always LOW (logic 1)
VPS ON enable capture of VPS data (logic 1)
INV ON enable capture of inventory page in block 8 (logic 1)
BITS FUNCTION
2001 Feb 13 27
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 1 (TXT1)
EXT PKT OFF disable acquisition of extension packets (logic 1)
8-BIT disable checking of packets 0 to 24 written into memory (logic 1)
ACQ OFF disable writing of data into Display memory (logic 1)
X26 OFF disable automatic processing of X/26 data (logic 1)
FULL FIELD acquire data on any TV line (logic 1)
FIELD POLARITY VSYNC pulse in second half of line during even field (logic 1)
H POLARITY HSYNC reference edge is negative going (logic 1)
V POLARITY VSYNC reference edge is negative going (logic 1)
Text Register 2 (TXT2)
ACQ BANK select acquisition Bank 1 (logic 1)
REQ3 to REQ0 page request
SC2 to SC0 start column of page request
Text Register 3 (TXT3)
PRD4 to PRD0 page request data
Text Register 4 (TXT4)
OSD BANK ENABLE alternate OSD location available via graphic attribute, additional 32 locations
(logic 1)
QUAD WIDTH ENABLE enable display of quadruple width characters (logic 1)
EAST/WEST eastern language selection of character codes A0H to FFH (logic 1)
DISABLE DOUBLE HEIGHT disable normal decoding of double height characters (logic 1)
B MESH ENABLE enable meshing of black background (logic 1)
C MESH ENABLE enable meshing of coloured background (logic 1)
TRANS ENABLE display black background as video (logic 1)
SHADOW ENABLE display shadow/fringe (default SE black) (logic 1)
Text Register 5 (TXT5)
BKGND OUT background colour displayed outside Teletext boxes (logic 1)
BKGND IN background colour displayed inside Teletext boxes (logic 1)
COR OUT COR active outside Teletext and OSD boxes (logic 1)
COR IN COR active inside Teletext and OSD boxes (logic 1)
TEXT OUT TEXT displayed outside Teletext boxes (logic 1)
TEXT IN TEXT displayed inside Teletext boxes (logic 1)
PICTURE ON OUT VIDEO displayed outside Teletext boxes (logic 1)
PICTURE ON IN VIDEO displayed inside Teletext boxes (logic 1)
BITS FUNCTION
2001 Feb 13 28
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 6 (TXT6)
BKGND OUT background colour displayed outside Teletext boxes (logic 1)
BKGND IN background colour displayed inside Teletext boxes (logic 1)
COR OUT COR active outside Teletext and OSD boxes (logic 1)
COR IN COR active inside Teletext and OSD boxes (logic 1)
TEXT OUT TEXT displayed outside Teletext boxes (logic 1)
TEXT IN TEXT displayed inside Teletext boxes (logic 1)
PICTURE ON OUT VIDEO displayed outside Teletext boxes (logic 1)
PICTURE ON IN VIDEO displayed inside Teletext boxes (logic 1)
Text Register 7 (TXT7)
STATUS ROW TOP Display memory row 24 information above Teletext page (on display row 0)
(logic 1)
CURSOR ON display cursor at position given by TXT9 and TXT10 (logic 1)
REVEAL display characters in area with conceal attribute set (logic 1)
BOTTOM/TOP Display memory rows 12 to 23 when DOUBLE HEIGHT height bit is set (logic 1)
DOUBLE HEIGHT display each character as twice normal height (logic 1)
BOX ON 24 enable display of Teletext boxes in memory row 24 (logic 1)
BOX ON 1 to 23 enable display of Teletext boxes in memory row 1 to 23 (logic 1)
BOX ON 0 enable display of Teletext boxes in memory row 0 (logic 1)
Text Register 8 (TXT8)
FLICKER STOP ON disable ‘Flicker Stopper’ circuit (logic 1)
DISABLE SPANISH disable special treatment of Spanish packet 26 characters (logic 1)
PKT 26 RECEIVED(2) packet 26 data has been processed (logic 1)
WSS RECEIVED(2) WSS data has been processed (logic 1)
WSS ON enable acquisition of WSS data (logic 1)
CVBS1/CVBS0 select CVBS1 as source for device (logic 1)
Text Register 9 (TXT9)
CURSOR FREEZE lock cursor at current position (logic 1)
CLEAR MEMORY(1) clear memory block pointed to by TXT15 (logic 1)
A0 access extension packet memory (logic 1)
R4 to R0(3) current memory ROW value
Text Register 10 (TXT10)
C5 to C0(4) current memory COLUMN value
Text Register 11 (TXT11)
D7 to D0 data value written or read from memory location defined by TXT9, TXT10 and
TXT15
BITS FUNCTION
2001 Feb 13 29
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 12 (TXT12)
525/625 SYNC 525-line CVBS signal is being received (logic 1)
SPANISH Spanish character set present (logic 1)
ROM VER3 to ROM VER0 mask programmable identification for character set
VIDEO SIGNAL QUALITY acquisition can be synchronized to CVBS (logic 1)
Text Register 13 (TXT13)
VPS RECEIVED VPS data (logic 1)
PAGE CLEARING software or power-on page clear in progress (logic 1)
525 DISPLAY 525-line synchronisation for display (logic 1)
525 TEXT 525-line WST being received (logic 1)
625 TEXT 625-line WST being received (logic 1)
PKT 8/30 packet 8/30/x(625) or packet 4/30/x(525) data detected (logic 1)
FASTEXT packet x/27 data detected (logic 1)
Text Register 14 (TXT14)
DISPLAY BANK upper bank for display selected (logic 1)
PAGE3 to PAGE0 current display page
Text Register 15 (TXT15)
MICRO BANK upper bank for micro selected (logic 1)
BLOCK3 to BLOCK0 current micro block to be accessed by TXT9, TXT10 and TXT11
Text Register 17 (TXT17)
FORCE ACQ1 to FORCE ACQ0 FORCE ACQ<1:0>:
00 = automatic selection
01 = force 525 timing, force 525 Teletext standard
10 = force 625 timing, force 625 Teletext standard
11 = force 625 timing, force 525 Teletext standard
FORCE DISP1 to FORCE DISP0 FORCE DISP<1:0>:
00 = automatic selection
01 = force display to 525 mode (9 lines per row)
10 = force display to 625 mode (10 lines per row)
11 = not valid (default to 625)
SCREEN COL2 to SCREEN COL0 Defines colour to be displayed instead of TV picture and black background; these
bits <2:0> are equivalent to the RGB components. SCREEN COL<2:0>:
000 = transparent
001 = CLUT entry 9
010 = CLUT entry 10
011 = CLUT entry 11
100 = CLUT entry 12
101 = CLUT entry 13
110 = CLUT entry 14
111 = CLUT entry 15
BITS FUNCTION
2001 Feb 13 30
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 18 (TXT18)
NOT3 to NOT0 National Option Table selection, maximum of 31 when used with EAST/WEST bit
BS1 to BS0 basic character set selection
Text Register 19 (TXT19)
TEN enable twist character set (logic 1)
TC2 to TC0 language control bits (C12/C13/C14) that has twisted character set
TS1 to TS0 twist character set selection
Text Register 20 (TXT20)
DRCS ENABLE re-map column 8/9 to DRCS (TXT and CC modes) (logic 1)
OSD PLANES character code columns 8 and 9 defined as double plane characters (special
graphics characters) (logic 1)
EXTENDED SPECIAL GRAPHICS extended Special Graphics disabled (columns 8 and 9 only used for special
graphics characters) (logic 0)
extended Special Graphics enabled (user definable range for special graphics
characters) (logic 1)
CHAR SELECT ENABLE enables character set selection in CC display mode (logic 1)
OSD LANG ENABLE enable use of OSD LAN<2:0> to define language option for display, instead of
C12/C13/C14
OSD LAN2 to OSD LAN0 alternative C12/C13/C14 bits for use with OSD menus
Text Register 21 (TXT21)
DISP LINES1 to DISP LINES0 the number of display lines per character row; DISP LINES<1:0>:
00 = 10 lines per character (defaults to 9 lines in 525 mode)
01 = 13 lines per character
10 = 16 lines per character
11 = reserved
CHAR SIZE1 to CHAR SIZE0 character matrix size bits; CHAR SIZE<1:0>:
00 = 10 lines per character (matrix 12 ×10)
01 = 13 lines per character (matrix 12 ×13)
10 = 16 lines per character (matrix 12 ×16)
11 = reserved
I2C Port 1 enable I2C-bus Port 1 selection (P1.5/SDA1 and P1.4/SCL1) (logic 1)
CCON Closed Caption acquisition on (logic 1)
I2C Port 0 enable I2C-bus Port 0 selection (P1.7/SDA0 and P1.6/SCL0) (logic 1)
CC/TXT display configured for CC mode (logic 1)
BITS FUNCTION
2001 Feb 13 31
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 22 (TXT22)
GPF7 to GPF6 reserved
GPF5 to GPF4 and GPF2 to GPF0 general purpose register, bits defined by mask programmable bits
(Character ROM address 09FEH)
GPF3 PWM0, PWM1, PWM2 and PWM3 output on Port 3.0 to Port 3.3 respectively
(logic 0)
PWM0, PWM1, PWM2 and PWM3 output on Port 2.1 to Port 2.4 respectively
(logic 1)
Text Register 23 (TXT23)
NOT B3 to NOT B0 National Option Table selection for Page B, maximum of 32 when used with
EAST/WEST B bit
EAST/WEST B eastern language selection of character codes A0H to FFH for Page B (logic 1)
DRCS B ENABLE normal OSD characters used on Page B (logic 0)
re-map column 8/9 to DRCS (TXT and CC modes) on Page B (logic 1)
BS B1 to BS B0 basic character set selection for Page B
Text Register 24 (TXT24)
BKGND OUT B background colour displayed outside Teletext boxes (Teletext page) (logic 1)
BKGND IN B background colour displayed inside Teletext boxes (Teletext page) (logic 1)
COR OUT B COR active outside Teletext and OSD boxes (Teletext page) (logic 1)
COR IN B COR active inside Teletext and OSD boxes (Teletext page) (logic 1)
TEXT OUT B TEXT displayed outside Teletext boxes (Teletext page) (logic 1)
TEXT IN B TEXT displayed inside Teletext boxes (Teletext page) (logic 1)
PICTURE ON OUT B VIDEO displayed outside Teletext boxes (Teletext page) (logic 1)
PICTURE ON IN B VIDEO displayed inside Teletext boxes (Teletext page) (logic 1)
Text Register 25 (TXT25)
BKGND OUT B background colour displayed outside Teletext boxes (Sub-Title/Newsflash page)
(logic 1)
BKGND IN B background colour displayed inside Teletext boxes (Sub-Title/Newsflash page)
(logic 1)
COR OUT B COR active outside Teletext and OSD boxes (Sub-Title/Newsflash page) (logic 1)
COR IN B COR active inside Teletext and OSD boxes (Sub-Title/Newsflash page) (logic 1)
TEXT OUT B TEXT displayed outside Teletext boxes (Sub-Title/Newsflash page) (logic 1)
TEXT IN B TEXT displayed inside Teletext boxes (Sub-Title/Newsflash page) (logic 1)
PICTURE ON OUT B VIDEO displayed outside Teletext boxes (Sub-Title/Newsflash page) (logic 1)
PICTURE ON IN B VIDEO displayed inside Teletext boxes (Sub-Title/Newsflash page) (logic 1)
BITS FUNCTION
2001 Feb 13 32
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 26 (TXT26)
EXTENDED DRCS columns 8/9 mapped to DRCS when DRCS characters enabled
(32 DRCS characters) (logic 0)
columns 8/9/A/C mapped to DRCS when DRCS characters enabled (64 DRCS
characters) (logic 1)
TRANS ENABLE B display black background as video on Page B (logic 1)
C MESH ENABLE B enable meshing of coloured background on Page B (logic 1)
B MESH ENABLE B enable meshing of black background on Page B (logic 1)
SHADOW ENABLE B disable display of shadow/fringing on Page B (logic 0)
display shadow/ fringe (default SE black) on Page B (logic 1)
BOX ON 24 B enable display of Teletext boxes in memory row 24 of Page B (logic 1)
BOX ON 1 B to 23 B enable display of Teletext boxes in memory row 1 to 23 of Page B (logic 1)
BOX ON 0 B enable display of Teletext boxes in memory row 0 of Page B (logic 1)
Text Register 27 (TXT27)
SCRB2 to SCRB0 Defines colour to be displayed instead of TV picture and black background for
Page B; these bits are equivalent to the RGB components. SCRB<2:0>:
000 = transparent
001 = CLUT entry 9
010 = CLUT entry 10
011 = CLUT entry 11
100 = CLUT entry 12
101 = CLUT entry 13
110 = CLUT entry 14
111 = CLUT entry 15
Text Register 28 (TXT28)
MULTI-PAGE conventional internal memory storage of acquisition data (logic 0)
enables multi-page acquisition operation for software controlled storage of
acquired data in external SRAM (logic 1)
CC/TXT B display Page B configured for CC mode (logic 1)
ACTIVE PAGE display Page B active during two page mode (logic 1)
DISPLAY BANK B select upper bank for display Page B (logic 1)
PAGE B3 to PAGE B0 current display page for Page B
BITS FUNCTION
2001 Feb 13 33
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Text Register 29 (TXT29)
TEN B disable twist function for Page B (logic 0)
enable twist character set for Page B (logic 1)
TS B1 to TS B0 twist character set selection for Page B
OSD PLANES B character code columns 8 and 9 defined as single plane characters for display
Page B (logic 0)
character code columns 8 and 9 defined as double plane characters (special
graphics characters) for display Page B (logic 1)
OSD LANG ENABLE B enable use of OSD LAN B<2:0> to define language option for display, instead of
C12/C13/C14 for display Page B
OSD LAN B2 to OSD LAN B0 alternative C12/C13/C14 bits for use with OSD menus for display Page B
Text Register 30 (TXT30)
TC B2 to TC B0 language control bits (C12/C13/C14) that has twist character set for Page B
BOTTOM/TOP B Display memory rows 0 to 11 when double height bit is set on display Page B
(logic 0)
Display memory rows 12 to 23 when double height bit is set on display Page B
(logic 1)
DOUBLE HEIGHT B display each character as twice normal height on display Page B (logic 1)
STATUS ROW TOP B Display memory row 24 information below Teletext page (on display row 24) on
display Page B (logic 0).
Display memory row 24 information above Teletext page (on display row 0) on
display Page B (logic 1).
DISPLAY X24 B display row 24 from basic page memory on display Page B (logic 0)
display row 24 from appropriate location in extension memory on display Page B
(logic 1)
DISPLAY STATUS ROW ONLY B display only row 24 on display Page B (logic 1)
Text Register 31 (TXT31)
GPF11 to GPF10 general purpose register, bits defined by mask programmable location
(Character ROM address 09FEH)
GPF9 to GPF8 00 = reserved
01 = 80C51 configured for 12 MHz operation
10 = reserved
11 = reserved
Text Register 32 (TXT32)
9FE11 reserved
9FF11 to 9FF5 mask programmable bits available for UOC configuration (Character ROM
address 09FFH)
Text Register 33 (TXT33)
BFE7 to BFE0 mask programmable bits available for UOC configuration (Character ROM
address 0BFEH)
Text Register 34 (TXT34)
BFE11 to BFE8 mask programmable bits available for UOC configuration (Character ROM
address 0BFEH)
BITS FUNCTION
2001 Feb 13 34
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Notes
1. This flag is set by software and reset by hardware.
2. This flag is set by hardware and must be reset by software.
3. Valid range TXT Mode 0 to 24.
4. Valid range TXT Mode 0 to 39.
5. Must be set to 55H to disable Watchdog Timer when active.
Text Register 35 (TXT35)
PKT1-24<7:0> Teletext Packets 1-24 received for blocks 7 to 0, set by hardware and cleared by
software. Teletext Packets 1-24 received after a header in any one Vertical
Blanking Interval (VBI) (logic 1)
Text Register 36 (TXT36)
PKT1-24<9:8> Teletext Packets 1-24 received for blocks 9 to 8, set by hardware and cleared by
software. Teletext Packets 1-24 received after a header in any one VBI (logic 1)
Watchdog Timer (WDT)
WDV7 to WDV0 Watchdog Timer period
Watchdog Timer Key (WDTKEY)
WKEY7 to WKEY0(5) Watchdog Timer key
Wide Screen Signalling 1 (WSS1)
WSS<3:0> ERROR error in WSS<3:0> (logic 1)
WSS3 to WSS0 signalling bits to define aspect ratio (group 1)
Wide Screen Signalling 2 (WSS2)
WSS<7:4> ERROR error in WSS<7:4> (logic 1)
WSS7 to WSS4 signalling bits to define enhanced services (group 2)
Wide Screen Signalling 3 (WSS3)
WSS<13:11> ERROR error in WSS<13:11> (logic 1)
WSS13 to WSS11 signalling bits to define reserved elements (group 4)
WSS<10:8> ERROR error in WSS<10:8> (logic 1)
WSS10 to WSS8 signalling bits to define subtitles (group 3)
External RAM Pointer (XRAMP)
XRAMP7 to XRAMP0 Upper address byte for MOVX RAM space in direct addressing. To use with one
of the R0 to R7 registers to provide the lower address byte.
BITS FUNCTION
2001 Feb 13 35
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
8.6 Character set feature bits
Features available on the SAA56xx devices are reflected in a specific area of the Character ROM. These sections of the
Character ROM are mapped to two Special Function Registers: TXT22 and TXT12. Character ROM address 09FEH is
mapped to SFR TXT22, as shown in Table 6 and described in Table 7. Character ROM address 09FFH is mapped to
SFR TXT12, as shown in Table 8 and described in Table 9.
Table 6 Character ROM - TXT22 mapping
Table 7 Description of Character ROM address 09FEH bits
Table 8 Character ROM - TXT12 mapping
Table 9 Description of Character ROM address 09FFH bits
MAPPED ITEMS 11 10 9 8 7 6 5 4 3 2 1 0
Character ROM;
address 09FEH XXXXXXXXUXXX
Mapped to TXT22 −−−−76543210
U = Used, X = Reserved
BIT FUNCTION
0 to 2 reserved
3 1 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 2.1 to Port 2.4 respectively
0 = PWM0, PWM1, PWM2 and PWM3 output routed to Port 3.0 to Port 3.3 respectively
4 to 11 reserved
MAPPED ITEMS 11 10 9 8 7 6 5 4 3 2 1 0
Character ROM;
address 09FFH XXXXXXXUXXXX
Mapped to TXT12 −−−−−−−65432
U = Used, X = Reserved
BIT FUNCTION
4 1 = Spanish character set present
0 = no Spanish character set present
0 to 3, 5 to 11 reserved
2001 Feb 13 36
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
8.7 MOVX memory
The normal 80C51 external memory area has been
mapped internally to the device (see Fig.8). This means
that the MOVX instruction accesses memory internal to
the device.
8.7.1 MOVX SPACE PAGE SELECTION
The MOVX RAM page pointer is used to select one of the
256 pages within the MOVX address space, not all pages
are allocated, refer to Fig.9 for further detail. A page
consists of 256 consecutive bytes. XRAMP only works
with internal MOVX memory.
handbook, full pagewidth
GSA021
DYNAMICALLY
REDEFINABLE
CHARACTERS
DISPLAY RAM
FOR
CLOSED CAPTION (4) address range 8460H to 84FFH
"Additional Internal Data RAM"
upper 32 kbyteslower 32 kbytes
DISPLAY REGISTERS
8FFFH
9000H
FFFFH
8800H
87FFH
87E0H
CLUT
871FH
8700H
845FH
8000H
DISPLAY RAM
FOR
TEXT PAGES (1)
DATA RAM (2)
6FFFH
7000H
7FFFH
2000H
1FFFH
0800H
07FFH
0000H (3)
Fig.8 MOVX RAM allocation.
(1) Both SAA56xx 128 and 192 kbytes have 12 kbytes of Display memory.
(2) 0800H to 1FFFH are mapped into 6 kbytes of Bank 0 of external RAM.
An external RAM is required to be able to address this memory space (refer to Section 20 and Section 30.2).
(3) Both SAA56xx 128 and 192 kbytes have 2 kbytes of Data RAM.
(4) Display RAM for Closed Caption and Text is shared.
2001 Feb 13 37
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
GSA070
XRAMP SFR = 00H
FFH
00H
XRAMP SFR = 01H
FFH
00H
0000H
00FFH
0100H
01FFH
XRAMP SFR = FEH
MOVX @ DPTR,A
MOVX A, @ DPTR
MOVX @ Ri,A
MOVX A, @ Ri
FFH
00H 0800H
08FFH
Allocated(1)
Allocated(1)
Not Allocated
Not Allocated
XRAMP SFR = FFH
FFH
00H 2000H
20FFH
XRAMP SFR = FFH
FFH
00H 4000H
4FFFH
XRAMP SFR = FFH
FFH
00H FF00H
FFFFH
Fig.9 Indirect addressing of MOVX RAM.
(1) Internal 14-kbyte data and display RAM of the device.
9 POWER-ON RESET
Tworesetinputs are presentonthedevice, the RESET pin
beingactive HIGHandRESETpinbeing activeLOW.Only
one of these inputs need be connected in the system as
they are ORed internally to the device and each pin has
the necessary pull-down (for RESET) and pull-up (for
RESET) resistors at the pad.
An automatic reset can be obtained when VDD is switched
on by connecting the RESET pin to VDDP through a
10 µF capacitor, providing the VDD rise time does not
exceed 1 ms, and the oscillator start-up time does not
exceed 10 ms.
