K0S Family Product BriefMarch 1998
Description The µP D7891xx microcontrollers are new members of NEC’s low-cost K0S 8-bit
microcontroller family. They offer a system clock choice of an RC circuit or resonator,
and are available with an 8- or 10-bit A/D converter. The µPD7891xx family is
fabricated using an 0.35-micron CMOS process for low power consumption and
minimal cost. With 28- or 30-pin package options, these devices are ideal for cost-
sensitive consumer applications needing analog interfaces.
These microcontroll ers are supported by an extensive tool chain, compatible across
NEC’s entire K Series® line of 8- and 16-bit microcontrollers. The tools contain a
software simulator, C compiler, relocatable assembler, screen debugger, and in-circuit
emulator.
Figu re 1. Bl ock Di agram
98YL-0003B (1/98)
16-bit Timer
TM20 CPU &
Macro
Control
Hardware
Multiply
System Registers
– PC
– PSW
– Stack Pointer
ALU
Main Clock
Oscillator
Sytem
Control
4 Channel 8-bit
A/D Converter
CPT20
T020
Clocks and
System Control
ROM
2K, 4K & 8K
RAM
256 bytes
Eight 8-bit
GP Registers
Memory CPU Core
ANI0-ANI3
INTP0-INTP2
P00-P25
AVDD
AVSS
RESET
CL2
VDD
VSS
IC
CL1
8-bit T/E
Counter 80
TI80
TO80
Watchdog
20 Port Pins Programmable
Interrupt
P50-P63
• • •
• • •
Timer/Event Counter
Timers
Timers and Counters
16-bit Timer
UART
RxD20/SI20
TxD20/SO20
SCK20 BRG
Serial Channels
UART (SIO20)
µPD/8910x/911x/912x/913x
8-Bit General-Purpose Microcontrollers
With 8- or 10-Bit A/D and RC or Ceramic Oscillator
Specifications
Clock frequenc y
• RC oscillator up to 4 MHz
• Ce ra mic o s c illator up to 5 MH z
Minimum instruct ion execution time
• RC oscillator –0. 5 µs
• Ce ra mic os c illator –0 . 4 µ s
Operating voltage: 1.8 to 5.5 volts
Operating temperature: –40 to +85°C
0.35-micron CMOS proces s technology
Power consumption
• 3 .0 mW ( n ormal m ode)
• 2.7 mW (halt mode)
• 0.00015 mW (stop mode)
Packages
• 28-pin SDIP (400 mil)
• 30-pin SSOP (300 mil)
Features
Architecture
•8-bit CPU
• B it, byte, or wor d in s t ru c t ion s et w it h 8 x 8 mult iply in s t r uc t io n
• Minimum instruc tion execut ion tim e
– 400 ns using XTA L
– 500 ns using RC oscillation
• Eight 8-bit registers
Memory
• 64K linear address space
• 2K to 16K internal ROM
• 16K flash version
• Fully static 256-byt e internal RAM
Clock sources
• Resonator: 1 to 5 MHz (µPD78910x/911x)
• RC circuit: 0.4 to 4 MHz (µPD78912x/913x)
Interrupts
• Three extern al maskable interrupts
• Six internal maskable interrupts
• Automatic release of halt and stop modes
Peripherals
• Twenty general- purpose I/O pins