Alternatively,a capacitorconnectedtoVSSP with asuitable
pull-up to VDDP, (e.g. 10 µF capacitor; 16 kΩresistor) can
be connected to the RESET pin.
To ensure correct initialisation, the RESET/RESET pin
must be held HIGH/LOW long enough for the oscillator to
settle following power-up, usually a few milliseconds
(application specific, typically 10 ms). Once the oscillator
is stable, a further 24 crystal clocks are required to
generate the reset. Once the above reset condition has
been detected, an internal reset signal is triggered (which
remains active for 2048 clock cycles).
2001 Feb 13 38
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
10 POWER SAVING MODES OF OPERATION
Three power saving modes are incorporated in the
SAA56xx device: Standby, Idle and Power-down. When
utilizing one of these modes, power to the device (VDDP,
VDDC andVDDA)should bemaintained,since power saving
is achieved by clock gating on a section-by-section basis.
10.1 Standby mode
During Standby mode, the Acquisition and Display
sections of the device are disabled. The following
functions remain active:
•80C51 CPU Core
•Memory interface
•I2C-bus interface
•Timer/counters
•Watchdog Timer
•UART, SAD, PWMs.
To enter Standby mode, the STANDBY bit in the
ROMBK register must be set. Once in Standby, the crystal
oscillator continues to run, but the internal clocks to
AcquisitionandDisplayaregatedout. However,the clocks
to the 80C51 CPU Core, Memory Interface, I2C-bus,
UART, Timer/counters, Watchdog Timer and Pulse Width
Modulators are maintained. Since the output values on
RGB and VDS are maintained, the display output must be
disabled before entering this mode.
The Standby mode may be used in conjunction with both
Idle and Power-down modes. Hence, prior to entering
either Idle or Power-down, the STANDBY bit may be set,
thusallowingwake-upofthe 80C51 CPU core without fully
waking the entire device. (This enables detection of a
Remote Control source in a power saving mode.)
10.2 Idle mode
During Idle mode, Acquisition, Display and the
CPU sections of the device are disabled. The following
functions remain active:
•Memory interface
•I2C-bus interface
•Timer/counters
•Watchdog Timer
•UART, SAD, PWMs.
To enter Idle mode, bit IDL in the PCON register must be
set. The Watchdog Timer must be disabled prior to
entering Idle to prevent the device being reset.
Once in Idle mode, the crystal oscillator continues to run,
but the internal clock to the CPU, Acquisition and Display
are gated out. However, the clocks to the Memory
Interface, I2C-bus, Timer/counters, Watchdog Timer and
Pulse Width Modulators are maintained. The CPU state is
frozen along with the status of all SFRs. Internal
RAM contentsaremaintained,asarethedeviceoutput pin
values. Since the output values on RGB and VDS are
maintained, the Display output must be disabled before
entering this mode.
There are three methods available to recover from Idle:
•Assertion of an enabled interrupt will cause bit IDL to be
cleared by hardware, thus terminating Idle mode. The
interrupt is serviced and, following the instruction RETI,
the next instruction to be executed will be the one after
the instruction that put the device into Idle mode.
•A second method of exiting Idle is via an interrupt
generated by the SAD DC Compare circuit. When the
SAA56xx is configured in this mode, detection of an
analog threshold at the input to the SAD may be used to
trigger wake-up of the device i.e. TV Front Panel
Key-press. As above, the interrupt is serviced, and
following the instruction RETI, the next instruction to be
executedwillbe theonefollowingthe instruction thatput
the device into Idle.
•The third method of terminating Idle mode is with an
external hardware reset. Since the oscillator is running,
the hardware reset need only be active for 24 crystal
clocksat12 MHzto complete the reset operation. Reset
defines all SFRs and Display memory to a pre-defined
state, but maintains all other RAM values. Code
execution commences with the Program Counter set to
‘0000’.
10.3 Power-down mode
InPower-downmode, the crystal oscillator isstopped.The
contents of all SFRs and Data memory are maintained,
however,thecontentsoftheAuxiliary/Displaymemoryare
lost. The port pins maintain the values defined by their
associated SFRs. Since the output values on RGB and
VDS are maintained, the Display output must be made
inactive before entering Power-down mode.
ThePower-down mode is activated by setting bit PD in the
PCON register. It is advisable to disable the Watchdog
Timer prior to entering Power-down. Recovery from
Power-down takes several milliseconds as the oscillator
must be given time to stabilize.
2001 Feb 13 39
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
There are three methods of exiting Power-down:
•External interrupt. Since the clock is stopped, an
external interrupt needs to be set level sensitive prior to
entering Power-down. The interrupt is serviced and,
following the instruction RETI, the next instruction to be
executed will be the one after the instruction that put the
device into Power-down mode.
•Interrupt generated by the SAD DC Compare circuit.
When SAA56xx is configured in this mode, detection of
a certain analog threshold at the input to the SAD may
be used to trigger wake-up of the device, i.e. TV Front
Panel Key-press. As above, the interrupt is serviced
and, following the instruction RETI, the next instruction
to be executed will be the one following the instruction
that put the device into Power-down.
•External hardware reset. This reset defines all SFRs
and Display memory, but maintains all other RAM
values. Code execution commences with the Program
Counter set to ‘0000’.
11 I/O FACILITY
TheSAA56xxdeviceshave32 I/Olines,eachofwhich can
be individually addressed, or form four parallel 8-bit
addressable ports: Port 0, Port 1, Port 2 and Port 3.
I2C-bus ports (P1.4, P1.5, P1.6 and P1.7) can only be
configured as open-drain.
11.1 Port type
All individual ports can be programmed to function in one
of four modes, the mode is defined by two associated Port
Configuration Registers: PnCFGA and PnCFGB (where
n = port number 0, 1, 2 or 3). The modes available are
open-drain, quasi-bidirectional, high-impedance and
push-pull.
11.1.1 OPEN-DRAIN (TTL, 5 V TOLERANT)
The open-drain mode can be used for bidirectional
operation of a port and requires an external pull-up
resistor. The pull-up voltage has a maximum value of
5.5 V, to allow connection of the device into a 5 V
environment.
11.1.2 QUASI-BIDIRECTIONAL (CMOS, 3V3 TOLERANT)
The quasi-bidirectional mode is a combination of
open-drain and push-pull. It requires an external pull-up
resistor to VDDP (normally 3.3 V).
When a LOW-to-HIGH signal transition is output from the
device, the pad is put into push-pull mode for one clock
cycle (166 ns) after which the pad goes into open-drain
mode. This mode is used to speed up the edges of signal
transitions. This is the default mode of operation of the
pads after reset.
11.1.3 HIGH-IMPEDANCE (TTL, 5 V TOLERANT)
The high-impedance mode can be used for input only
operation of the port. When using this configuration, the
two output transistors are turned off.
11.1.4 PUSH-PULL (CMOS, 3V3 TOLERANT)
The push-pull mode can be used for output only. In this
mode, the signal is driven to either 0 V or VDDP, which is
nominally 3.3 V.
12 INTERRUPT SYSTEM
The device has 15 interrupt sources, each of which can be
enabled or disabled. When enabled, each interrupt can be
assigned one of two priority levels. There are five
interrupts that are common to the 80C51. Two of these are
external interrupts (EX0 and EX1); the other three are
timer interrupts (ET0, ET1 and ET2). In addition to the
conventional80C51,two applicationspecificinterrupts are
incorporated internal to the device, with the following
functionality:
•Closed Caption Data Ready interrupt (ECC). This
interrupt is generated when the device is configured in
Closed Caption Acquisition mode. The interrupt is
activated at the end of the currently selected Slice Line,
as defined in the CCLIN SFR.
•Display Busy interrupt (EBUSY). An interrupt is
generatedwhenthedisplay enters either a Horizontal or
Vertical Blanking Period. i.e. indicates when the
microcontroller can update the Display RAM without
causing undesired effects on the screen. This interrupt
can be configured in one of two modes using the
Memory Mapped Register (MMR) Configuration
Register (address 87FFH, bit TXT/V).
– Text Display Busy: An interrupt is generated on each
active horizontal display line when the Horizontal
Blanking Period is entered.
– Vertical Display Busy: An interrupt is generated on
each vertical display field when the Vertical Blanking
Period is entered.
2001 Feb 13 40
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
There are four interrupts connected to the 80C51
microcontroller peripherals, as follows:
•I2C-bus Transmit/Receive
•UART Receive
•UART Transmit
•UART Receive/Transmit.
Four additional general purpose external interrupts are
incorporated in the SAA56xx with programmable edge
detection (INT2 {EX2}, INT3 {EX3}, INT4 {EX4} and
INT5 {EX5}). The EXTINT SFR is used to configure each
of these interrupts as either level activated, rising edge,
falling edge or both edges sensitive, see Table 10.
12.1 Interrupt enable structure
Each of the individual interrupts can be enabled or
disabled by setting or clearing the relevant bit in the
interrupt enable SFRs (IE and IEN1). All interrupt sources
can also be globally disabled by clearing bit EA (IE.7), as
shown in Fig.10.
12.2 Interrupt enable priority
Each interrupt source can be assigned one of two priority
levels. The interrupt priorities are defined by the interrupt
priority SFRs (IP and IP1).
A low priority interrupt can be interrupted by a high priority
interrupt, but not by another low priority interrupt. A high
priority interrupt cannot be interrupted by any other
interrupt source.
If two requests of different priority level are received
simultaneously, the request with the higher priority level is
serviced. If requests of the same priority level are received
simultaneously, an internal polling sequence determines
which request is serviced. Thus, within each priority level
there is a second priority structure determined by the
polling sequence as defined in Table 12.
12.3 Interrupt vector address
The processor acknowledges an interrupt request by
executingahardwaregeneratedLCALLtotheappropriate
servicing routine. The interrupt vector addresses for each
source are shown in Table 12.
12.4 Level/edge interrupt
The external interrupt can be programmed to be either
level activated or transition activated by setting or clearing
the IT0/IT1 bits in the Timer Control SFR (TCON), see
Table 11.
The external interrupt INT1 differs from the standard
80C51 interrupt in that it is activated on both edges when
in edge sensitive mode. This is to allow software pulse
width measurement for handling remote control inputs.
The four other external interrupts INT2, INT3, INT4 and
INT5 are configured using the EXTINT register, as shown
in Table 10.
Table 10 Configuration of external interrupts
(INT2 to INT5)
Table 11 External interrupt activation
Table 12 Interrupt priority (within same level)
SFR EXTINT;
EXnCFG<1:0>;
n=2to5 MODE
00 level sensitive - active LOW
01 rising edge sensitive
10 falling edge sensitive
11 both edges sensitive
BIT LEVEL EDGE
IT0 active LOW
IT1 −INT0 = negative edge
INT1 = positive and negative edge
SOURCE PRIORITY
WITHIN
LEVEL
INTERRUPT
VECTOR RELATED
SFR
EX0 highest 0003H IEN0
ES2 002BH IEN0
EURX 0053H IEN1
ET0 000BH IEN0
EBUSY 0033H IEN0
EX2 005BH IEN1
EX1 0013H IEN0
ET2 003BH IEN1
EX3 0063H IEN1
ET1 001BH IEN0
EUART 0043H IEN1
EX4 006BH IEN1
ECC 0023H IEN0
EUTX 004BH IEN1
EX5 lowest 0073H IEN1
2001 Feb 13 41
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
priority
control
SFR IP<0:6>
SFR IP1<0:7>
global
enable
SFR IE.7
source
enable
SFR IE<0:6>
SFR IEN1<0:7>
interrupt
source
GSA074
L1
H1
highest priority level 0
highest priority level 1
EX0
lowest priority level 0
lowest priority level 1
ES2 L2
H2
EURX L3
H3
ET0 L4
H4
EBUSY L5
H5
EX2 L6
H6
EX1 L7
H7
ET2 L8
H8
EX3 L9
H9
ET1 L10
H10
EUART L11
H11
EX4 L12
H12
ECC L13
H13
EUTX L14
H14
EX5 L15
H15
Fig.10 Interrupt structure.
2001 Feb 13 42
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
13 TIMERS/COUNTERS
Three 16-bit Timers/counters are incorporated: Timer 0,
Timer 1 and Timer 2. Each can be configured to operate
as either timers or event counters. Timer 2 is new for the
SAA56xx, whereas Timer 0 and Timer 1 are standard
80C51 Timer/counters, refer to
“Handbook IC20
80C51-Based 8-bit Microcontrollers”
.Remark: It should
be noted that because the SAA56xx uses both clock
edges, the division factor is 6 instead of 12.
When the Timers/counters are configured as timers, the
period depends on the microcontroller clock frequency of
12 MHz.
In Timer mode, the register is incremented on every
machine cycle, so that machine cycles are counted. Since
the machine cycle consists of six oscillator periods, the
count rate is 1⁄6fclk (where fclk is the microcontroller clock
frequency: 12 MHz).
In Counter mode, the register is incremented in response
to a negative transition at its corresponding external pin
T0/T1/T2. Since pins T0/T1/T2 are sampled once per
machine cycle, it takes two machine cycles to recognise a
transition. This gives a maximum count rate of 1⁄12fclk
(where fclk is the microcontroller clock frequency, 12 MHz).
13.1 Timer/counter 0 and Timer/counter 1
There are six Special Function Registers used to control
Timer/counter 0 and Timer/counter 1.
Table 13 Timer/counter 0 and Timer/counter 1 registers
The Timer/counter function is selected by control bits C/T
in the Timer Mode SFR(TMOD). These two
Timers/counters have four operating modes, which are
selected by bit-pairs (M1 and M0) in TMOD. Details of the
modes of operation is given in
“Handbook IC20,
80C51-Based 8-Bit Microcontrollers”
.
TL0 and TH0 are the actual Timer/counter registers for
Timer 0. TL0 is the low byte and TH0 is the high byte. TL1
and TH1 are the actual Timer/counter registers for
Timer 1. TL1 is the low byte and TH1 is the high byte.
13.2 Timer/counter 2
Timer 2 is controlled using the following SFRs:
Table 14 Timer 2 Special Function Registers
Timer 2 can operate in four different modes
(see Table 15):
•Auto-reload
•Capture
•Baud rate generation
•Clock output.
The count-down option is only possible in the Auto-reload
mode with DCEN in T2MOD set and the external trigger
input disabled.
Table 15 Timer 2 operating mode
13.2.1 CAPTURE MODE
In the Capture mode, registers RCAP2L/RCAP2H are
used to capture the TL2/TH2 data. By setting/clearing bit
EXEN2 in T2CON, the external trigger input T2EX (P3.4)
can be enabled/disabled. If EXEN2 = 0, Timer 2 is a 16-bit
Timer/counter which, upon overflow, sets TF2 flag in
T2CON. If EXEN2 = 1, then Timer 2 does the above, but
with the added feature that a HIGH-to-LOW transition at
T2EX on Port 3.4 causes the current Timer 2 value
(TL2/TH2 data) to be captured into RCAP2L/RAP2H, and
bit EXF2 in T2CON to be set.
SFR ADDRESS
TCON 88H
TMOD 89H
TL0 8AH
TH0 8BH
TL1 8CH
TH1 8DH
SFR ADDRESS
T2CON F1H
T2MOD F2H
RCAP2L F3H
RCAP2H F4H
TL2 F5H
TH2 F6H
RCLK0 OR
TCLK0 OR
RCLK1 OR
TCLK1
CP/RL2 T2OE C/T2 OPERATING
MODE
0 0 0 X 16-bit Auto-reload
0 1 0 X 16-bit Capture
1 X X X Baud rate
generation
X 0 1 0 Clock output
2001 Feb 13 43
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
13.2.2 AUTO-RELOAD MODE
In the Auto-reload mode, Timer 2 can be programmed to
count up/down by clearing/setting bit DCEN in T2MOD.
13.2.3 COUNTING UP (DCEN = 0)
In the Auto-reload mode and when counting up, registers
RCAP2L/RCAP2H are used to hold a reload value for
TL2/TH2 when Timer 2 rolls over. By setting/clearing
bit EXEN2 in T2CON, external trigger T2EX on Port 3.4
can be enabled/disabled. If EXEN2 = 0, Timer 2 is a 16-bit
timer/counter which, upon overflow, sets TF2 and reloads
TL2/TH2 with the reload value in RCAP2L/RCAP2H.
If EXEN2 = 1, Timer 2 does the above, but with the added
feature that a HIGH-to-LOW transition at the external
trigger T2EX on Port 3.4 causes the current
RCAP2L/RCAP2H value to be loaded into TL2/TH2
respectively, and bit EXF2 in T2CON to be set.
Timer 2 interrupt is set if EXF2 or TF2 is set.
13.2.4 COUNTING UP (DCEN = 1 AND T2EX = 1)
In this mode Timer 2 counts up. When Timer 2 overflows
(FFFFH state), bit TF2 is set. This reloads TL2 and TH2
with the contents of RCAP2L and RCAP2H, respectively.
On overflow, bit EXF2 is inverted and hence toggles
during operation, so that bit EXF2 can be used as 17th bit,
if desired.
Timer 2 interrupt will be set only if TF2 is set.
13.2.5 COUNTING DOWN (DCEN = 1 AND T2EX = 0)
In this mode Timer 2 counts down. Underflow will occur
when the contents of TL2/TH2 match the contents of
RCAP2L/RCAP2H. A Timer 2 roll-over from 0000H to
FFFFH is not considered as an underflow. Upon
underflow,bit TF2 willbesetand registers TL2/TH2willbe
loaded with FFFFH. In addition, an underflow will cause
bit EXF2 to be inverted, such that it can be used as the
17th bit, if desired.
Timer 2 interrupt is set only if TF2 is set.
13.2.6 BAUD RATE GENERATION MODE
In this mode, timer overflow will load TL2 and TH2 with the
contents of T2CAPL and T2CAPH respectively and it will
not set TF2. Bit EXF2 will be set if EXEN2 is set and a
HIGH-to-LOW transition is detected on pin T2EX
(Port 3.4).
When Timer 2 is configured for timer operation, the timer
increments every state. Normally, as a timer, it would
increment every machine cycle.
Timer 2 interrupt is set only if EXF2 is set.
13.2.7 CLOCK OUTPUT MODE
Inthe clockoutputmode,externalpin T2 isusedas aclock
output. A timer overflow causes TL2 and TH2 to be loaded
with T2CAPL and T2CAPH, respectively. An overflow
toggles bit EXF2, which is connected to pin T2. The
frequency of T2 will be half the overflow frequency. Timer
overflow will not set TF2. A HIGH-to-LOW transition on the
external trigger T2EX on Port 3.4 sets EXF2. It is possible
toconfigureTimer 2in clock-outmode andbaud generator
mode simultaneously.
Timer 2 interrupt is set only if EXF2 is set.
14 WATCHDOG TIMER
The Watchdog Timer is a counter that, once in an overflow
state, forces the microcontroller into a reset condition. The
purpose of the Watchdog Timer is to reset the
microcontroller if it enters an erroneous processor state
(possibly caused by electrical noise or RFI) within a
reasonable period of time. When enabled, the Watchdog
circuit generates a system reset if the user program fails to
reload the Watchdog Timer within a specified length of
time, known as the Watchdog Interval.
The Watchdog Timer consists of an 8-bit counter with a
16-bit prescaler. The prescaler is fed with a signal whose
frequency is 1⁄6fclk (2 MHz for 12 MHz 80C51 core). The
8-bit counter is incremented every ‘t’ seconds where:
t6
1
f
clk
--------
2
16
×6 65536×
12 MHz
--------------------------
=32.768 ms==
2001 Feb 13 44
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
14.1 Watchdog Timer operation
The Watchdog Timer operation is activated when bit WLE
in the Power Control SFR (PCON) is set. The Watchdog
can be disabled by software by loading the value 55H into
the Watchdog Timer Key SFR (WDTKEY). This must be
performed before entering Idle/Power-down mode to
prevent exiting the mode prematurely.
Once activated, the Watchdog Timer SFR (WDT) must be
reloaded before the timer overflows. Bit WLE must be set
to enable loading of the WDT SFR. Once loaded, bit WLE
is reset by hardware, to prevent erroneous software from
loading the WDT SFR.
The value loaded into the WDT defines the Watchdog
Interval (WI):
For a 12 MHz microcontroller clock, t = 32.768 ms.
The range of intervals is from WDT = 00H, this gives
8.38 ms to WDT = FFH, which gives 32.768 ms.
15 PORT ALTERNATIVE FUNCTIONS
Ports 1, 2 and 3 are shared with alternative functions to
enable control of external devices and circuits. These
functions are enabled by setting the appropriate SFR and
also writing a logic 1 to the port bit that the function
occupies.
16 PULSE WIDTH MODULATORS
The device has eight 6-bit PWM outputs for analog control
of e.g. volume, balance, bass, treble, brightness, contrast,
hue and saturation. The PWM outputs generate pulse
patterns with a repetition rate of 21.33 µs, with the high
time equal to the PWM SFR value multiplied by 0.33 µs.
The analog value is determined by the ratio of the high
timetotherepetitiontime.ADC voltage proportional to the
PWM setting is obtained by means of an external
integration network (low-pass filter).
16.1 PWM control
The relevant PWM is enabled by setting the PWM enable
bit PWxE in the PWMx Control Register. The high time is
defined by the value PWxV<5:0>.
16.2 Tuning Pulse Width Modulator (TPWM)
The device has a single 14-bit TPWM that can be used for
Voltage Synthesis Tuning. The method of operation is
similar to the normal PWM, except that the repetition
period is 42.66 µs.
16.2.1 TPWM CONTROL
Two SFRs are used to control the TPWM: TDACL and
TDACH. The TPWM is enabled by setting bit TPWE in the
TDACH SFR. The most significant bits TD<13:7> alter the
high period between 0 and 42.33 µs. The seven least
significant bits TD<6:0> extend certain pulses by a further
0.33 µs. For example, if TD<6:0> = 01H, 1 in 128 periods
will be extended by 0.33 µs. If TD<6:0> = 02H,
2 in 128 periods will be extended.
TheTPWM willnotstart tooutputanewvalue untilTDACH
has been written to. Therefore, if the value is to be
changed, TDACL should be written before TDACH.
16.3 Software ADC (SAD)
Four successive approximation ADCs can be
implemented in software by using the on-board 8-bit
Digital-to-Analog Converter and Analog Comparator.
16.3.1 SAD CONTROL
The control of the required analog input is done using
channel select bits CH<1:0> in the SAD SFR. This selects
the required analog input to be passed to one of the inputs
of the comparator. The second comparator input is
generated by the DAC, whose value is set by bits
SAD<7:0> in the SAD and SADB SFRs. A comparison
between the two inputs is made when the start compare
bit ST in the SAD SFR is set. This must be at least one
instruction cycle after the SAD<7:0> value has been set.
The result of the comparison is given on VHI one
instruction cycle after bit ST is set.
16.3.2 SAD INPUT VOLTAGE
The external analog voltage that is used for comparison
with the internally generated DAC voltage does not have
the same voltage range due to the 5 V tolerance of the pin.
Itislimited toVDDP −Vtn whereVtn is a maximumof0.75 V.
For further details, refer to the
“SAA55XX and SAA56XX
Software Analogue to Digital Converter Application Note
SPG/AN99022”
.
WI 256 WDT–()t×=
2001 Feb 13 45
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
16.3.3 SAD DC COMPARATOR MODE
The SAD module (see Fig.11) incorporates a DC
Comparator mode, which is selected using the
‘DC_COMP’ control bit in the SADB SFR. This mode
enables the microcontroller to detect a threshold crossing
at the input to the selected analog input pin
(P3.0/ADC0, P3.1/ADC1, P3.2/ADC2 or P3.3/ADC3) of
the software ADC. A level sensitive interrupt is generated
when the analog input voltage level at the pin falls below
the analog output level of the SAD DAC.
This mode is intended to provide the device with a
wake-upmechanismfromPower-downorIdlemodewhen
a key-press on the front panel of the TV is detected.
The following software sequence should be used when
utilizing this mode for Power-down or Idle mode:
1. Disable INT1 using the IEN0 SFR.
2. Set INT1 to level sensitive using the TCON SFR.
3. Set the DAC digital input level to the desired threshold
level using SAD/SADB SFRs and select the required
input pin (P3.0, P3.1, P3.2 or P3,3) using CH1 and
CH0 in the SAD SFR.
4. Enter DC Compare mode by setting the ‘DC_COMP’
enable bit in the SADB SFR.
5. Enable INT1 using the IEN0 SFR.
6. Enter Power-down/Idle mode. Upon wake-up, the
SAD should be restored to its conventional operating
mode by disabling the ‘DC_COMP’ control bit.
handbook, halfpage
MBK960
MUX
4 : 1
ADC0
ADC1
ADC2
ADC3
CH<1:0>
SAD<3:0>
SADB<3:0>
VDDP
VHI
8-BIT
DAC
Fig.11 SAD block diagram.
2001 Feb 13 46
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
17 I2C-BUS SERIAL I/O
The I2C-bus consists of a serial data line (SDA) and a
serial clock line (SCL). The definition of the I2C-bus
protocol can be found in
“The I
2
C-bus and how to use it
(including specification). Philips Semiconductors
”.
The device operates in four modes:
•Master transmitter
•Master receiver
•Slave transmitter
•Slave receiver.
The microcontroller peripheral is controlled by the Serial
Control SFR (S1CON) and its status is indicated by the
Status SFR (S1STA). Information is transmitted/received
to/from the I2C-bus using the Data SFR (S1DAT). The
Slave Address SFR (S1ADR) is used to configure the
slave address of the peripheral.
The byte level I2C-bus serial port is identical to the I2C-bus
serial port on the P8xC558, except for the clock rate
selection bits CR<2:0>. The operation of the subsystem is
described in detail in the
“P8xC558 data sheet”.
17.1 I2C-bus modes
Three different I2C-bus selection tables for CR<2:0> can
be configured using the ROMBK SFR (IIC_LUT<1:0>), as
shown in Table 16.
17.1.1 NOMINAL MODE (IIC_LUT<1:0> = 00)
This option accommodates the P8xC558 I2C-bus, refer to
“Handbook IC20, 80C51-Based 8-Bit Microcontrollers”
.
The various serial rates are shown in Table 16:
Table 16 I2C-bus serial rates in ‘P8xC558 nominal mode’
17.1.2 FAST MODE (IIC_LUT<1:0> = 01)
This option accommodates the P8xC558 I2C-bus doubled
rates, as shown in Table 17.
Table 17 I2C-bus serial rates in ‘P8xC558 fast mode’
17.1.3 SLOW MODE’ (IIC_LUT<1:0> = 10)
This option accommodates the P8xC558 I2C-bus rates,
divided by 2, as shown in Table 18.
Table 18 I2C-bus serial rates ‘P8xC558 slow mode’
17.2 I2C-bus port selection
Two I2C-bus ports are available: SCL0/SDA0 and
SCL1/SDA1. The ports are selected by using TXT21.I2C
Port 0 and TXT21.I2C Port 1. When a port is enabled, any
information transmitted from the device goes onto the
enabled port. Information transmitted to the device can
only be acted on if the port is enabled.
If both ports are enabled, then data transmitted from the
device is seen on both ports. However, data transmitted to
the device on one port cannot be seen on the other port.
CR2 CR1 CR0 12 MHz
DIVISOR I2C-BUS BIT
FREQUENCY (kHz)
0 0 0 60 200
0 0 1 1600 7.5
0 1 0 40 300
011 30 400
1 0 0 240 50
1 0 1 3200 3.75
1 1 0 160 75
111 120 100
CR2 CR1 CR0 12 MHz
DIVISOR I2C-BUS BIT
FREQUENCY (kHz)
000 30 400
0 0 1 800 15
0 1 0 20 600
0 1 1 15 800
1 0 0 120 100
1 0 1 1600 7.5
1 1 0 80 150
1 1 1 60 200
CR2 CR1 CR0 12 MHz
DIVISOR I2C-BUS BIT
FREQUENCY (kHz)
0 0 0 120 100
0 0 1 3200 3.75
0 1 0 80 150
0 1 1 60 200
1 0 0 480 25
1 0 1 6400 1.875
1 1 0 320 37.5
1 1 1 240 50
2001 Feb 13 47
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
18 UART PERIPHERAL
The 80C51 microcontroller incorporates a full duplex
UARTwithasinglebytereceivebuffer,meaning that it can
commence reception of a second byte before the first is
read from the receive buffer. This register is implemented
twice. Writing to S0BUF writes to the transmit buffer.
Reading from S0BUF reads from the receive buffer. Only
hardwarecanread from thetransmitbufferand write to the
receive buffer.
The UART’s TX and RX pins connect to P0.1 and P0.0,
respectively.
Two registers (S0CON, S0BUF) and one bit (SMOD in
PCON register) control the UART.
Table 19 UART Special Function Registers
18.1 UART modes
The serial port can operate in four modes:
•Mode 0: Serial data enters and exits through RX. TX
outputs the shift clock. Eight bits are transmitted and
received (LSB first). The baud rate is fixed at 1⁄6fclk.
•Mode 1: Ten bits are transmitted (through TX) or
received(through RX):astartbit(logic 0), eightdatabits
(LSB first) and a stop bit (logic 1). On receive, the stop
bit goes into RB8 in SFR S0CON. The baud rate can be
varied at either Timer 1 or Timer 2 overflow rate.
•Mode 2: Eleven bits are transmitted (through TX) or
received (through RX): start bit (logic 0), eight data bits
(LSB first), a 9th data bit and a stop bit (logic 1).
On transmit, the 9th data bit, TB8 in S0CON, can be
assignedthevalue oflogic 0orlogic 1. For example,the
parity bit could be moved into TB8. On receive, the 9th
data bit goes into RB8 in S0CON, while the stop bit is
ignored. The baud rate can be programmed to either
1⁄32fclk or 1⁄64fclk.
•Mode 3: Eleven bits are transmitted (through TX) or
received(through RX):astartbit(logic 0), eightdatabits
(LSB first), a 9th data bit and a stop bit (logic 1). In fact,
Mode 3 is the same as Mode 2 in all respects except
baud rate. The baud rate can be varied at either Timer 1
or Timer 2 overflow rate.
In all four modes, transmission is initiated by any
instruction that uses S0BUF as a destination register.
Receptionisinitiatedin Mode 0by theconditionRI = 0and
REN = 1. In the other modes, reception is initiated by the
incoming start bit if REN = 1.
18.2 UART multiprocessor communications
Modes 2 and 3 have a special provision for multiprocessor
communications. In these modes, nine data bits are
received. The 9th bit goes into RB8, followed by a stop bit.
The port can be programmed such that when the stop bit
is received, the serial port interrupt will be activated only if
RB8 = 1. This feature is enabled by setting bit SM2 in
S0CON. A way to use this feature in multiprocessor
systems is as follows.
When the master processor wants to transmit a block of
data to one of several slaves, it first sends out an address
byte which identifies the target slave. An address byte
differs from a data byte. The 9th bit is logic 1 in an address
byte and logic 0 in a data byte. With SM2 = 1, no slave will
be interrupted by a data byte reception.
An address byte, however, will interrupt all slaves, so that
each slave can examine the received byte and see if it is
being addressed. The addressed slave will clear its SM2
bit and prepare to receive the data bytes that will follow.
The slaves that were not being addressed leave their
SM2 bits set and carry on the task they were performing.
Bit SM2 has no effect in Mode 0; in Mode 1, it can be used
to check the validity of the stop bit. When receiving in
Mode 1 (if SM2 = 1), the receive interrupt will not be
activated unless a valid stop bit is received.
18.3 S0BUF registers
This register is implemented twice. Writing to S0BUF
writes to the transmit buffer. Reading from S0BUF reads
from the receive buffer. Only hardware can read from the
transmit buffer and write to the receive buffer.
SFR ADDRESS
S0CON 99H
S0BUF 9AH
2001 Feb 13 48
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
18.4 UART baud rates
Remark: fclk usedinthefollowingcalculationsreferstothe
microcontroller clock frequency (12 MHz).
The serial port can operate with different baud rates,
dependingonitsmode. The baud rateinMode0 is derived
from state 2 and state 5, and thus fixed:
•Mode 0 baud rate = 1⁄6fclk
The baud rate in Mode 2 depends on the value of
bit SMOD:
•If SMOD = 0, the baud rate is 1⁄32fclk
•If SMOD = 1, the baud rate is 1⁄16fclk
•Mode 2 baud rate =
The baud rates in Modes 1 and 3 are determined by the
timer overflow rate and the value of SMOD as follows:
•Modes 1 and 3
baud rate =
•Modes 1 and 3 baud rate = 1⁄16 ×Timer 2 overflow rate.
In this application, the Timer 1 interrupt should be
disabled. The Timer can be configured for either ‘timer’ or
‘counter’operationin any ofitsthreerunning modes. In the
most typical applications, it is configured for ‘timer’
operation. In the Auto-reload mode (high nibble of
TMOD = 0010B), the baud rate is given by the formula:
Modes 1 and 3 baud rate =
Very low baud rates can be achieved with Timer 1 by
leaving the Timer 1 interrupt enabled and configuring the
Timer to run as a 16-bit timer (high nibble of
TMOD = 0001B), plus using the Timer 1 interrupt to do a
16-bit software reload.
Timer 2 has a programming mode to function as baud rate
generator for the UART. In this mode, the baud rate is
given by the formula:
Modes 1 and 3 baud rate =
For further details on the UART operation, refer to
“Handbook IC20, 80C51-Based 8-Bit Microcontrollers”
.
19 LED SUPPORT
Port pins P0.5 and P0.6 have an 8 mA current sinking
capability to enable LEDs in series with current limiting
resistors to be driven directly, without the need for
additional buffering circuits.
20 EXTERNAL SRAM/ROM INTERFACE
The external address/data bus of the 80C51
microprocessor may be interfaced to:
•Additional SRAM Data memory for multi-page
acquisition applications
•External Program ROM.
The application circuit can be achieved using either the
multiplexed address and data I/O or the de-multiplexed
address and data I/O.
It is possible to interface up to 256 kbytes of external data
memory using pins RAMBK<1:0> and A15_BK. Each of
the four Data memory banks is selected by
RAMBK<1:0> (SFR ROMBK<4:3>), see Table 20.
Table 20 RAMBK selection
It is possible to interface up to 192 kbytes of external
program ROM, which is addressed using the contiguous
address bus (A17_LN, A16_LN, A15_LN).
Remark: Although this is an 18-bit bus, the internal
microcontroller logic makes it possible to only address
192 bytes with linear addressing.
Figures 12 and 13 show the interfacing connections for
both external SRAM Data memory and external program
ROM. The SRAM connections are an example, for further
information refer to Section 29.2.
2SMOD
32
------------------ fclk
×
2SMOD
32
------------------ Timer 1 overflow rate×
2SMOD
32
------------------ fclk
6 256 T1H–()×
------------------------------------------
×
1
16
------ fclk
6 256 T2H–()×
------------------------------------------
×
RAMBK<1:0> BANK EXTERNAL
ADDRESS RANGE
00 Bank 0 0 to 64 kbytes
01 Bank 1 64 to 128 kbytes
10 Bank 2 128 to 192 kbytes
11 Bank 3 192 to 256 kbytes
2001 Feb 13 49
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
GSA075
WR WE
SAA56xx
SRAM
RD OE
RAMBK<1:0>A<17:16>
A15_BK A15
A<14:8>A<14:8>
AD<7:0>
AD<7:0>
D<7:0>
A<7:0>
ALE
A<7:0>
CE
LATCH
Fig.12 External SRAM configuration.
handbook, full pagewidth
GSA076
SAA56xx
ROM
PSEN OE
ROMBK<2:0>, A15_BK
or A<17_LN:15_LN>A<17:15>
A<14:8>A<14:8>
AD<7:0>
AD<7:0>
D<7:0>
A<7:0>
ALE
A<7:0>
LATCH
Fig.13 External ROM configuration.
2001 Feb 13 50
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
21 MEMORY INTERFACE
The memory interface controls access to the embedded
DRAM, refreshing of the DRAM and page clearing. The
DRAM is shared between Data Capture, display and
microcontroller sections.
The Data Capture section uses the DRAM to store
acquiredinformationthathasbeenrequested.Thedisplay
reads from the DRAM information and converts it to RGB
values. The microcontroller uses the DRAM as embedded
auxiliary RAM.
21.1 Memory structure
The memory is partitioned into two distinct areas, the
dedicated Auxiliary RAM area and the Display RAM area.
When not being used for Data Capture or display, the
Display RAM area can be used as an extension to the
auxiliary RAM area.
21.1.1 AUXILIARY RAM
The Auxiliary RAM is not initialised at power-up and must
be initialised by the application software. Its contents are
maintained during Idle mode and Standby mode, but are
lost if Power-down mode is entered.
21.1.2 DISPLAY RAM
The Display RAM is initialised on power-up to a value of
20H throughout. The contents of the Display RAM are
maintained when entering Idle mode. If Idle mode is exited
using an interrupt, the contents are unchanged, if Idle
mode is exited using an external reset, the contents are
initialised to 20H.
Full Closed Caption display requires display RAM from
8000H to 845FH. The memory from 8460H to 84FFH
(must be initialised by the application software) can be
utilised as an extension to the dedicated contiguous
Auxiliary RAM that occupies 0000H to 07FFH.
21.2 Memory mapping
The dedicated auxiliary RAM area occupies 2 kbytes, with
an address range from 0000H to 07FFH. The Display
RAM occupies a maximum of 12 kbytes with an address
range from 2000H to 5000H for TXT mode and
8000H to 84FFH for CC mode (see Fig.14). Although
having different address ranges, the two modes occupy
physically the same DRAM area.
21.3 CCBASE SFR
The SAA56xx incorporates a CCBASE SFR, which
enables CC Display data to be accessed from any 1-kbyte
partition within the Display memory. This SFR allows the
CC Base address for Closed Caption Display memory to
overlap Teletext memory at the following hexadecimal
boundaries of the 80C51 microcontroller ‘MOVX’ address
space:
2000H(sameasSAA55xdefault),2400H,2800H,2C00H,
3000H, 3400H, 3800H, 3C00H, 4000H, 4400H, 4800H,
4C00H, 5000H, 5400H, 5800H, 5C00H, 6000H, 6400H,
6800H and 6C00H.
Theresetvaluefor theCCBASEAddressSFRis20H,thus
ensuring software compatibility with other variants in the
SAA55xx family. Register bits CCBASE1 and CCBASE0
must always be set to zero at 1-kbyte boundaries.
Figure 14 shows the default setting for the CC Display
memory.
handbook, halfpage
GSA061
upper 32 kbyteslower 32 kbytes
AUXILIARY
TXT BLOCK 0
0000H
0800H
2000H
TXT BLOCK 9 2400H
TXT BLOCK 1 2800H
TXT BLOCK 2 2C00H
TXT BLOCK 3 3000H
TXT BLOCK 4 3400H
TXT BLOCK 5 3800H
TXT BLOCK 6 3C00H
TXT BLOCK 7 4000H
TXT BLOCK 8
TXT BLOCK 10
TXT BLOCK 19
4400H
4800H
4C00H
5000H
7FFFH
CC DISPLAY 8000H
84FFH
FFFFH
Fig.14 DRAM memory mapping.
2001 Feb 13 51
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
21.4 Addressing memory
The memory can be addressed by the microcontroller in
two ways, either directly using a MOVX command or via
SFRs, depending on what address is required.
The dedicated Auxiliary RAM, and Display memory in the
range 8000H to 86FFH can only be accessed using the
MOVX command.
The Display memory in the range 2000H to 47FFH can
either be directly accessed using the MOVX command, or
via the SFRs.
21.4.1 TXT DISPLAY MEMORY SFR ACCESS
When in TXT mode (see Fig.15), the Display memory is
configured as 40 columns wide by 25 rows and occupies
1K ×8-bit of memory. There can be a maximum of
12 display pages. Using TXT15.BLOCK<3:0> and
TXT15.MICRO BANK, the required display page can be
selected to be written to. The row and column within that
block is selected using TXT9.R<4:0> and TXT10.C<5:0>.
The data at the selected position can be read or written
using TXT11.D<7:0>.
Whenever a read or write is performed on TXT11, the row
values stored in TXT9 and column value stored in TXT10
are automatically incremented. For rows 0 to 24, the
column value is incremented up to a maximum of 39, at
which point it resets to 0 and increments the row counter
value. When row 25 column 23 is reached, the values of
the row and column are both reset to 0.
Writing values outside the valid range for TXT9 or TXT10
will cause undetermined operation of the
auto-incrementing function for accesses to TXT11.
21.4.2 TXT DISPLAY MEMORY MOVX ACCESS
For the generation of OSD displays that use this mode of
access, it is important to understand the mapping of the
MOVX address onto the display row and column value.
This mapping of row and column onto address is shown in
Table 21. The values shown are added onto a base
addressfortherequiredmemory block (see Fig.15) to give
a 16-bit address.
Table 21 Column and row to ‘MOVX’ address (lower 10 bits of address in hexadecimal)
ROW COL. 0 ..... COL. 23 ..... COL. 31 COL. 32 ..... COL. 39
Row 0 000 ..... 017 ..... 01F 3F8 ..... 3FF
Row 1 020 ..... 037 ..... 03F 3F0 ..... 3F7
: ::::: :::
: ::::: :::
Row 23 2E0 ..... 3F7 ..... 2FF 340 ..... 347
Row 24 300 ..... 317 ..... 31F 338 ..... 33F
Row 25 320 ..... 337
2001 Feb 13 52
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
0203010
C
9023
39
Column
10
MBK962
control data
active position TXT9.R<4:0> = 01H, TXT10.C<5:0> = 0AH, TXT11 = 43H
non-displayable data
(byte 10 reserved)
Row 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Fig.15 TXT memory map.
2001 Feb 13 53
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
21.5 Page clearing
Page clearing is performed on request from the Data
Capturesectionorthe microcontroller, under the control of
the embedded software.
At power-on and reset, the whole of the page memory is
cleared. Bit TXT13.PAGE CLEARING is set while this
takes place.
21.5.1 DATA CAPTURE PAGE CLEAR
When a page header is acquired for the first time after a
new page request or a page header is acquired with the
erase (C4) bit set, the page memory is ‘cleared’ to spaces
before the rest of the page arrives.
When this occurs, the space code (20H) is written into
every location of rows 1 to 23 of the basic page memory,
the appropriate packet 27 row of the extension packet
memory and the row where Teletext packet 24 is written.
This last row is either row 24 of the basic page memory (if
the TXT0.X24 POSN bit is set) or row 0 of the extension
packet memory (if the bit is not set).
Page clearing is done before the end of the TV line in
which the header arrived which initiated the page clear.
This means that the 1 field gap between the page header
and the rest of the page which is necessary for many
Teletext decoders is not required.
21.5.2 SOFTWARE PAGE CLEAR
The software can also initiate a page clear by setting bit
TXT9.CLEAR MEMORY. Now, every location in the
memory block pointed to by TXT15.BLOCK<3:0> is
cleared to a space code (20H). Bit CLEAR MEMORY is
not latched, so the software does not have to reset it after
it has been set.
Onlyone pagecanbeclearedin aTV line.Therefore, ifthe
software requests a page clear, it will be carried out on the
nextTV lineonwhichthe Data Capture hardware does not
force the page to be cleared. A flag (TXT13.PAGE
CLEARING) is provided to indicate that a software
requested page clear is being carried out. The flag is set
when a logic 1 is written to bit TXT9.CLEAR MEMORY
and is reset when the page clear has been completed.
Alllocationsareclearedto00Hif bit TXT0.INV ON = 1and
a page clear is initiated on Block 8.
21.6 Multi-page operations
When using SAA56xx in a multi-page application with
external SRAM, bit TXT28.MULTI PAGE should be set.
This allows the 80C51 microcontroller to copy acquired
databetweeninternalDisplaymemory andexternalSRAM
without hindrance.
2001 Feb 13 54
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22 DATA CAPTURE
The Data Capture section (see Fig.16) takes in the analog
Composite Video and Blanking Signal (CVBS), and
extracts the required data from it in the digital domain. The
datais thendecodedand storedinmemory.Thefirststage
converts the analog CVBS signal to digital form, using
ADC sampling at 12 MHz. Data and clock recovery is then
performed by a Multi-rate Video Input Processor (MulVIP).
Next, the following types of data are extracted: WST
Teletext (625/525), VPS, Closed Caption (CC) and WSS.
The extracted data is stored in either memory (DRAM) via
the Memory Interface or in SFR locations.
22.1 Data Capture features
•Two CVBS inputs
•Video Signal Quality detector
•Data Capture for 625-line WST
•Data Capture for 525-line WST
•Data Capture for line 21 data service (Closed Caption)
•Data Capture for VPS data (PDC system A)
•Data Capture for WSS bit decoding
•Automatic selection between 525 WST/625 WST
•Automatic selection between 625 WST/VPS on
line 16 of Vertical Blanking Interval (VBI)
•Real-time capture and decoding for WST Teletext in
hardware, to enable optimized microprocessor
throughput
•Up to 12 pages stored on-chip
•Inventory of transmitted Teletext pages stored in the
Transmitted Page Table and Subtitle Page Table
•Automatic detection of Fastext transmission
•Real-time packet 26 engine in hardware for processing
accented, G2 and G3 characters
•Signal quality detector for WST/VPS data types
•Comprehensive Teletext language coverage
•Full-Field and VBI Data Capture of WST data.
handbook, full pagewidth
ADC
data<7:0>VCS
SYNC_FILTER
TTDTTC
DATA SLICER
AND
CLOCK RECOVERY
output data to
memory interface output data to SFRs
MBK963
ACQUISITION
FOR
WST/VPS
ACQUISITION
FOR
CC/WSS
CVBS
SWITCH
CVBS
CVBS0 CVBS1
ACQUISITION
TIMING
SYNC
SEPARATOR
Fig.16 Data Capture block diagram.
2001 Feb 13 55
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22.1.1 CVBS SWITCH
The CVBS switch is used to select the required analog
input, depending on the value of TXT8.CVBS1/CVBS0.
22.1.2 ANALOG-TO-DIGITAL CONVERTER
The output of the CVBS switch is passed to a
Differential-to-Single-Ended Converter (DIVIS, not shown
in Fig.16), although here it is used in single-ended
configuration with a reference. A full-flash ADC with a
sampling rate of 12 MHz converts the analog output of the
DIVIS to a digital representation.
22.1.3 MULTI-RATE VIDEO INPUT PROCESSOR (MULVIP)
The MulVIP (used for data and clock recovery) is a Digital
Signal Processor designed to extract the data and recover
the clock from a digitized CVBS signal.
22.1.4 DATA STANDARDS AND CLOCK RATES
The data standards and clock rates that can be recovered
are shown in Table 22.
Table 22 Data standards and clock rates
22.1.5 DATA CAPTURE TIMING
The Data Capture timing section uses the synchronisation
information extracted from the CVBS signal to generate
the required horizontal and vertical reference timings.
The timing section automatically recognizes and selects
the appropriate timings for either 625 (50 Hz)
synchronisation or 525 (60 Hz) synchronisation.
A TXT12.VIDEO SIGNAL QUALITY flag is set when the
timing section is locked correctly to the incoming CVBS
signal. When TXT12.VIDEO SIGNAL QUALITY is set,
another flag TXT12.525/625 SYNC can be used to identify
the standard.
22.1.6 ACQUISITION
The acquisition section extracts the relevant information
from the serial stream of data from the MulVIP and stores
it in memory.
22.1.6.1 Making a page request
A page is requested by writing a series of bytes into the
TXT3.PRD<4:0> SFR, which corresponds to the number
of the page required. The bytes written into TXT3 are
stored in a RAM with an auto-incrementing address. The
start address for the RAM is set using the TXT2.SC<2:0>
(to define which part of the page request is being written)
and TXT2.REQ<3:0> (along with TXT2.ACQ BANK) is
used to define which of the 12 page request blocks is
being modified.
If TXT2.REQ<3:0> is greater than 09H, then data being
written to TXT3 is ignored (applies to Bank 0 and Bank 1).
Table 23 shows the contents of the page request RAM.
Upto12 pages of Teletextcanbeacquired on the 12 page
device, when TXT1.EXT PKT OFF is set to logic 1, and up
to 10 pages can be acquired when this bit is set to logic 0.
Table 23 The contents of the Page request RAM
If the ‘Do Care’ bit for part of the page number is set to
logic 0, then that part of the page number is ignored when
the Teletext decoder is deciding whether a page being
received off-air should be stored or not. For example, if the
‘Do Care’ bits for the four subcode digits are all set to
logic 0, then every subcode version of the page will be
captured.
DATA STANDARD CLOCK RATE
625 WST 6.9375 MHz
525 WST 5.7272 MHz
VPS 5.0 MHz
WSS 5.0 MHz
Closed Caption 500 kHz
START
COLUMN PRD4 PRD3 PRD2 PRD1 PRD0
0 Do Care
Magazine HOLD MAG2 MAG1 MAG0
1 Do Care
Page Tens PT3 PT2 PT1 PT0
2 Do Care
Page Units PU3 PU2 PU1 PU0
3 Do Care
Hour Tens X X HT1 HT0
4 Do Care
Hours
Units
HU3 HU2 HU1 HU0
5 Do Care
Minutes
Tens
X MT2 MT1 MT0
6 Do Care
Minutes
Units
MU3 MU2 MU1 MU0
7X XXE1E0
2001 Feb 13 56
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Whenbit HOLDis set toalogic 0,theTeletext decoder will
notrecogniseanypageashavingthecorrectpage number
and no pages will be captured. In addition to providing the
user requested hold function, this bit should be used to
prevent the inadvertent capture of an unwanted page
when a new page request is being made. For example, if
the previous page request was for page 100 and this was
being changed to page 234, it would be possible to
capture page 200 if this arrived after only the requested
magazine number had been changed.
Bits E1and E0 control the error checking, which should be
carried out on packets 1 to 23 when the page being
requested is captured. This is described in more detail in
Section 22.1.6.3.
For a multi-page device, each packet can only be written
into one place in the Teletext RAM. Therefore, if a page
matches more than one of the page requests, the data is
written into the area of memory corresponding to the
lowest numbered matching page request.
Atpower-up,eachpage request defaults to any page, hold
on and error check Mode 0.
22.1.6.2 Rolling headers and time
When a new page is requested, it is conventional for the
decoder to turn the header row of the display green and to
display each page header as it arrives until the correct
page is found.
When a page request is changed (i.e. when the TXT3 SFR
is written to), a flag (PBLF) is written into bit 5, column 9,
row 25 of the corresponding block of the page memory.
The state of the flag for each block is updated every
TV line 1. If it is set for the current display block, the
acquisition section writes all valid page headers that arrive
into the display block and automatically writes an
alphanumeric green character into column 7 of row 0 of
the display block every TV line.
When a requested page header is acquired for the first
time, rows 1 to 23 of the relevant memory block are
cleared to space, i.e. have 20H written into every column,
before the rest of the page arrives. Row 24 is also cleared
if bit TXT0.X24 POSN is set. If bit TXT1.EXT PKT OFF is
set, the extension packets corresponding to the page are
also cleared.
The last eight characters of the page header are used to
providea timedisplayand arealwaysextractedfromevery
valid page header as it arrives and written into the display
block.
Bit TXT0.DISABLE HEADER ROLL prevents any data
being written into row 0 of the page memory, except when
a page is acquired off-air, i.e. rolling headers and time are
not written into the memory. Bit TXT1.ACQ OFF prevents
any data being written into the memory by the Teletext
acquisition section.
When a parallel magazine mode transmission is being
received, only headers in the magazine of the page
requested are considered valid for the purposes of rolling
headers and time. Only one magazine is used even if the
Do Care magazine bit is set to logic 0. When a serial
magazine mode transmission is being received, all page
headers are considered to be valid.
22.1.6.3 Error checking
Teletext packets are error checked before they are written
into the page memory. The error checking carried out
dependson the packet number, the byte number, the error
check mode bits in the page request data and
bit TXT1.8-BIT (see Fig.17).
If an uncorrectable error occurs in one of the Hamming
checked addressing and control bytes in the page header
or in the Hamming checked bytes in packet 8/30, bit 4 of
the byte written into the memory is set, to act as an error
flag to the software. If uncorrectable errors are detected in
any other Hamming checked data, the byte is not written
into the memory.
2001 Feb 13 57
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
MGK465
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 1
Packet X/0
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0, error check mode = 0
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0, error check mode = 1
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0, error check mode = 2
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0, error check mode = 3
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 1
Packet X/1-23
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 0
3938373635343332313029282726252423222120191817161514131211109876543210
'8-bit' bit = 1
Packet X/24
3938373635343332313029282726252423222120191817161514131211109876543210
Packet X/27/0
3938373635343332313029282726252423222120191817161514131211109876543210
Packet 8/30/0,1
3938373635343332313029282726252423222120191817161514131211109876543210
8-bit
data
Packet 8/30/2,3,4-15
odd parity
checked 8/4 Hamming
checked
Fig.17 Error checking.
2001 Feb 13 58
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22.1.6.4 Teletext memory organisation
The Teletext memory is divided into two banks of ten
blocks. Normally, when bit TXT1.EXT PKT OFF is logic 0,
each of blocks 0 to 8 contains a Teletext page arranged in
the same way as the basic page memory of the page
device (see Fig.18) and Block 9 contains extension
packets (applies to Bank 0 and Bank 1), see Fig.19.
When bit TXT1.EXT PKT OFF is logic 1, no extension
packets are captured and Block 9 of both Bank 0 and
Bank 1 of the memory are used to store two other pages.
The number of the memory block into which a page is
written corresponds to the page request number
(TXT2.REQ<3:0>) which resulted in the capture of the
page.
Packet 0, the page header, is split into two parts when it is
written into the text memory. The first eight bytes of the
header contain control and addressing information. They
are Hamming decoded and written into columns 0 to 7 of
row 25, which also contains the magazine number of the
acquired page and the PBLF flag. However, the last
14 bytes are unused and may be used by the software, if
necessary.
handbook, full pagewidth
Row 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
0678
9023
39
Packet X/0
Basic Page Blocks (0 to 9 Bank 0; 0 and 9 Bank 1)
OSD only Packet X/1
Packet X/2
Packet X/3
Packet X/4
Packet X/5
Packet X/6
Packet X/7
Packet X/8
Packet X/9
Packet X/10
Packet X/11
Packet X/12
Packet X/13
Packet X/14
Packet X/15
Packet X/16
Packet X/17
Packet X/18
Packet X/19
Packet X/20
Packet X/21
Packet X/22
Packet X/23
Packet X/24(1)
GSA071
Control Data VPS Data(2)
10(3)
Fig.18 Packet storage locations.
(1) If ‘X24 POSN’ bit = 1.
(2) VPS data only in block 9 of either bank 0 or bank 1.
(3) Byte 10 reserved.
2001 Feb 13 59
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
0
1
2
3
4
5
6
7
8
9
9230
10
11
12
13
14
15
20
21
22
23
24
25
16
17
18
19
Row Packet X/24 for page in block 0(1)
Packet X/24 for page in block 1(1)
Packet X/27/0 for page in block 0
Packet X/27/0 for page in block 1
Packet X/24 for page in block 2(1)
Packet X/27/0 for page in block 2
Packet X/24 for page in block 3(1)
Packet X/27/0 for page in block 3
Packet X/24 for page in block 4(1)
Packet X/27/0 for page in block 4
Packet X/24 for page in block 5(1)
Packet X/27/0 for page in block 5
Packet X/24 for page in block 6(1)
Packet X/27/0 for page in block 6
Packet X/24 for page in block 7(1)
Packet X/27/0 for page in block 7
Packet X/24 for page in block 8(1)
Packet X/27/0 for page in block 8
Packet 8/30/0.1
Packet 8/30/2.3
Packet 8/30/4-15 Packet 8/30/4-15
VPS Data
Extension Packet (Block 9 Bank 0)
10(2)
GSA072
0
1
2
3
4
5
6
7
8
9
9230
10
11
12
13
14
15
20
21
22
23
24
25
16
17
18
19
Row Packet X/24 for page in block 0(1)
Packet X/27/0 for page in block 0
Packet 8/30/0.1
Packet 8/30/2.3
VPS Data
Extension Packet (Block 9 Bank 1)
10(2)
Fig.19 Extension packet storage locations.
(1) If ‘X24 POSN’ bit = 0.
(2) Byte 10 reserved.
2001 Feb 13 60
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22.1.6.5 Row 25 data contents
The Hamming error flags are set if the on-board
8/4 Hamming checker detects that there has been an
uncorrectable (2-bit) error in the associated byte. It is
possible for the page to still be acquired if some of the
page address information contains uncorrectable errors if
that part of the page request was a ‘Don’t Care’. There is
no error flag for the magazine number because an
uncorrectable error in this information prevents the page
being acquired.
The interrupt sequence (C9) bit is automatically dealt with
by the acquisition section, so that rolling headers do not
contain a discontinuity in the page number sequence.
The magazine serial bit (C11) indicates whether the
magazine transmission is serial or parallel. This affects
how the acquisition section operates and is dealt with
automatically.
The newsflash (C5), subtitle (C6), suppress header (C7),
inhibit display (C10) and language control (C12 to 14) bits
are dealt with automatically by the display section.
The update bit (C8) has no effect on the hardware. The
remaining 32 bytes of the page header are parity checked
and written into columns 8 to 39 of row 0. Bytes that pass
the parity check have the MSB set to a logic 0 and are
written into page memory. Bytes with parity errors are not
written into the memory.
Table 24 The data in row 25 of the basic page memory
COL BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
0000Hamming error PU3 PU2 PU1 PU0
1000Hamming error PT3 PT2 PT1 PT0
2000Hamming error MU3 MU2 MU1 MU0
3000Hamming error C4 MT2 MT1 MT0
4000Hamming error HU3 HU2 HU1 HU0
5000Hamming error C6 C5 HT1 HT0
6000Hamming error C10 C9 C8 C7
7000Hamming error C14 C13 C12 C11
8000 FOUND 0 MAG2 MAG1 MAG0
9 0 0 PBLF 0 0000
10 to 23 −−− unused −−−−
2001 Feb 13 61
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22.1.6.6 Inventory page
If bit TXT0.INV ON is a logic 1, memory block 8 of Bank 0
is used as an inventory page.This consists of two tables:
the Transmitted Page Table (TPT) and the Subtitle Page
Table (SPT); see Fig.20.
In each table, every possible combination of the page tens
and units digit, 00H to FFH, is represented by a byte,
see Fig.21. Each bit of these bytes corresponds to a
magazine number so each page number, from
100H to 8FFH, is represented by a bit in the table.
The bit for a particular page in the TPT is set when a page
header is received for that page. The bit in the SPT is set
whenapage headerforthe page isreceivedwhich has the
‘subtitle’ page header control bit (C6) set. The bit for a
particular page in the TPT is set when a page header is
received for that page. The bit in the SPT is set when a
page header for the page is received which has the
‘subtitle’ page header control bit (C6) set.
handbook, full pagewidth
MGD165
0
1
2
3
4
5
6
7
8
9
230
039
10
11
12
13
14
15
20
21
22
23
24
25
16
17
18
19
Row
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Unused
Transmitted
Pages
Table
Subtitle
Pages
Table
Fig.20 Inventory page organisation.
2001 Feb 13 62
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
x00
x01
x02
x03
x04
x05
x06
x07
x08
x09
x0a
x0b
x0c
x0d
x0e
x0f
x10
x11
x12
x13
x14
x15
x16
x17
x18
x19
x1a
x1b
x1c
x1d
x1e
x1f
x20
x21
x22
x23
x24
x25
x26
x27
x28
x29
x2a
x2b
x2c
x2d
x2e
x2f
x30
x31
x32
x33
x34
x35
x36
x37
x38
x39
x3a
x3b
x3c
x3d
x3e
x3f
xc0
xc1
xc2
xc3
xc4
xc5
xc6
xc7
xc8
xc9
xca
xcb
xcc
xcd
xce
xcf
xd0
xd1
xd2
xd3
xd4
xd5
xd6
xd7
xd8
xd9
xda
xdb
xdc
xdd
xde
xdf
xe0
xe1
xe2
xe3
xe4
xe5
xe6
xe7
xe8
xe9
xea
xeb
xec
xed
xee
xfef
xf0
xf1
xf2
xf3
xf4
xf5
xf6
xf7
xf8
xf9
xfa
xfb
xfc
xfd
xfe
xff
7xx
bit
7
Bytes in the table
bits in each byte
column
row n
n + 1
n + 6
n + 7
0
0
MGD160
81624 3239
6xx 5xx 4xx 3xx 2xx 1xx 8xx
Fig.21 Transmitted/subtitle page organisation.
22.1.6.7 Packet 26 processing
One of the uses of packet 26 is to transmit characters that
are not in the basic Teletext character set. The family
automatically decodes packet 26 data and, if a character
corresponding to that being transmitted is available in the
character set, automatically writes the appropriate
character code into the correct location in the Teletext
memory.
This is not a full implementation of the packet 26
specification allowed for in level 2 Teletext, and so is often
referred to as level 1.5.
By convention, the packets 26 for a page are transmitted
before the normal packets. To prevent the default
character data overwriting the packet 26 data, there is a
mechanism which prevents packet 26 data from being
overwritten.ThemechanismisdisabledwhentheSpanish
national option is detected because the Spanish
transmission system sends even parity (i.e. incorrect)
characters in the basic page locations corresponding to
the characters sent via packet 26 and these will not
overwrite the packet 26 characters anyway. The special
treatment of the Spanish national option is disabled if
bit TXT12.SPANISH is cleared (logic 0) or if
bit TXT8.DISABLE SPANISH is set (logic 1).
Packet 26 data is processed regardless of bit
TXT1.EXT PKT OFF, but setting bit TXT1.X26 OFF
disables packet 26 processing.
Bit TXT8.PKT26 RECEIVED is set by the hardware
whenever the packet 26 decoding hardware writes a
character into the page memory. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.6.8 525-line World System Teletext
The 525-line format (see Fig.22) is similar to the 625-line
format but the data rate is lower and there are fewer data
bytes per packet (32 rather than 40). There are still
40 characters per display row so extra packets are sent,
each containing the last eight characters for four rows.
These packets can be identified by the ‘tabulation bit’ (T),
which replaces one of the magazine bits in 525-line
Teletext. When an ordinary packet with T = 1 is received,
the decoder puts the data into the four rows, starting with
that corresponding to the packet number, but with the two
LSBs set to logic 0. For example, a packet 9 with T = 1
(packet X/1/9) contains data for rows 8, 9, 10 and 11.
The error checking carried out on data from packets with
T = 1 depends on the setting of bit TXT1.8-BIT and the
error checking control bits in the page request data and is
the same as that applied to the data written into the same
memory location in the 625-line format.
The rolling time display (the last eight characters in row 0)
is taken from any packets X/1/1, 2 or 3 received.
In parallel magazine mode, only packets in the correct
magazine are used for the rolling time. Packet number
X/1/0 is ignored.
2001 Feb 13 63
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
The tabulation bit is also used with extension packets.
The first eight data bytes of packet X/1/24 are used to
extend the Fastext prompt row to 40 characters. These
characters are written into whichever part of the memory
the packet 24 is being written into (determined by the
‘X24 POSN’ bit).
Packets X/0/27/0 contain five Fastext page links and the
link control byte. They are captured, Hamming checked
and stored in the same way as are packets X/27/0 in
625-line text. Packets X/1/27/0 are not captured.
Because there are only two magazine bits in 525-line text,
packets with the magazine bits all set to a logic 0 are
referred to as being in magazine 4. Therefore, the
broadcast service data packet is packet 4/30, rather than
packet 8/30.
Asin625-line text, the first 20 bytes of packet 4/30 contain
encoded data that is decoded in the same way as in
packet 8/30. The last 12 bytes of the packet contains half
of the parity encoded status message. Packet 4/0/30
contains the first half of the message and packet 4/1/30
contains the second half. The last four bytes of the
message are not written into memory. The first 20 bytes of
the each version of the packet are the same, so they are
stored whenever either version of the packet is acquired.
In 525-line text, each packet 26 only contains ten 24/18
Hamming encoded data triplets, rather than the 13 found
in 625-line text. The tabulation bit is used as an extra bit
(theMSB)ofthedesignationcode,allowing32 packet 26s
to be transmitted for each page. The last byte of each
packet 26 is ignored.
handbook, full pagewidth
GSA004
Row 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
0678
9023
39
Packet X/0/0OSD only Rolling time
aw/ag Packet X/0/1 Packet X/1/1
Packet X/0/2
Packet X/0/3
Packet X/0/4 Packet X/1/4
Packet X/0/5
Packet X/0/6
Packet X/0/7
Packet X/0/8 Packet X/1/8
Packet X/0/9
Packet X/0/10
Packet X/0/11
Packet X/0/12 Packet X/1/12
Packet X/0/13
Packet X/0/14
Packet X/0/15
Packet X/0/16 Packet X/1/16
Packet X/0/17
Packet X/0/18
Packet X/0/19
Packet X/0/20 Packet X/1/20
Packet X/0/21
Packet X/0/22
Packet X/0/23
Packet X/0/24(1) Packet X/1 /24(1)
Control Data 10(2)
Fig.22 Packet storage locations, 525-line.
(1) If X24 POSN bit = 1.
(2) Byte 10 reserved.
2001 Feb 13 64
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
22.1.6.9 Fastext detection
When a packet 27, designation code 0 is detected,
whether or not it is acquired, bit TXT13.FASTEXT is set.
If the device is receiving 525-line Teletext, a
packet X/0/27/0 is required to set the flag. The flag can be
reset by writing a logic 0 into the SFR bit.
When a packet 8/30 is detected (or a packet 4/30 when
the device is receiving a 525-line transmission),
flag TXT13.PKT 8/30 is set. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.6.10 Broadcast Service Data Detection
When a packet 8/30 is detected (or a packet 4/30 when
the device is receiving a 525-line transmission),
flag TXT13. PKT 8/30 is set. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.6.11 VPS acquisition
When bit TXT0.VPS ON is set, any VPS data present on
line 16, field 0 of the CVBS signal at the input of the
Teletext decoder is error checked and stored in row 25,
block 9 of the basic page memory, see Fig.23. The device
automatically detects whether Teletext or VPS is being
transmitted on this line and decodes the data
appropriately.
Each VPS byte in the memory consists of four biphase
decoded data bits (bits 0 to 3), a biphase error flag (bit 4)
and three logic 0s (bits 5 to 7).
The most significant bit of the VPS data cannot be set to
logic 1.
Bit TXT13.VPSReceivedis set bythehardwarewhenever
VPS data is acquired.
Full details of the VPS system can be found in the
specification
“Domestic Video Program Delivery Control
System (PDC); EBU Tech. 3262-E”.
22.1.7 WST ACQUISITION
The SAA56xx family is capable of acquiring Level 1.5
625-line and 525-line World System Teletext.
22.1.8 WSS ACQUISITION
The WSS data transmitted on line 23 gives information on
the aspect ratio and display position of the transmitted
picture, the position of subtitles and on the camera/film
mode. Some additional bits are reserved for future use.
A total of 14 data bits are transmitted.
All of the available data bits transmitted by the WSS signal
are captured and stored in SFRs WSS1, WSS2 and
WSS3. The bits are stored as groups of related bits and an
error flag is provided for each group to indicate when a
transmissionerrorhasbeendetectedinoneor more of the
bits in the group.
WSS data is only acquired when the TXT8.WSS ON bit is
set. Bit TXT8.WSS RECEIVED is set by the hardware
whenever WSS data is acquired. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.9 CLOSED CAPTION ACQUISITION
The US Closed Caption data is transmitted on line 21
(525-line timings) and is used for Captioning information,
Text information and Extended Data Services. Full details
canbefound in the document
“RecommendedPractisefor
Line 21 Data Service EIA-608”
. Closed Caption data is
only acquired when bit TXT21.CC ON is set.
Two bytes of data are stored per field in SFRs. The first
byte is stored in CCDAT1 and the second byte is stored in
CCDAT2. The value in the CCDAT registers is reset to
00H at the start of the Closed Caption line defined by
CCLIN.CS<4:0>. At the end of the Closed Caption line, an
interrupt is generated if IEN0.ECC is active.
The Closed Caption data is software-processed to convert
it into a displayable format.
handbook, full pagewidth
teletext page
header data VPS
byte 11
row 25
10 11
column
09
MBK964
VPS
byte 12 VPS
byte 13 VPS
byte 14 VPS
byte 15 VPS
byte 4 VPS
byte 5
12 13 14 15 16 17 18 19 20 21 22 23
Fig.23 VPS data storage.
2001 Feb 13 65
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23 DISPLAY
The display section (see Fig.24) is based on the
requirements for a Level 1.5 WST Teletext and US Closed
Caption. There are some enhancements for use with
locally generated on-screen displays.
The display section reads the contents of the Display
memory and interprets the control/character codes. From
this information and other global settings, the display
produces the required RGB signals and Video/Data (Fast
Blanking) signal for a TV signal processing device.
The display is synchronized to the TV signal processing
device by horizontal and vertical sync signals from
externalcircuits(SlaveSync mode). All displaytimingsare
derived from these signals.
The SAA56xx display section incorporates a number of
enhancements over the rest of the SAA55xx family,
including 100 Hz (2H/2V only) operation, two page mode
(50/60 Hz only), increased DRCS/Special Graphics and a
larger Character ROM.
handbook, full pagewidth
MICROPROCESSOR
INTERFACE
DISPLAY
TIMING
HSYNC VSYNC
CHARACTER
FONT
ADDRESSING
address
data
data
address
address
data
data
address
data
control
to memory interface
from memory interface
PHASE
SELECTOR
FUNCTION REGISTERS
FOR PAGE A AND PAGE B
PAGE B
PARALLEL/SERIAL
CONVERTER WITH
SMOOTHING AND FRINGING
ATTRIBUTE HANDLING
FOR PAGE A AND PAGE B
CLUT RAM
DISPLAY DATA ADDRESSING
FOR PAGE A AND PAGE B
GSA062
CLK
12/24 MHz display
CHARACTER
ROM
AND
DRCs
DATA
BUFFER
DAC DACDAC
GBFBR
Fig.24 Display block diagram.
2001 Feb 13 66
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.1 Display features
•Teletext and Enhanced OSD modes
•Level 1.5 WST features
•US Closed Caption features
•50/60 Hz or 100/120 Hz display timing modes
•Two page operation (50/60 Hz only)
•Serial and parallel display attributes
•Single/double/quadruple width and height for characters
•Smoothing capability of double size, double width,
double height and quadruple size characters
•Scrolling of display region
•Variable flash rate controlled by software
•Globally selectable scan lines per row 9/10/13/16
•Globally selectable character matrix (H ×V) 12 ×9,
12 ×10, 12 ×13 and 12 ×16
•Italics
•Soft colours using CLUT with 4096 colour palette
•Underline
•Overline
•Fringing (shadow) selectable from N-S-E-W direction
•Fringe colour selectable
•Meshing of defined area
•Contrast reduction of defined area (both CC and
Teletext display modes
•Cursor
•Special graphics characters with two planes, allowing
four colours per character
•64 software redefinable OSD characters
•Up to 4 WST character sets (G0/G2) user
programmable in a single device (e.g. Latin, Cyrillic,
Greek and Arabic)
•G1 Mosaic graphics, Limited G3 Line drawing
characters
•WST character sets and Closed Caption character set
user programmable in a single device.
23.2 Display modes
The display section has two distinct modes with different
features available in each:
•TXT: This is the WST mode with additional serial and
global attributes. A TXT window is configured as a fixed
25 rows with 40 characters per row.
•CC: This is the US Closed Caption mode. A CC window
is configured as a maximum of 16 rows with a maximum
of 48 characters per row.
In both of the above modes, the character matrix and
TV lines per row can be defined. There is an option of a
character matrix (H ×V) of 12 ×9, 12 ×10, 12 ×13, or
12 ×16, which have 9, 10, 13 and 16 TV lines per display
row, respectively.
Table 25 gives the possible number of display rows for
each combination, as allowed by the hardware.
Table 25 Maximum number of display rows
SFR TXT21 and memory mapped registers are used to
control the mode selection. The features will now be
described and their function in each of the modes given.
If the feature is different in either mode then this is stated.
CHARACTER
MATRIX MAX NUMBER OF DISPLAY ROWS
TXT 625 TXT 525 CC
12 x 9 25 25 16
12 x 10 25 23 16
12 x 13 21 18 16
12 x 16 17 14 14
2001 Feb 13 67
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.2.1 FEATURES AVAILABLE AND CHARACTERS IN EACH MODE
Table 26showsalistoffeaturesavailableineachmode, and also if the setting is a serial/parallel attribute, or has a global
effect on all the display.
Table 26 Display features and characters in each mode
FEATURE TXT CC
Flash serial serial
Boxes TXT/OSD (serial) serial
Horizontal size ×1, ×2 or ×4 (serial) ×1 or ×2 (serial)
Vertical size ×1 or ×2 (serial); ×4 (global) ×1 or ×2 (serial)
Italic n/a serial
Foreground colours 8 (serial) 8 + 8 (parallel)
Background colours 8 (serial) 16 (serial)
Soft colours (CLUT) 16 from 4096 16 from 4096
Underline n/a serial
Overline n/a serial
Fringe N + S+E+W N+S+E+W
Fringe colour 16 (global) 16 (serial)
Meshing of background black or colour (global) all (global)
Fast Blanking Polarity yes yes
Screen colour 16 (global) 16 (global)
DRCS 64 (global) 64 (global)
Character matrix (H ×V) 12 ×9, 12 ×10, 12 ×13 or 12 ×16 12 ×9, 12 ×10, 12 ×13 or 12 ×16
Number of rows 25 16
Number of columns 40 48
Number of characters displayable 1000 768
Cursor yes yes
Special graphics (2 planes per
character) 32 32 (default), 128 if extended special
graphics on
Scroll no yes
Smoothing yes (global) yes (global)
Contrast reduction yes (global) yes (serial)
2001 Feb 13 68
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.3 Display timing modes
The display can be configured for either 50/60 Hz or 100/120 Hz (2H/2V only) using the display configuration
MMR 87FFH.
Table 27 Display timing modes
DISPLAY TIMING
(MMR 87FFH) SUPPORTED
HSYNC/VSYNC RATE DISPLAY CLOCK NUMBER OF CHARACTERS
100 HZ BIT TWO_PAGE BIT
0 0 1H/1V 12 MHz 40 (single window)
X 1 1H/1V 24 MHz 80 (double window)
1 0 1H/1V; 2H/2V 24 MHz 40 (single window)
23.3.1 DOUBLE WINDOW OPERATION
This mode enables two different pages to be displayed
side-by-side for use with 16:9 TV screens. The display
section clock runs at 24 MHz in this mode. Fig.25 shows
the combination of two page display possible on the
SAA56xx device.
Two page mode is selected using MMR 87FFH bit 0. The
two pages displayed are separated by two character
spaces to allow the display logic to switch correctly from
one window to the other. The facility is restricted to 1H/1V
(i.e. 50/60Hz display TVs).
Two control bits exist in double window mode to select
Closed Caption display or text display in each window:
TXT21.CC/TXT for Page A and TXT28.CC_TXT B for
Page B.
TXT:Whendisplaying twoTeletextpagesside byside,the
memory block being displayed in Page A is selected using
SFR TXT14<3:0>andforPage Busing SFR TXT28<3:0>.
The Data Capture section writes the header and time
information only to the memory block corresponding to the
active page. This active page is determined with the
TXT28.ACTIVE PAGE bit. When set to logic 0, Page A is
active, set to logic 1, Page B is active.
Operation of the REVEAL bit (TXT7.5) and CURSOR ON
bit (TXT7.6) only affects the active page.
CC: WhenCCdisplaymodeisselectedintwopagemode,
only one window may be used for CC/OSD and the other
eitherText or Video. Two page CC display (either captions
or OSD) side-by-side is not possible because there is only
one area of memory available for the CC data.
23.3.2 SINGLE WINDOW OPERATION
At reset, the device defaults to single window mode, which
correspondsto87FFH bit 0setto logic 0. In this mode, the
settings applying to the window displayed are those that
would apply to Page A in double window mode.
For 2H/2V display TVs, the 100 Hz bit, MMR 87FFH bit 1,
must be set to logic 1 to fit a whole display window.
For 1H/1V display TVs, when MMR 87FFH bit 1 is set to
logic 0, the display window occupies the whole screen,
whereas if MMR 87FFH bit 1 is set to logic 1, only half the
screen would be occupied by the display window. This
latter configuration would give the same kind of display as
in the double window mode with Page A: CC or
Text Page B: Video.
2001 Feb 13 69
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
o
k, full pagewidth
GSA077
CC
OSD
Page A
Screen Colour Area
Text
Page B Page A
Screen Colour Area
Text
Page B
CC
OSD
Page A
Screen Colour Area
CC
Page B Page A
Screen Colour Area
VideoVideo
Page B
CC
OSD
Page A
Screen Colour Area
VideoText
Page B Page A
Screen Colour Area
Text Text
Page B
Page A
Screen Colour Area
Text
Page B
Text
OSD
Page A
Screen Colour Area
Text
Page B
Text
Subtitle
Video
Page A Text
OSD
Page B
Screen Colour Area
CC
Page A
Video
Page B
Screen Colour Area
Text
Subtitle
Page A
Text
Page B
Screen Colour Area
Text
OSD
Page A
Video
Page B
Screen Colour Area
CC
OSD
Page A
Video
Page B
Screen Colour Area
Page A
Screen Colour Area
Text
OSD
Page B
Text
OSD
Fig.25 Two-page Text/CC/video combinations.
2001 Feb 13 70
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4 Display feature descriptions
All display features are now described in detail for both
TXT and CC modes.
23.4.1 FLASH
Flashing causes the foreground colour pixels to be
displayedasthebackground pixels. The flashfrequencyis
controlled by software setting and resetting the MMR
Status (see Table 41) at the appropriate interval.
CC: This attribute is valid from the time set (see Table 33)
until the end of the row of a display window, or until
otherwise modified.
TXT: This attribute is set by the control character ‘flash’
(08H) (see Fig.34) and remains valid until the end of a row
of a display window, or until reset by the control character
‘steady’ (09H).
23.4.2 BOXES
CC: This attribute is valid from the time set until the end of
a row of a display window, or otherwise modified if set with
Serial Mode 0. If set with Serial Mode 1, then it is set from
the next character onwards.
In text mode (within CC mode), the background colour is
displayed regardless of the setting of the box attribute bit.
Boxes take effect only during mixed mode. Where boxes
are set in this mode, the background colour is displayed.
Character locations where boxes are not set show
video/screen colour (depending on the setting in the MMR
Display Control) instead of the background colour.
TXT: Two types of boxes exist: the Teletext box and the
OSD box. The Teletext box is activated by the ‘start box’
control character (0BH), Two start box characters are
required to begin a Teletext box, with the box starting
between the two characters. The box ends at the end of
the line or after an ‘end box’ control character.
TXT mode can also use OSD boxes, which are started
using size implying OSD control characters
(BCH/BDH/BEH/BFH). The box starts after the control
character (set after) and ends either at the end of a row of
a display window, or at the next size implying
OSD character (set at).
The attributes flash, Teletext box, conceal, separate
graphics, twist and hold graphics are all reset at the start
of an OSD box, as they are at the start of the row.
OSD boxes are only valid in TV mode, which is defined by
TXT5 = 03H and TXT6 = 03H.
23.4.3 SIZE
The size of the characters can be modified in both the
horizontal and vertical directions.
CC: Two sizes are available in both the horizontal and
vertical directions. The sizes available are normal (×1),
double (×2) height/width and any combination of these.
The attribute setting is always valid for the whole row of a
display window. Mixing of sizes within a row is not
possible.
TXT: Three horizontal sizes are available: normal (×1),
double (×2), quadruple (×4). The control characters
‘normal size’ (0CH/BCH) enable normal size. The ‘double
width’ or double size (0EH/BEH/0FH/BFH) control
characters enable double width characters.
Any two consecutive combinations of ‘double width’ or
‘double size’ (0EH/BEH/0FH/BFH) control characters
activate quadruple width characters, provided quadruple
width characters are enabled by TXT4.QUAD WIDTH
ENABLE.
Three vertical sizes are available normal (×1), double (×2)
and quadruple (×4). The control characters ‘normal size’
(0CH/BCH) enable normal size, the ‘double height’ or
‘double size’ (0DH/BDH/0FH/BFH) enable double height
characters. Quadruple height characters are achieved by
using double height characters and setting the global
attributes TXT7.DOUBLE HEIGHT (expand) and
TXT7.BOTTOM/TOP.
If double height characters are used in Teletext mode,
single height characters in the lower row of the double
height character are automatically disabled.
23.4.4 ITALIC
CC: This attribute is valid from the time set until the end of
a row of a display window, or otherwise modified. The
attribute causes the character foreground pixels to be
offset horizontally by 1 pixel per 4 scan lines (interlaced
mode). The base is the bottom left character matrix pixel.
The pattern of the character is indented, as shown in
Fig.26.
TXT: The Italic attribute is not available.
2001 Feb 13 71
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
0
0
1
3
5
7
8
9
10
Field 1
12 × 16 character matrix 12 × 13 character matrix
indented by 7/6/4
indented by 6/5/3
indented by 5/4/2
indented by 4/3/1
indented by 3/2/0
indented by 2/1
indented by 1/0
MBK970
Field 2
11
12
13
14
15
2
2
4
4
6
6
8100 2 4 6 810
indented by 0
02468100246810
12 × 10 character matrix
02468100246810
Fig.26 Italic characters.
23.4.5 COLOURS
A Colour Look-Up Table (CLUT) with 16 colour entries is
provided. The colours can be programmed from a palette
of4096(4 bitsper R, G and B), asshowninTable 28.The
CLUT is defined by writing data to a RAM that resides in
the MOVX address space of the 80C51. When set, the
colours are global and apply to all display windows.
Table 28 CLUT colour values
23.4.6 FOREGROUND COLOUR
CC: The foreground colour can be chosen from eight
colours on a character by character basis. Two sets of
eight colours are provided. A serial attribute switches
between the banks (see Table 33 Serial Mode 1, bit 7).
The colours are the CLUT entries 0 to 7 or 8 to 15.
TXT: The foreground colour is selected via a control
character(seeFig.32).Thecolour controlcharacterstakes
effect at the start of the next character (‘set after’) and
remain valid until the end of a row of a display window, or
untilmodified byacontrolcharacter. Onlyeightforeground
colours are available.
The TEXT foreground control characters map to the CLUT
entries, as shown in Table 29.
Table 29 Foreground CLUT mapping
RED<3:0>
(B11 TO B8) GREEN<3:0>
(B7 TO B4) BLUE<3:0>
(B3 TO B0) COLOUR
ENTRY
0000 0000 0000 0
0000 0000 1111 1
... ... ... ...
1111 1111 0000 14
1111 1111 1111 15
CONTROL
CODE DEFINED
COLOUR CLUT ENTRY
00H black 0
01H red 1
02H green 2
03H yellow 3
04H blue 4
05H magenta 5
06H cyan 6
07H white 7
2001 Feb 13 72
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.7 BACKGROUND COLOUR
CC: This attribute is valid from the time set until the end of
a row of a display window, or otherwise modified if set with
Serial Mode 0. If set with Serial Mode 1, then the colour is
set from the next character onwards.
The background colour can be chosen from all 16 CLUT
entries.
TXT: The control character ‘New background’ (1DH) is
used to change the background colour to the current
foreground colour. The selection is immediate (set at) and
remains valid until the end of a row of a display window, or
until otherwise modified.
The TEXT background control characters map to the
CLUT entries, as shown in Table 30.
Table 30 Background CLUT mapping
23.4.8 BACKGROUND DURATION
When set, the attribute takes effect from the current
position until the end of the display window. This is defined
in the MMR Text Area End in single window mode and in
doublewindow modeforPage A,withMMR TextAreaEnd
B for Page B.
CC: The background duration attribute (see Table 33,
bit 8) in combination with the End Of Row attribute (see
Table 33, bit 9) forces the background colour to be
displayed on the row until the end of the text area is
reached.
TXT: This attribute is not available.
23.4.9 UNDERLINE
The underline attribute causes the characters to have the
bottom scan line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then underline is set until the end of the display window.
CC: The underline attribute (see Table 33, bit 4) is valid
from the time set until the end of row of a display window,
or otherwise modified.
TXT: This attribute is not available.
23.4.10 OVERLINE
The overline attribute causes the characters to have the
top scan line of the character cell forced to foreground
colour, including spaces. If background duration is set,
then overline is set until the end of the display window.
CC: The overline attribute (see Table 33, bit 5) is valid
fromthetimesetuntilthe end of a row of a display window,
or otherwise modified. Overlining of italic characters is not
possible.
TXT: This attribute is not available.
23.4.11 END OF ROW
CC: The number of characters in a row is flexible and can
be determined by the end of row attribute (see Table 33,
bit 9). However, the maximum number of character
positions displayed is determined by the setting of the
MMR Text Area Start or Text Area Start B, and MMR Text
Area End or Text Area End B.
Note that, when using the end of row attribute, the next
character location after the attribute should always be
occupied by a ‘space’.
TXT: This attribute is not available, the row length is fixed
at 40 characters.
CONTROL
CODE DEFINED
COLOUR CLUT ENTRY
00H + 1DH black 8
01H + 1DH red 9
02H + 1DH green 10
03H + 1DH yellow 11
04H + 1DH blue 12
05H + 1DH magenta 13
06H + 1DH cyan 14
07H + 1DH white 15
2001 Feb 13 73
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.12 FRINGING
A fringe (shadow) can be defined around characters. The
fringe direction is individually selectable in any of the
North, South, East and West directions using the MMR
Fringing Control.
The colour of the fringe can also be defined as one of the
entries in the CLUT, again using MMR Fringing Control.
An example of fringing is shown in Fig.27.
CC: The fringe attribute (see Table 33, bit 9) is valid from
the time set until the end of a row of a display window, or
otherwise modified.
TXT: Bit TXT4.SHADOW ENABLE controls the display of
fringing in single page mode and in double Page A.
Bit TXT26.SHADOW ENABLE B controls the display of
fringing for Page B in double window mode.
Whenset, allthealphanumericcharactersbeing displayed
are shadowed, graphics characters are not shadowed.
handbook, full pagewidth
MBK972
Fig.27 South and south-west fringing.
23.4.13 MESHING
This attribute affects the background colour being
displayed. Alternate pixels are displayed as the
background colour or video. The structure is offset by one
pixel from scan line to scan line, thus achieving a checker
board display of the background colour and video.
An example of meshing and meshing/fringing is shown in
Fig.28.
CC: The setting of the MSH bit in MMR Display Control
has the effect of meshing any background colour.
TXT: There are two meshing attributes. One only affects
black background colours TXT4.B MESH ENABLE in
single window mode or in double window mode for
Page A, and TXT26.B MESH ENABLE B for Page B.
A second only affects backgrounds other than black
TXT4.C MESH ENABLE in single window mode or in
double window mode for Page A, and
TXT26.C MESH ENABLE B for Page B. A black
background is defined as CLUT entry 8, a non-black
background is defined as CLUT entry 9 to 15.
2001 Feb 13 74
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
MBK973
Fig.28 Meshing and meshing/fringing (south + west).Fig.0 Meshing and meshing/fringing (south + west).
23.4.14 CURSOR
The cursor operates by reversing the background
(see Fig.29) and foreground colours in the character
position pointed to by the current cursor position in the
active page.
The cursor is enabled using TXT7.CURSOR ON. When
set, the row on which the cursor appears is defined by
TXT9.R<4:0>; the column is defined by TXT10.C<5:0>.
The active page is defined by TXT28.ACTIVE PAGE in
doublewindow modeandthedisplayedwindow isinsingle
window mode. The position of the cursor can be fixed
using TXT9.CURSOR FREEZE.
CC: The valid range for row is 0 to 15. The valid range for
column is 0 to 47. The cursor remains rectangular at all
times, its shape is not affected by italic attribute, therefore
it is not advised to use the cursor with italic characters.
TXT: The valid range for row positioning is 0 to 24. The
valid range for column is 0 to 39.
handbook, full pagewidth
MBK971
ABCDEF
Fig.29 Cursor display.
2001 Feb 13 75
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.15 DYNAMICALLY REDEFINABLE CHARACTERS (DRCS)
A number of DRCs are available (see Fig.30). These are
mapped onto the normal character codes, and replace the
predefined Character ROM value.
By default there are 32 DRCs occupying the character
codes 80H to 8FH. The SAA56xx family of devices offers
32 additional DRCs over the SAA55xx by setting TXT26.
The first 16 of them occupy the character codes A0 to AF,
the second 16 occupy the character codes C0 to CF.
The remapping of the standard OSD to the DRCs is
activated when the TXT20.DRCS ENABLE bit for single
page mode or for Page A in double window mode, and
TXT23.DRCS B ENABLE for Page B in double window
mode.
Each character is stored in a matrix of 12 ×16 ×1
(V ×H×planes), this allows for all possible character
matrices to be defined within a single location.
handbook, full pagewidth
GSA063
CHARACTER 46
character 0 address (HEX)
AEH
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
CHARACTER 48 C0H
CHARACTER 49 C1H
CHARACTER 47 AFH
CHARACTER 62 CEH
CHARACTER 63
12 bits
CFH
CHARACTER 30 9EH
CHARACTER 32 A0H
CHARACTER 33 A1H
8BC0
8BDF
CHARACTER 31 9FH
8BE0
additional DRCs
for TXT26.7 = 1
8BFF
CHARACTER 0
address (HEX) character code
80H
CHARACTER 1 81H
CHARACTER 2 82H
8800
881F
8820
883F
8840
885F
Fig.30 Organisation of DRC RAM
The SAA56xx family of devices offers 32 additional DRCs over the SAA55xx by setting TXT26.7. The first 16 of them occupy character codes A0 to AF,
the second 16 occupy character codes C0 to CF.
2001 Feb 13 76
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.16 DEFINING CHARACTERS
The DRC RAM is mapped into the 80C51 RAM address
space and starts at location 8800H. The character matrix
is 12 bits wide and therefore requires two bytes to be
written for each word. The first byte (even addresses),
addresses the lower eight bits and the lower nibble of the
second byte (odd addresses) addresses the upper four
bits.
For characters of 9, 10 or 16 lines high, the pixel
information starts in the first address and continues
sequentially for the required number of addresses.
Charactersof 13 lines high are defined with an initial offset
of one address, to allow for the correct generation of
fringing across boundaries of clustered characters
(see Fig.31). The characters continue sequentially for
13 lines,after whichafurtherlinecan againbeusedforthe
generation of correct fringing across boundaries of
clustered characters.
23.4.17 SPECIAL GRAPHICS CHARACTERS
Several special graphics characters (see Fig.32 for an
example) are provided for improved OSD effects, to
provide a choice of four colours within a character cell, see
Table 31.
Table 31 Special graphics character colour allocation
By default, the colours are stored in the Character ROM
location of character codes 8XH and 9XH of the character
table (32 ROM characters), or in the DRCS RAM.
If TXT26.EXTENDED DRCS is set, the colours are stored
in character codes 8XH, 9XH, AXH and CXH, or in the
DRCs RAM, including the extended location
(64 characters). Each special graphics character uses two
consecutive normal characters.
OSD/TXT: The SAA56xx family of devices allow for
16 special graphics characters if
TXT26.EXTENDED DRCS = 0 and 32 if
TXT26.EXTENDED DRCS = 1. The double plane
decoding for the special graphics is set by
TXT20.OSD PLANES in single window mode or for
Page A in double window mode, or by setting
TXT29.OSD PLANES B for Page B in double window
mode.
OSD/CC:For TXT20.5 = 0,theconditionsarethe sameas
in OSD/TXT mode. For TXT20.5 = 1, any character
location can be used as special graphics using bit 14 of its
parallel code (see Table 32), extended special graphic
attributes.
Remark: Fringing, underline, overline and smoothing are
not possible for special graphics.
If the screen colour is transparent (implicit in mixed mode)
and the box attribute is set inside the object, the object is
surrounded by video. If the box attribute is not set, the
background colour inside the object will also be displayed
as transparent.
handbook, halfpage
line 13 from
character above
line 1 from
character below
top left
pixel
MSB LSB
MBK975
HEX
440
003
00C
030
0C0
300
C00
C00
300
0C0
030
00C
003
000
1A8
000
line
number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
fringing
top line
bottom right
pixel
bottom line
fringing
line not used
Fig.31 13-line high DRCs character format.
PLANE 1 PLANE 0 COLOUR ALLOCATION
0 0 background colour
0 1 foreground colour
1 0 CLUT entry 6
1 1 CLUT entry 7
2001 Feb 13 77
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
MGK550
VOLUME
background colour
"set at" (Mode 0) background colour
"set after" (Mode 1)
serial attribute
foreground colour 7
background colour
special character
foreground colour
normal character foreground colour 6
Fig.32 Example of a special graphics character.
This example could also be done with 8 special characters.
2001 Feb 13 78
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.18 SMOOTHING
To improve the appearance of the display, the SAA56xx
family of devices incorporates a smoothing algorithm to
insert extra pixels for all character sizes other than normal
size (see Fig.33). Smoothing is available in both TXT and
CC modes.
MMR 87E4H bit 4enablessmoothing insinglepage mode
andforPage A in doublewindowmode.MMR 87E4H bit 5
enables smoothing for Page B in double window mode.
The appearance of special graphics characters and
fringed characters cannot be improved with the smoothing
algorithm.
handbook, full pagewidth
GSA078
normal size
double width smoothing on
double size smoothing ondouble height smoothing on
double width smoothing off
double size smoothing offdouble height smoothing off
Fig.33 Smoothing characters.
2001 Feb 13 79
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.4.19 CONTRAST REDUCTION
The device can act on the TV’s display circuit to reduce
contrast of the video by driving the COR output LOW.
Contrast reduction improves the readability of characters
in mixed mode.
TXT: Bits COR IN in SFRs TXT5 and TXT6 control when
theCORoutputof thedevice isactivated.Thesebitsallow,
for example, the display to be set-up so that the areas
inside Teletext boxes are contrast reduced when a subtitle
is displayed, leaving the rest of the screen displayed as in
normal conditions.
CC: Here, the contrast reduction is controlled by the
contrastreduction attribute(seeTable 33).Thisattribute is
valid from the time set until the end of a row of a display
window, or otherwise modified if set with Serial Mode 0.
If set with Serial Mode 1, it is set from the next character
onwards.
23.5 Character and attribute coding
This section describes the character and attribute coding
for each mode.
23.5.1 CC MODE
Character coding is split into character oriented attributes
(parallel, see Table 32) and character group coding
(serial, see Table 33). The serial attributes take effect
either at the position of the attribute (set at), or at the
following location (set after) and remain effective until
either modified by a new serial attribute or until the end of
a row of a display window. A serial attribute is represented
as a space (the space character itself however is not used
for this purpose). The attributes that are still active,
e.g. overline and underline, are visible during the display
of the space.
The default setting at the start of a row is:
•1× size
•Flash off
•Overline off
•Underline off
•Italics off
•Display mode = superimpose
•Fringing off
•Background colour duration = 0
•End of row = 0.
The coding is done in 15-bit words. The codes are stored
sequentially in the Display memory. A maximum of
768 character positions can be defined for a single display.
23.5.2 TXT MODE
Character coding is in a serial format, with only one
attribute being changed at any single location. The serial
attributes take effect either at the position of the attribute
(set at), or at the following location (set after). The attribute
remains effective until either modified by new serial
attributes or until the end of a row of a display window.
The default settings at the start of a row are:
•Foreground colour white (CLUT address 7)
•Background colour black (CLUT address 8)
•Horizontal size ×1, vertical size ×1 (normal size)
•Alphanumeric on
•Contiguous Mosaic Graphics
•Release Mosaics
•Flash off
•Box off
•Conceal off
•Twist off.
The attributes have individual codes which are defined in
the basic character table (see Fig.34).
23.5.3 PARALLEL CHARACTER CODING
Table 32 Parallel character coding
BITS DESCRIPTION
0 to 7 8-bit character code
8 to 10 three bits for eight foreground colours
11 mode bit: 0 = parallel code
12 to 13 character set selection
14 special graphics
2001 Feb 13 80
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.5.4 SERIAL CHARACTER CODING
Table 33 Serial character coding
BITS
DESCRIPTION
SERIAL MODE 0 (‘SET AT’) SERIAL MODE 1
CHAR.POS. 1 (‘SET AT’) CHAR.POS. >1 (‘SET AFTER’)
0 to 3 4 bits for 16 background colours 4 bits for 16 background colours 4 bits for 16 background colours
4 Underline switch: Horizontal size: Underline switch:
0 = Underline off 0 = normal 0 = Underline off
1 = Underline on 1 = ×2 1 = Underline on
5 Overline switch: Vertical size: Overline switch:
0 = Overline off 0 = normal 0 = Overline off
1 = Overline on 1 = ×2 1 = Overline on
6 Display mode: Display mode: Display mode:
0 = Superimpose 0 = Superimpose 0 = Superimpose
1 = Boxing 1 = Boxing 1 = Boxing
7 Flash switch: Foreground colour switch: Foreground colour switch:
0 = Flash off 0 = Bank 0 (colours 0 to 7) 0 = Bank 0 (colours 0 to 7)
1 = Flash on 1 = Bank 1 (colours 8 to 15) 1 = Bank 1 (colours 8 to 15)
8 Italic switch: Background colour duration: Background colour duration (set at):
0 = Italics off 0 = stop BGC 0 = stop BGC
1 = Italics on 1 = set BGC to end of row 1 = set BGC to end of row
9 Fringing switch: End of Row End of Row (set at):
0 = Fringing off 0 = Continue Row 0 = Continue Row
1 = Fringing on 1 = End Row: 1 = End Row
10 Switch for serial coding: Switch for serial coding: Switch for serial coding:
0 = Mode 0 0 = Mode 0 0 = Mode 0
1 = Mode 1 1 = Mode 1 1 = Mode 1
11 Mode bit: Mode bit: Mode bit:
1 = serial code 1 = serial code 1 = serial code
12 Contrast switch: Contrast switch: Contrast switch:
0 = contrast reduction off 0 = contrast reduction off 0 = contrast reduction off
1 = contrast reduction on 1 = contrast reduction on 1 = contrast reduction on
2001 Feb 13 81
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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handbook, full pagewidth
GSA089
normal
height
b3b2b1b0
b4
b5
b6
b7
0 1 2 2a 3 3a 4 5 6 6a 7 7a 8 8a 9a9C
column
r
o
w
B
I
T
S
0
0
0
0
0
0
0
1
0
10
0
0
10
1
1
00
0
1
00
1
A
1
01
0
1
10
0
0
1
1
0
0
0
1
1
0
0
1
0
0
1
1
1
E1 1 1 0 double
width hold
graphics
F1 1 1 1 double
size release
graphics
B1 0 1 1 start box twist
C1 1 0 0 black
back -
ground
D1 1 0 1 double
height
new
back -
ground
A1 0 1 0 end box separated
graphics
91 0 0 1 steady contiguous
graphics
8
1 0 0 0 flash conceal
display
70 1 1 1 alpha
white graphics
white
60 1 1 0 alpha
cyan graphics
cyan
5
0 1 0 1 alpha
magenta graphics
magenta
40 1 0 0 alpha
blue graphics
blue
30 0 1 1 alpha
yellow graphics
yellow
2
0 0 1 0 alpha
green graphics
green
0
0 0 0 0 alpha
black graphics
black
10 0 0 1 alpha
red graphics
red
B
1
0
1
1
DEF
1
1
0
1
1
1
1
0
1
1
1
1
DEF
1
1
0
1
1
1
1
0
1
1
1
1
double
width
OSD
double
size
OSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSDOSD
OSD
E/W = 0 E/W = 1
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
OSD
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
nat
opt
normal
size
OSD
double
height
OSD
back-
ground
white
back-
ground
cyan
back-
ground
magenta
back-
ground
blue
back-
ground
yellow
back-
ground
green
back-
ground
black
back
ground
red
OSD
character dependent on the language of page, refer to National Option characters
customer definable On-Screen Display character
Fig.34 TXT basic character set (Pan-European).
2001 Feb 13 82
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.6 Screen and global controls
A number of attributes are available that affect the whole
display region of a display window, and cannot be applied
selectively to regions of the display.
23.6.1 TV SCAN LINES PER ROW
The number of TV scan lines per field used for each
displayrowcanbedefined,thevalue is independent of the
character size being used. The number of lines can be 10,
13 or 16 per display row. The number of TV scan lines per
row is defined by TXT21.DISP LINES<1:0>.
A value of nine lines per row can be achieved if the display
is forced into 525-line display mode by
TXT17.FORCE DISP<1:0>, or if the device is in 10-line
mode and the automatic detection circuit within display
finds 525-line display syncs.
The number of TV lines per row is then set for both the
display windows in double window mode.
23.6.2 CHARACTER MATRIX (H ×V)
There are three different character matrices available:
12 ×10, 12 ×13 and 12 ×16. The selection is made using
TXT21.CHAR SIZE<1:0> and is independent of the
number of display lines per row.
If the character matrix is less than the number of TV scan
lines per row, the matrix is padded with blank lines. If the
character matrix is greater than the number of TV scan
lines, the character is truncated.
The character matrix is set for all display windows.
23.6.3 DISPLAY MODES
CC: When the superimpose or boxing attribute (see
Table 33, Serial Mode 0/1, bit 6) is set, the resulting
display depends on the setting of the following screen
control mode bits in the MMR Display Control
(see Table 34).
TXT: The display mode is controlled by the bits in TXT5
and TXT6 in single window mode or for Page A in double
window mode, and by the bits in bytes TXT24 and TXT25
in Page B in double window mode. There are three control
functions: Text on, Background on and Picture on
(see Table 35). Separate sets of bits are used inside and
outside Teletext boxes so that different display modes can
be invoked. Bit(s) TXT6 and/or TXT25 are used if the
newsflash (C5) or subtitle (C6) bits in row 25 of the basic
pagememoryare set; otherwise,byte TXT5and/orTXT24
is/are used. This allows the software to set up the type of
display required on newsflash and subtitle pages (e.g. text
inside boxes, TV picture outside). This will be invoked
without any further software intervention when such a
page is acquired.
When Teletext box control characters are present in the
displaypagememory,the appropriate Box control bit must
be set, TXT<n>.Box ON 0 (B),
TXT<n>.Box ON Row 1−23 (B), TXT<n>.Box ON 24 (B)
where <n> is:
•7 in single page mode or for Page A in double window
mode
•26 for double window mode for Page B.
This allows the display mode to be different inside the
Teletext box compared to outside. These control bits are
present to allow boxes in certain areas of the screen to be
disabled. The use of Teletext boxes for OSD messages
has been superseded in this device by the OSD box
concept. However, these bits remain to allow Teletext
boxes to be used, if required.
Table 34 Selection of display modes
MOD1 MOD0 DISPLAY MODE DESCRIPTION
0 0 Video Disables all display activities, sets the RGB to true black and VDS to video.
0 1 Full Text Displays screen colour at all locations not covered by character foreground
or background colour. The box attribute has no effect.
1 0 Mixed Screen Colour Displays screen colour at all locations not covered by character foreground,
within boxed areas or, background colour.
1 1 Mixed Video Displays video at all locations not covered by character foreground, within
boxed areas or, background colour.
2001 Feb 13 83
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Table 35 TXT display control bits
PICTURE ON TEXT ON BACKGROUND ON EFFECT
0 0 X Text mode, black screen
0 1 0 Text mode, background always black
0 1 1 Text mode
1 0 X Video mode
1 1 0 Mixed text and TV mode
1 1 1 Text mode, TV picture outside text area
23.7 Screen colour
Screen colour is displayed from 10.5 to 62.5 ms after the
active edge of the HSYNC input, on TV lines 23 to 310
inclusive for a 625-line display, and on TV lines 17 to 260
inclusive for a 525-line display.
CC: The screen colour is defined by the MMR Display
Control and points to a location in the CLUT table. The
screen colour covers the full video width. It is visible when
the Full Text or Mixed Screen Colour mode is set and no
foreground or background pixels are being displayed.
TXT: Register bits TXT17.SCREEN COL<2:0> can be
used to define a colour to be displayed instead of
TV picture and the black background colour. If the bits are
allsetto zero,thescreencolourisdefinedas ‘transparent’,
and TV picture and background colour are displayed as
normal. Otherwise, the bits define CLUT entries 9 to 15.
In double window mode, TXT17.SCREEN COL<2:0>
applies to Text Area A and TXT27.SCRB<2:0> applies to
Text Area B.
23.8 Text display controls
23.8.1 TEXT DISPLAY CONFIGURATION (CC MODE)
Twotypesof areasarepossible.The oneareais static and
the other is dynamic. The dynamic area allows scrolling of
a region to take place. The areas cannot cross each other.
Only one scroll region is possible.
23.8.2 DISPLAY MAP
The display map (see Fig.35) allows a flexible allocation of
data in the memory to individual rows.
Sixteen words are provided in the Display memory for this
purpose. The lower ten bits address the first word in the
memory where the row data starts. This value is an offset
in terms of 16-bit words from the start of Display memory
(8000H).Themostsignificant bitenablesthedisplaywhen
not within the scroll (dynamic) area (see Table 36).
The display memory map is fixed at the first 16 words in
the Closed Caption Display memory.
Table 36 Display map bit allocation
BIT FUNCTION
11 Text display enable, valid outside Soft Scroll
Area. 0 = disable; 1 = enable.
10 This bit is reserved, should be set to logic 0.
9 to 0 Pointer to row data.
2001 Feb 13 84
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
MBK966
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
3
4
10
11
3
4
9
10
11
12
13
14
15
display
possible
soft scrolling
display possible
display
possible
display
map
entries
display
data
Display memory Text area ROW
Enable
bit = 0
Fig.35 Display memory map and data pointers.
23.9 Soft scroll action
The MMR Scroll Area, MMR Scroll Range, MMR Top
Scroll line and the MMR Status define the dynamic scroll
region. The soft scroll area (see Fig.36) is enabled when
the SCON bit is set in MMR Status. Fig.37 shows the CC
text areas and Fig.38 shows the TXT areas.
Bits SSP<3:0> define the position of the soft scroll area
window and bits SSH<3:0> define the height of the
window. Both are in MMR Scroll Range. Bits STS<3:0>
and bits SPS<3:0> define the rows that are scrolled
through the window. Both are in MMR Scroll Area.
Soft scrolling is done by modifying the Scroll Line value
SCL<3:0> in MMR Top Scroll Line and the first Scroll Row
value SCR<3:0> in the MMR Status.
If the number of rows allocated to the scroll counter is
larger than the defined visible scroll area, parts of rows at
the top and bottom may be displayed during the scroll
function. The registers can be written throughout the field
and the values are updated for display with the next field
sync. Care should be taken that the register pairs are
written to by the software in the same field.
Only a region that contains only single height rows or only
double height rows can be scrolled.
TXT: The display is organised as a fixed size of 25 rows
(0 to 24) of 40 columns (0 to 39), This is the standard size
for Teletext transmissions. The Control Data in row 25 is
not displayed but is used to configure the display page
correctly.
2001 Feb 13 85
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
15
MBK967
14
13
12
11
10
9
8
7
6
5
soft scroll position
pointer SSP<3:0> e.g. 6
soft scroll height
SSH<3:0> e.g. 4 soft scrolling area
usable for
OSD display
usable for
OSD display
should not be used
for OSD display
should not be used
for OSD display
start scroll row
STS<3:0> e.g. 3
start scroll row
SPS<3:0> e.g. 11
4
3
2
1
0
ROW
Fig.36 Soft scroll area.
handbook, full pagewidth
MBK977
ROW
0row0
row1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
row2
row3
row4
row5
row6
row7
Closed Captioning data row n
Closed Captioning data row n+1
Closed Captioning data row n+2
Closed Captioning data row n+3
Closed Captioning data row n+4
row8
row13
visible area
for scrolling
scroll area
offset
0-63
lines
row14
P01 NBC
Fig.37 CC text areas.
2001 Feb 13 86
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
0
9023
39
10
MBK968
control data non-displayable data
byte 10 reserved
Row 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Fig.38 TXT text area.
2001 Feb 13 87
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.10 Display positioning
23.10.1 SINGLE WINDOW MODE
The display consists of the screen colour covering the
whole screen and the text area that is placed within the
visible screen area (see Fig.39).
The screen colour extends over a large vertical and
horizontal range so that no offset is needed. The text area
is offset in both directions relative to the vertical and
horizontal sync pulses.
handbook, full pagewidth
MGL150
56 µs
text area start
0.25 character
offset
horizontal
sync
delay
horizontal sync
vertical
sync
6 lines
offset text
vertical
offset
screen colour
offset = 8 µs
text area end
SCREEN COLOUR AREA
TEXT AREA
Fig.39 Display area positioning.
2001 Feb 13 88
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.10.2 DOUBLE WINDOW MODE
The display (see Fig.40) consists of the two screen
colours covering each half of the screen and two text
areas that are placed within the visible screen area. The
screen colour extends over a large vertical and horizontal
range so that no offset is needed. Both text areas are
offset in both directions relative to the vertical and
horizontal sync pulses.
The second page may be positioned relative to the
HSYNC delay using the Page B Position MMR.
The visible text area for Page A is controlled using the
Text Area Start and Text Area End MMRs. Page B visible
text area is controlled using the Text Area Start B and
Text Area End B MMRs.
handbook, full pagewidth
GSA079
horizontal sync vertical
sync
text
vertical
offset
text area
start A
text area
start B
text area
end B
text area end A
screen colour
offset = 8 µs
56 µs
6 lines
offset
TEXT
AREA A TEXT
AREA B
SCREEN COLOUR AREA
horizontal
sync
delay
0.25 character
offset
0.25 character
offset
min. 2 characters
spaces
Page B start
Fig.40 Page positioning.
2001 Feb 13 89
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.10.3 SCREEN COLOUR DISPLAY AREA
This area is covered by the screen colour, and starts with
a fixed offset of 8 µs from the leading edge of the
horizontal sync pulse in the horizontal direction. A vertical
offset is not necessary. For a summary, see the following:
Horizontal: Start at 8 µs after leading edge of horizontal
sync for 56 µs.
Vertical: Line 9, field 1 (321, field 2) to leading edge of
vertical sync (line numbering using 625 Standard).
23.10.4 TEXT DISPLAY AREA (SINGLE PAGE)
The text area can be defined to start with an offset in both
the horizontal and vertical directions. For a summary, see
following:
Horizontal: Up to 48 full-sized characters per row. Start
position setting from 3 to 64 characters relative to HSYNC
delay. Fine adjustment in quarter characters.
Vertical: 256 Lines (nominal 41 to 297). Start position
setting from leading edge of vertical sync, legal values are
4 to 64 lines (line numbering using 625 Standard).
The horizontal offset is set in MMR Text Area Start. The
offsetis doneinfull-widthcharacters usingTAS<5:0>,with
quartercharactersusingHOP<1:0>forfinesetting.Values
00H to 03H for TAS<5:0> result in a corrupted display.
The width of the text area is defined in the Text Area End
Register by setting the end character value TAE<5:0>.
This number determines where the background colour of
the text area will end if set to extend to the end of the row.
It will also terminate the character fetch process, thus
eliminating the necessity of a row end attribute. However,
this entails writing to all positions.
The vertical offset is set in the Text Position Vertical
Register. The offset value VOL<5:0> is done in number of
TV scan lines.
Note that the Text Position Vertical Register should not be
set to 00H as the Display Busy interrupt is not generated
in these circumstances.
23.10.5 TEXT DISPLAY AREA (TWO_PAGE)
Control of Page A in two page mode is as per the control
in single page mode. Three extra memory mapped
registers control the position of the second page: the Text
Area Start B, Text Area End B and the Page B Position
Register.
Page B positioning register controls the positioning of Text
AreaBrelativetoHSYNC delay. A minimum two character
gap should be allowed between each page to allow the
reset of attributes.
The vertical offset must be the same for both pages, i.e.
RANGE<1:0> and VOL<5:0> = RANGEB<1:0> and
VOLB<5:0> in Text Position Vertical and Vertical Range
Registers (MMR 87F1H, MMR 87E3H and MMR 87E4H).
The text area can be defined to start with an offset in the
horizontal direction, as follows:
•Up to 48 full-sized characters per row. Start position
setting from 3 to 64 characters relative to value in
Page B position register. Fine adjustment in quarter
characters.
•The horizontal offset is set in the Text Area Start
Register. The offset is done in full-width characters
using TAS B<5:0>, with quarter characters using HOP
B<1:0> for fine setting.
•Thewidthof the textareais defined intheTextArea End
Registerbysettingtheendcharacter valueTAE B<5:0>.
This number determines where the background colour
of the Text Area B will end if set to extend to the end of
therow.Itwillalso terminate the character fetch process
thus eliminating the necessity of a row end attribute.
However, this entails writing to all positions.
23.11 Character set
To facilitate the global nature of the device, the character
setcan accommodatealargenumber ofcharacters,which
can be stored in different matrices.
23.11.1 CHARACTER MATRICES
Thecharactermatricesthatcan be accommodated in both
display modes are:
(H ×V×planes) 12 ×9×1, 12 ×10 ×1, 12 ×13 ×1 and
12 ×16 ×1.
These modes allow two colours per character position.
In CC mode, two additional character matrices are
available to allow four colours per character:
(H ×V×planes) 12 ×13 ×2 and 12 ×16 ×2.
The characters are stored physically in ROM in a 12 ×10
or 12 ×16 matrix.
2001 Feb 13 90
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
23.11.2 CHARACTER SET SELECTION
Four character sets are available in the device. A set can
consist of alphanumeric characters, as required by the
WST Teletext or FCC Closed Captioning, Customer
definable OSD characters, and Special Graphic
characters.
CC: Within a Closed Caption information transmission,
only one character set can be used for display. This is
selected using the Basic Set selection TXT18.BS<1:0> in
single window mode and for Page A in double window
mode, and TXT23.BS B<1:0> for Page B in double
window mode. When selecting a character set in
CC mode, the Twist Set selection TXT19.TS<1:0> should
be set to the same value as TXT18.BS<1:0> for correct
operation.
TXT: Two character sets can be displayed at once. These
are the basic G0 set or the alternative G0 set (Twist Set).
The basic set is selected using TXT18.BS<1:0> in single
window mode or for Page A in double window mode, and
TXT23.BS B<1:0> for Page B in double window mode.
ThealternativecharactersetisdefinedbyTXT19.TS<1:0>
insingle windowmodeforPage Ain doublewindowmode,
and TXT29.TS B<6:5> for Page B in double window
mode.
Since the alternative character set is an option, it can be
enabledor disabled usingTXT19.TENfor TXT19.TS<1:0>
and by TXT29.TEN B for TXT29.TS B<6:5>. Also, the
language code that is defined for the alternative set is
defined by TXT19.TC<2:0> for TXT19.TS<1:0> and by
TXT30.TC B<7:6> for TXT29.TS B<6:5>.
The National Option Table is selected using
TXT18.NOT<3:0>. A maximum of 31 National Option
Tables can be defined when combined with the
EAST/WEST control bit located in register TXT4.
In CC OSD mode, characters from the four character sets
canbe displayedonthescreenatthesametime,providing
that all four of the character sets are of the same matrix.
This is done using bits 12 to 13 of the parallel code of the
character (see Table 37).
Table 37 Character set bits coding
23.12 RGB brightness control
A brightness control is provided to adjust the RGB upper
output voltage level. The nominal value is 1 V into a 150 Ω
resistor, but can be varied between 0.7 and 1.2 V.
The brightness is set in the RGB Brightness Register, see
Table 38.
Table 38 RGB brightness
24 MEMORY MAPPED REGISTERS (MMRs)
The memory mapped registers are used to control the
display as for the SAA55xx. Some additional MMRs are
used for the SAA56xx; see Tables 39 to 41.
Table 39 MMR address summary
BITS <13:12> CHARACTER SET
00 set 0
01 set 1
10 set 2
11 set 3
BRI3 TO BRI0 RGB BRIGHTNESS
0000 lowest value
... ...
1111 highest value
REGISTER
NUMBER MEMORY
ADDRESS FUNCTION
0 87F0H Display Control
1 87F1H Text Position Vertical
2 87F2H Text Area Start
3 87F3H Fringing Control
4 87F4H Text Area End
5 87F5H Scroll Area
6 87F6H Scroll Range
7 87F7H RGB Brightness
8 87F8H Status
9 87F9H Reserved
10 87FAH Reserved
11 87FBH Reserved
12 87FCH HSYNC Delay
13 87FDH VSYNC Delay
14 87FEH Top Scroll Line
15 87FFH Configuration
16 87E0H Text Area Start B
17 87E1H Text Area End B
18 87E2H Page B Position
19 87E3H Text Position Vertical B
20 87E4H Vertical Range
2001 Feb 13 91
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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Table 40 MMR map
ADDRESS R/W NAME 7 6 5 4 3 2 1 0 RESET
87F0H R/W Display Control SRC3 SRC2 SRC1 SRC0 −MSH MOD1 MOD0 00H
87F1H R/W Text Position Vertical VPOL HPOL VOL5 VOL4 VOL3 VOL2 VOL1 VOL0 00H
87F2H R/W Text Area Start HOP1 HOP0 TAS5 TAS4 TAS3 TAS2 TAS1 TAS0 00H
87F3H R/W Fringing Control FRC3 FRC2 FRC1 FRC0 FRDN FRDE FRDS FRDW 00H
87F4H R/W Text Area End −−TAE5 TAE4 TAE3 TAE2 TAE1 TAE0 00H
87F5H R/W Scroll Area SSH3 SSH2 SSH1 SSH0 SSP3 SSP2 SSP1 SSP0 00H
87F6H R/W Scroll Range SPS3 SPS2 SPS1 SPS0 STS3 STS2 STS1 STS0 00H
87F7H R/W RGB Brightness VDSPOL −−−BRI3 BRI2 BRI1 BRI0 00H
87F8H R Status BUSY FIELD SCON FLR SCR3 SCR2 SCR1 SCR0 00H
W−−SCON FLR SCR3 SCR2 SCR1 SCR0 00H
87FCH R/W HSYNC Delay −HSD6 HSD5 HSD4 HSD3 HSD3 HSD1 HSD0 00H
87FDH R/W VSYNC Delay −VSD6 VSD5 VSD4 VSD3 VSD2 VSD1 VSD0 00H
87FEH R/W Top Scroll Line −−−−SCL3 SCL2 SCL1 SCL0 00H
87FFH R/W Configuration CC VDEL2 VDEL1 VDEL0 TXT/V − 100 Hz Two_Page 00H
87E0H R/W Text Area Start B HOPB1 HOPB0 TASB5 TASB4 TASB3 TASB2 TASB1 TASB0 00H
87E1H R/W Text Area End B −−TAEB5 TAEB4 TAEB3 TAEB2 TAEB1 TAEB0 00H
87E2H R/W Page B Position PGB7 PGB6 PGB5 PGB4 PGB3 PGB2 PGB1 PGB0 00H
87E3H R/W Text Position Vertical B −−VOLB5 VOLB4 VOLB3 VOLB2 VOLB1 VOLB0 00H
87E4H R/W Vertical Range −−SMTHB SMTH RANGE1 RANGE0 RANGEB1 RANGEB0 00H
2001 Feb 13 92
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Table 41 MMR bit definition
REGISTER FUNCTION
Display Control
SRC3 to SRC0 screen colour definition
MSH meshing all background colours (logic 1)
MOD2 to MOD0 00 = Video
01 = Full Text
10 = Mixed Screen Colour
11 = Mixed Video
Text Position Vertical
VPOL inverted input polarity (logic 1)
HPOL inverted input polarity (logic 1)
VOL5 to VOL0 display start vertical offset from VSYNC (lines)
Text Area Start
HOP1 to HOP0 fine horizontal offset in quarter of characters, in single page mode or for Page A in double
window mode
TAS5 to TAS0 text area start, in single page mode or for Page A in double window mode
Fringing Control
FRC3 to FRC0 fringing colour, value address of CLUT
FRDN fringe in north direction (logic 1)
FRDE fringe in east direction (logic 1)
FRDS fringe in south direction (logic 1)
FRDW fringe in west direction (logic 1)
Text Area End
TAE5 to TAE0 text area end, in full characters, in single page mode or for Page A in double window mode
Scroll Area
SSH3 to SSH0 soft scroll height
SSP3 to SSP0 soft scroll position
Scroll Range
SPS3 to SPS0 stop scroll row
STS3 to STS0 start scroll row
RGB Brightness
VDSPOL VDS polarity
0 = RGB (1), Video (0)
1 = RGB (0), Video (1)
BRI3 to BRI0 RGB brightness control
2001 Feb 13 93
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Status read
BUSY access to Display memory could cause display problems (logic 1)
FIELD even field (logic 1)
FLR active flash region background only displayed (logic 1)
SCR3 to SCR0 first scroll row
Status write
SCON scroll area enabled (logic 1)
FLR active flash region background colour only displayed (logic 1)
SCR3 to SCR0 first scroll row
HSYNC Delay
HSD6 to HSD0 HSYNC delay, in full size characters
VSYNC Delay
VSD6 to VSD0 VSYNC delay in number of 8-bit 12 MHz clock cycles
Top Scroll Line
SCL3 to SCL0 top line for scroll
Configuration
CC Closed Caption mode (logic 1)
VDEL2 to VDEL0 pixel delay between VDS and RGB output
000 = VDS switched to video, not active
001 = VDS active one pixel earlier then RGB
010 = VDS synchronous to RGB
100 = VDS active one pixel after RGB
TXT/V BUSY signal switch; horizontal (logic 1)
100 Hz 100 Hz mode select; 100Hz/120Hz timing mode (logic 1)
Two_Page two page mode select; dual page (logic 1)
Text Area Start B
HOP1 to HOP0 fine horizontal offset in quarter of characters
TAS5 to TAS0 text area start
Text Area End B
TAE5 to TAE0 text area end, in full characters
Page B Position
PGB7 to PGB0 Page B position
Text Position Vertical B
VOLB5 to VOLB0 Page B display start vertical offset from VSYNC (lines) should equal VOL5 to VOL0 in
double window mode (MMR 87F1H<5:0>)
Vertical Range
SMTHB smoothing on, on Page B (logic 1)
REGISTER FUNCTION
2001 Feb 13 94
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
SMTH smoothing on, on Page A (logic 1)
RANGE1 to RANGE0 additional two bits for display vertical offset
RANGEB1 to RANGEB0 additional two bits for display vertical offset on Page B
REGISTER FUNCTION
25 IN-SYSTEM PROGRAMMING INTERFACE
A serial programming interface is available for late OTP
programming. The interface is based on the IEEE1149
(JTAG) standard, but only two instructions are utilized.
Table 42 shows which port pins are used for ISP.
Care should be taken during system design to ensure the
pinsusedfor serialprogrammingdonot cause conflictwith
theapplication circuit.Itisadvised todedicatethe portpins
(P2.1, P2.2, P2.3 and P2.4) to ISP, and not use them in
application.
However, if it is necessary to use them in application then
they must be assigned as output.
The device is placed in ISP mode using the RESET pin.
Pin P0.2 must be held HIGH during ISP mode. Power to
the device during ISP may be sourced either from the
application or from an external source. Ground reference
between the programmer and the target should be
common.
For further details, refer to the “In-System Programming
Application Note SPG/AN00027”.
Table 42 Port pins used for ISP
26 LIMITING VALUES
In accordance with Absolute Maximum Rating System (IEC 60134).
Note
1. For 5 V tolerant I/Os, the maximum value may be 6 V only when VDD is present.
PIN NAME FUNCTION
P2.0 EN Enables JTAG operations (specific to SAA56xx)
P2.1 TCK Test clock
P2.2 TMS Test Mode Select
P2.3 TDI Test Data In
P2.4 TDO Test Data Out
VPE VPE 9 V Programming Voltage
RESET RESET Device reset/mode selection
RESET (alternative) RESET Device reset/mode selection
XTALIN CLK Clock 12 MHz
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
VDDX supply voltage (all supplies) −0.5 +4.0 V
VIinput voltage (any input) note 1 −0.5 (VDD + 0.5) or 4.1 V
VOoutput voltage (any output) −0.5 VDD + 0.5 V
IOoutput current (each output) −10 mA
IIOK DC input or output diode current −20 mA
Tjoperating junction temperature −20 +125 °C
Tstg storage temperature −55 +125 °C
2001 Feb 13 95
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
27 THERMAL CHARACTERISTICS
28 CHARACTERISTICS
VDD = 3.3 V ±10%; VSS =0V; T
amb =−20 to +70 °C; unless otherwise specified.
SYMBOL PARAMETER CONDITIONS VALUE UNIT
Tres(j-a) package thermal resistance from junction to ambient in free air 52 0C/W
Tres(j-c) package thermal resistance from junction to case 8 0C/W
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Supplies
VDDX any supply voltage (VDD to VSS) 3.0 3.3 3.6 V
IDDP periphery supply current note 1 1 −− mA
IDDC core supply current −15 18 mA
IDDC(id) Idle mode core supply current −4.6 6 mA
IDDC(pd) Power-down mode core supply current −0.76 1 mA
IDDA analog supply current −45 48 mA
IDDA(id) Idle mode analog supply current −0.87 1 mA
IDDA(pd) Power-down mode analog supply current −0.45 0.7 mA
Digital inputs
RESET
VIL LOW-level input voltage −−1.00 V
VIH HIGH-level input voltage 1.85 −5.5 V
Vhys hysteresis voltage of Schmitt trigger input 0.44 −0.58 V
ILI input leakage current VI=0 −−0.17 µA
Rpd equivalent pull-down resistance VI=V
DD 55.73 70.71 92.45 kΩ
RESET, EA, INTD
VIL LOW-level input voltage −−0.98 V
VIH HIGH-level input voltage 1.73 −5.5 V
Vhys hysteresis voltage of Schmitt trigger input 0.41 −0.5 V
ILI input leakage current VI=V
DD −−0.00 µA
Rpu equivalent pull-up resistance VI= 0 46.07 55.94 70.01 kΩ
HSYNC, VSYNC
VIL LOW-level input voltage −−0.96 V
VIH HIGH-level input voltage 1.80 −5.5 V
Vhys hysteresis of Schmitt trigger input 0.40 −0.56 V
ILI input leakage current VI=0toV
DD −−0.00 µA
2001 Feb 13 96
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Digital outputs
FRAME, VDS, RD, WR, PSEN, ALE, A0 TO A7, A16, A17, MOVX_WR, MOVX_RD, A15_BK, ROMBK0 TO ROMBK2,
RAMBK0, RAMBK1 (PUSH-PULL OUTPUTS)
VOL LOW-level output voltage IOL =3mA −−0.13 V
VOH HIGH-level output voltage IOH = 3 mA 2.84 −− V
t
routput rise time 10% to 90% of VDD,
CL=70pF 7.50 8.85 10.90 ns
tfoutput fall time 10% to 90% of VDD,
CL=70pF 6.70 7.97 10.00 ns
COR (OPEN-DRAIN OUTPUT), A8 TO A15 (PUSH-PULL OUTPUTS)
VOL LOW-level output voltage IOL =3mA −−0.14 V
VOH HIGH-level pull-up output voltage IOL =−3 mA; push-pull 2.84 −− V
I
LI input leakage current VI= 0 to VDD −−0.12 µA
troutput rise time 10% to 90% of VDD,
CL=70pF 7.20 8.64 11.10 ns
tfoutput fall time 10% to 90% of VDD,
CL=70pF 4.90 7.34 9.40 ns
Digital input/outputs
P0.0 TO P0.4, P0.7, P1.0 TO P1.1, P2.1 TO P2.7, P3.0 TO P3.7
VIL LOW-level input voltage −−0.98 V
VIH HIGH-level input voltage 1.78 −5.50 V
Vhys hysteresis of Schmitt trigger input 0.41 −0.55 V
ILI input leakage current VI=0toV
DD −−0.01 µA
VOL LOW-level output voltage IOL =4mA −−0.18 V
VOH HIGH-level output voltage IOH =−4 mA push-pull 2.81 −− V
t
routput rise time 10% to 90% of VDD,
CL= 70 pF push-pull 6.50 8.47 10.70 ns
tfoutput fall time 10% to 90% of VDD,
CL=70pF 5.70 7.56 10.00 ns
P1.2, P1.3 AND P2.0
VIL LOW-level input voltage −−0.99 V
VIH HIGH-level input voltage 1.80 −5.50 V
Vhys hysteresis voltage of Schmitt trigger input 0.42 −0.56 V
ILI input leakage current VI=0toV
DD −−0.02 µA
VOL LOW-level output voltage IOL =4mA −−0.17 V
VOH HIGH-level output voltage IOH =−4 mA push-pull 2.81 −− V
t
routput rise time 10% to 90% of VDD;
CL= 70 pF push-pull 7.00 8.47 10.50 ns
tfoutput fall time 10% to 90% of VDD;
CL=70pF 5.40 7.36 9.30 ns
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
2001 Feb 13 97
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
P0.5 AND P0.6
VIL LOW-level input voltage −−0.98 V
VIH HIGH-level input voltage 1.82 −5.50 V
ILI input leakage current VI=0toV
DD −−0.11 µA
Vhys hysteresis voltage of Schmitt trigger input 0.42 −0.58 V
VOL LOW-level output voltage IOL =8mA −−0.20 V
VOH HIGH-level output voltage IOH =−8 mA push-pull 2.76 −− V
t
routput rise time 10% to 90% of VDD;
CL= 70 pF push-pull 7.40 8.22 8.80 ns
tfoutput fall time 10% to 90% of VDD;
CL=70pF 4.20 4.57 5.20 ns
P1.4 TO P1.7 (OPEN-DRAIN)
VIL LOW-level input voltage −−1.08 V
VIH HIGH-level input voltage 1.99 −5.50 V
Vhys hysteresis voltage of Schmitt trigger input 0.49 −0.60 V
ILI input leakage current VI=0toV
DD −−0.13 µA
VOL LOW-level output voltage IOL =8mA −−0.35 V
tfoutput fall time 10% to 90% of VDD;
CL=70pF 69.70 83.67 103.30 ns
tf(I2C) output fall time in relation to the I2C-bus
specifications 3 V to 1.5 V at
IOL = 3 mA CL= 400 nF −57.80 −ns
AD0 TO AD7 (QUASI-BIDIRECTIONAL)
VIL LOW-level input voltage −−0.98 V
VIH HIGH-level input voltage 1.82 −5.50 V
Vhys hysteresis voltage of Schmitt trigger input 0.40 −0.58 V
ILI input leakage current VI=0,V
DD/2, VDD −−0.12 µA
VOL LOW-level output voltage IOL =3mA −−0.14 V
VOH HIGH-level output voltage IOL =−3 mA; push-pull 2.84 −− V
t
routput rise time 10% to 90% of VDD;
CL=70pF 7.20 8.64 11.10 ns
tfoutput fall time 10% to 90% of VDD;
CL=70pF 4.90 7.34 9.40 ns
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
2001 Feb 13 98
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Analog inputs
CVBS0 AND CVBS1
Vsync sync voltage amplitude 0.1 0.3 0.6 V
Vvid(p-p) video input voltage amplitude
(peak-to-peak value) 0.7 1.0 1.4 V
Zsource source impedance 0 −250 Ω
VIH HIGH-level input voltage 3.0 −VDDA + 0.3 V
CIinput capacitance −−10 pF
IREF
Rgnd resistor to ground resistor tolerance 2% −24 −kΩ
ADC0 TO ADC3
VIH HIGH-level input voltage input range = VDDP -V
TN −−V
DDA V
CIinput capacitance −−10 pF
VPE
VIH HIGH-level input voltage −−9.0 V
Analog outputs
R, G AND B
IOL output current (black level) VDDA = 3.3 V −10 −+10 µA
IOH output current (maximum Intensity) VDDA = 3.3 V, intensity
level code = 31 decimal 6.0 6.67 7.3 mA
output current (70% of full intensity) VDDA = 3.3 V, intensity
level code = 0 decimal 4.2 4.7 5.1 mA
Rload load resistor to VSSA resistor tolerance 5% −150 −Ω
C
Lload capacitance −−15 pF
troutput rise time 10% to 90% full intensity −16.1 −ns
tfoutput fall time 10% to 90% full intensity −14.5 −ns
Analog input/output
SYNC_FILTER
Csync storage capacitor to ground −100 −nF
Vsync sync filter level voltage for nominal sync
amplitude 0.35 0.55 0.75 V
Crystal oscillator
XTALIN
VIL LOW-level input voltage VSSA −− V
V
IH HIGH-level input voltage −−V
DDA V
CIinput capacitance −−10 pF
XTALOUT
COoutput capacitance −−10 pF
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
2001 Feb 13 99
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
Notes
1. Peripheral current is dependent on external components and voltage levels on I/Os.
2. Crystal order number 4322 143 05561.
3. If the 4322 143 05561 crystal is not used, then the formulae in the crystal specification should be used. Where
CIO = 7 pF, the mean of the capacitances due to the chip at XTALIN and at XTALOUT. Cext is a value for the mean
of the stray capacitances due to the external circuit at XTALIN and XTALOUT. The maximum value for the crystal
holder capacitance is to ensure startup, Cosc may need to be reduced from the initially selected value.
4. Cosc(typ) =2C
L−C
IO −Cext
5. C0(max) =35−1
⁄
2
(Cosc +C
IO +C
ext)
Crystal specification; notes 2 and 3
fxtal nominal frequency fundamental mode −12 −MHz
CLcrystal load capacitance −-30 pF
C
1crystal motional capacitance Tamb =25°C−−20 fF
Rrresonance resistance Tamb =25°C−−60 Ω
Cosc capacitors at XTALIN, XTALOUT Tamb =25°C−note 4 −pF
C0crystal holder capacitance Tamb =25°C−−note 5 pF
Txtal temperature range −20 +25 +85 °C
Xjadjustment tolerance Tamb =25°C−−±50 ×10−6
Xddrift −−±100 ×10−6
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
2001 Feb 13 100
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
29 QUALITY AND RELIABILITY
This device will meet Philips Semiconductors General Quality Specification for Integrated Circuits
“SNW-FQ-611D”
. The
principal requirements are shown in Tables 43 to 45.
29.1 Lot acceptance
Table 43 Acceptance tests per lot
Note
1. ppm = fraction of defective devices, in parts per million.
29.2 Reliability Performance
Table 44 Reliability tests (by process family)
Note
1. FPM = fraction of devices failing at test condition, in Failures Per Million.
Table 45 Reliability tests (by device type)
TEST REQUIREMENTS(1)
Mechanical cumulative target: <80 ppm
Electrical cumulative target: <100 ppm
TEST CONDITIONS REQUIREMENTS(1)
High temperature operating life 168 hours at Tj= 150 °C <500 FPM
Humidity life temperature, humidity, bias 1000 hours,
85 °C, 85% RH (or equivalent test) <1000 FPM
Temperature cycling performance −65 to 150 °C <2000 FPM
TEST CONDITIONS REQUIREMENTS
ESD and latch-up ESD Human body model 100 pF, 1.5 kΩ2000 V
ESD Machine model 200 pF, 0 Ω200 V
latch-up 100 mA, 1.5 ×VDD(max)
2001 Feb 13 101
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
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30 APPLICATION INFORMATION
30.1 Application diagram
k
, full pagewidth
GSA080
93
VDD
VDD
VAFC
AV status
program+
program−
plus(+)
minus(−)
menu
Vtune
VSS
VSS
VSS
VDD
VDD
VDD
VDD
VSSC
VDDP
VDDC
VSSP
VSSA
VSS
VPE
VSS
VSS
VSS
P2.1/PWM0
94
P2.2/PWM1
95
P2.3/PWM2
96
P2.4/PWM3
97
P2.5/PWM4
98
P2.6/PWM5
1
P2.7/PWM6
2
P3.0/ADC0
P3.1/ADC1
P3.2/ADC2
P0.0/RX
VHF-L
VHF-H
UHF
TV
control
signals
P3.3/ADC3
4
5
6
11
16
17
18
22
24
13
28
29
P0.1/TX
P0.2/INT2
P0.3/INT3
P0.4/INT4
P0.5
P0.6
P0.7/T2
G
B
VDDA
HSYNC
VDS
R
VSYNC
XTALOUT
XTALIN
OSCGND
P1.0/INT1
RESET
P3.4/PWM7/T2EX
IREF
100 nF
100 nF
100 nF
FRAME
SYNC_FILTER
CVBS1
CVBS0
CVBS (IF)
CVBS (SCART)
30
31
32
35
34
43
41
21, 42
100
83
82
81
80
79
78
76
75
73
71
70
69
63
12, 60
55
53
52
48
47
46
45
44
84
P2.0/TPWM
A2
P1.4/SCL1
P1.7/SDA0
P1.6/SCL0
P1.3/T1
P1.2/INT0
P1.1/T0
P1.5/SDA1
SDA
A1
SCL
A0
RC
brightness
contrast
saturation
hue
volume (L)
volume (R)
VDD
VSS 1 kΩ
1 kΩ
150 Ω
24 kΩ
VDD
40 V
VSS VSS
VDD
VSS
PH2369 47 µF
VDD
VSS
VDD
100 nF
COR
VSS
VDD
47 µF
10 µF
100 nF
56 pF
VDD
VDD
VDD
VSS
VSS
EEPROM
PCF8582E
SAA56xx
(SOT407-1)
IR
RECEIVER
12 MHz
to TV's
display
circuits
TV
control
signals
field flyback
line flyback
EA
14
VDD
RESET
72 VDD
Fig.41 Application diagram.
Bidirectional ports have been configured as open-drain, output ports have been configured as push-pull.
2001 Feb 13 102
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
30.2 External SRAM implementation
30.2.1 APPLICATION DIAGRAM
GSA081
handbook, full pagewidth
SRAM
SAA56xx
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A0
RAMBK1
A1
A2
A3
A12
A13
A5
A4
A15_BK
D7
1
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
2 3 4 5 6 7 8 9 10 11 12 13 14 1516 17 18 19 20 21 22 23 24 25
75 74 73 72 71 70 6968 67 66
A11
RAMBK0
A10
A9
A8
65 64 63 62 61 60 59 58 57 56 55 54 53 5251
26
D6
D5
D4
D3
D2
D1
D0
A7
A7
A6
A6
A5
A4
A3
A2
A1
A0
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
WR
RD/WR RD
A14
OE
Fig.42 Application diagram for multipage.
2001 Feb 13 103
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
30.2.2 APPLICATION NOTES
Ports AD0 to AD7 of the microcontroller can be connected
to pins D0 to D7 of the SRAM in any order.
For the addressing, the lower group of address lines
(A0 to A8) and the upper group of address lines
(A9 to A14, A15_BK, RAMBK0 and RAMBK1) may be
connectedinany orderwithinthegroups, providedthatthe
full 256 kbytes of external SRAM is used.
Fig.42 shows the application diagram for multipage.
When using an external SRAM smaller than 256 kbytes,
the relevant number of bits from the microcontroller
addressbus shouldbedisconnected,alwaysremoving the
most significant bits first.
For power saving modes, it might be advisable to control
the CE pin of the SRAM module(s) using one of the
microcontroller ports to de-select the SRAM.
30.2.3 EXTERNAL DATA MEMORY ACCESS
Table 46 External data memory access
See Figs. 43 and 44.
Note
1. The external SRAM is intended to be used with the
multipage software, therefore only the 12 MHz clock
microcontroller timings are provided.
30.2.3.1 Symbol explanations
Eachtiming symbolhasfivecharacters. Thefirstcharacter
is always ‘t’ (time). Depending on their positions, the other
characters indicate the name of a signal or the logical
status of that signal. The designations are:
A = Address
C = Clock
D = Input data
H = Logic level HIGH
I = Instruction (program memory contents)
L = Logic level LOW, or ALE
P = PSEN
Q = Output data
R = RD signal
t = Time
V = Valid
W = WR signal
X = No longer a valid logic level
Z = Float
Examples:
tAVLL = Time for address valid to ALE LOW.
tLLPL = Time for ALE to PSEN LOW.
SYMBOL PARAMETER TYPICAL(1) UNIT
tRLRH RD pulse width 250 ns
tWLWH WR pulse width 250 ns
tRLDV RD LOW to valid data in 198 ns
tRHDX Data hold after RD 0 ns
tRHDZ Data float after RD tbd ns
tLLWL ALE LOW to RD or
WR LOW 132 ns
tAVWL Address valid to WR
LOW or RD LOW 172 ns
tQVWX Data valid to WR LOW 89 ns
tWHQX Data hold after WR 15 ns
tRLAZ RD LOW to address
float tbd ns
tWHLH RD or WR HIGH to
ALE HIGH 40 ns
2001 Feb 13 104
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
handbook, full pagewidth
GSA082
tLLWL tRLRH
ALE
PSEN
RD
AD<0:7>
A<0:14>, A15_BK,
RAMBK<0:1>
A0-A7 DATA IN A0-A7 INSTR IN
tAVWL
tAVLL tRHDX
tLLAX tRLAZ
tRLDV tRHDZ
tWHLH
Fig.43 External data memory read cycle.
handbook, full pagewidth
GSA083
tLLWL tWLWH
ALE
PSEN
WR
AD<0:7>
A<0:14>, A15_BK,
RAMBK<0:1>
A0-A7 DATA OUT A0-A7 FROM PCL INSTR IN
tAVWL
tAVLL
tLLAX tQVWX tWHQX
tWHLH
Fig.44 External data memory write cycle.
2001 Feb 13 105
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
31 EMC GUIDELINES
Optimization of circuit return paths and minimization of
commonmodeemissionwillbe assisted by using a double
sided printed-circuit board with low inductance ground
plane.
On a single sided printed-circuit board, a local ground
plane under the whole IC should be present, as shown in
Fig.45. This should be connected by the widest possible
connection back to the PCB ground connection, and bulk
electrolytic decoupling capacitor. It should preferably not
connect to other grounds on the way and no wire links
should be present in this connection. The use of wire links
increases ground bounce by introducing inductance into
the ground.
The supply pins can be decoupled at the pin to the ground
plane under the IC. This is easily accomplished using
surface mount capacitors, which are more effective than
leaded components at high frequency.
Using a device socket will unfortunately add to the area
and inductance of the external bypass loop.
A ferrite bead or inductor with resistive characteristics at
high frequencies may be utilised in the supply line close to
the decoupling capacitor to provide a high impedance.
To prevent pollution by conduction onto the signal lines
(which may then radiate), signals connected to the VDD
supplyviaa pull-up resistorshouldnotbe connected to the
IC side of this ferrite component.
Pin OSCGNDshouldbeconnected only to the crystal load
capacitors and not the local or circuit GND.
Physical connection distances to associated active
devices should be short.
Output traces should be routed with close proximity
mutually coupled ground return paths.
handbook, full pagewidth
electrolytic decoupling capacitor (2 µF)
ferrite beads
SM decoupling capacitors (10 to 100 nF)
under-IC GND plane
IC
MBK979
VSSC VSSA
VDDP
VSSP
VDDC
VDDA
GND +3.3 V
other
GND
connections
under-IC GND plane
GND connection
note: no wire links
Fig.45 Power supply connections for EMC.
2001 Feb 13 106
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
32 PACKAGE OUTLINE
UNIT A
max. A1A2A3bpcE
(1) eH
E
LL
pZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm 1.6 0.15
0.05 1.45
1.35 0.25 0.27
0.17 0.20
0.09 14.1
13.9 0.5 16.25
15.75 1.15
0.85 7
0
o
o
0.08 0.080.21.0
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
0.75
0.45
SOT407-1 136E20 MS-026 00-01-19
00-02-01
D(1) (1)(1)
14.1
13.9
HD
16.25
15.75
E
Z
1.15
0.85
D
bp
e
θ
EA1
A
Lp
detail X
L
(A )
3
B
25
c
D
H
bp
E
HA2
vMB
D
ZD
A
ZE
e
vMA
X
1
100
7675 5150
26
y
pin 1 index
wM
wM
0 5 10 mm
scale
LQFP100: plastic low profile quad flat package; 100 leads; body 14 x 14 x 1.4 mm SOT407-1
2001 Feb 13 107
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
33 SOLDERING
33.1 Introduction to soldering surface mount
packages
Thistext givesavery briefinsighttoa complextechnology.
A more in-depth account of soldering ICs can be found in
our
“Data Handbook IC26; Integrated Circuit Packages”
(document order number 9398 652 90011).
There is no soldering method that is ideal for all surface
mount IC packages. Wave soldering is not always suitable
for surface mount ICs, or for printed-circuit boards with
high population densities. In these situations reflow
soldering is often used.
33.2 Reflow soldering
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
totheprinted-circuit board by screen printing,stencillingor
pressure-syringe dispensing before package placement.
Several methods exist for reflowing; for example,
infrared/convection heating in a conveyor type oven.
Throughput times (preheating, soldering and cooling) vary
between 100 and 200 seconds depending on heating
method.
Typical reflow peak temperatures range from
215 to 250 °C. The top-surface temperature of the
packages should preferable be kept below 230 °C.
33.3 Wave soldering
Conventional single wave soldering is not recommended
forsurface mountdevices(SMDs) orprinted-circuitboards
with a high component density, as solder bridging and
non-wetting can present major problems.
To overcome these problems the double-wave soldering
method was specifically developed.
If wave soldering is used the following conditions must be
observed for optimal results:
•Use a double-wave soldering method comprising a
turbulent wave with high upward pressure followed by a
smooth laminar wave.
•For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint
longitudinal axis is preferred to be parallel to the
transport direction of the printed-circuit board;
– smaller than 1.27 mm, the footprint longitudinal axis
must be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
•Forpackages withleadsonfoursides, thefootprintmust
be placed at a 45°angle to the transport direction of the
printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
33.4 Manual soldering
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V or
less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to
300 °C.
When using a dedicated tool, all other leads can be
soldered in one operation within 2 to 5 seconds between
270 and 320 °C.
2001 Feb 13 108
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
33.5 Suitability of surface mount IC packages for wave and reflow soldering methods
Notes
1. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum
temperature (with respect to time) and body size of the package, there is a risk that internal or external package
cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the
Drypack information in the
“Data Handbook IC26; Integrated Circuit Packages; Section: Packing Methods”
.
2. These packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink
(at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version).
3. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction.
The package footprint must incorporate solder thieves downstream and at the side corners.
4. Wave soldering is only suitable for LQFP, TQFP and QFP packages with a pitch (e) equal to or larger than 0.8 mm;
it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
5. Wave soldering is only suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than 0.65 mm; it is
definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
PACKAGE SOLDERING METHOD
WAVE REFLOW(1)
BGA, LFBGA, SQFP, TFBGA not suitable suitable
HBCC, HLQFP, HSQFP, HSOP, HTQFP, HTSSOP, SMS not suitable(2) suitable
PLCC(3), SO, SOJ suitable suitable
LQFP, QFP, TQFP not recommended(3)(4) suitable
SSOP, TSSOP, VSO not recommended(5) suitable
2001 Feb 13 109
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
34 DATA SHEET STATUS
Note
1. Please consult the most recently issued data sheet before initiating or completing a design.
DATA SHEET STATUS PRODUCT
STATUS DEFINITIONS (1)
Objective specification Development This data sheet contains the design target or goal specifications for
product development. Specification may change in any manner without
notice.
Preliminary specification Qualification This data sheet contains preliminary data, and supplementary data will be
published at a later date. Philips Semiconductors reserves the right to
make changes at any time without notice in order to improve design and
supply the best possible product.
Product specification Production This data sheet contains final specifications. Philips Semiconductors
reserves the right to make changes at any time without notice in order to
improve design and supply the best possible product.
35 DEFINITIONS
Short-form specification The data in a short-form
specification is extracted from a full data sheet with the
same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition Limiting values given are in
accordance with the Absolute Maximum Rating System
(IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device.
These are stress ratings only and operation of the device
atthese or atanyother conditions abovethosegiven inthe
Characteristics sections of the specification is not implied.
Exposure to limiting values for extended periods may
affect device reliability.
Application information Applications that are
described herein for any of these products are for
illustrative purposes only. Philips Semiconductors make
norepresentationorwarrantythatsuch applicationswill be
suitable for the specified use without further testing or
modification.
36 DISCLAIMERS
Life support applications These products are not
designed for use in life support appliances, devices, or
systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips
Semiconductorscustomersusingorsellingtheseproducts
for use in such applications do so at their own risk and
agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes Philips Semiconductors
reserves the right to make changes, without notice, in the
products, including circuits, standard cells, and/or
software, described or contained herein in order to
improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for
theuse ofanyoftheseproducts, conveysnolicence ortitle
under any patent, copyright, or mask work right to these
products,andmakes no representationsorwarrantiesthat
these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified.
37 PURCHASE OF PHILIPS I2C COMPONENTS
Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
2001 Feb 13 110
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
NOTES
2001 Feb 13 111
Philips Semiconductors Product specification
Enhanced TV microcontrollers with
On-Screen Display (OSD) SAA56xx
NOTES
© Philips Electronics N.V. SCA
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Internet: http://www.semiconductors.philips.com
2001 71
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Printed in The Netherlands 753504/02/pp112 Date of release: 2001 Feb 13 Document order number: 9397 750 07843
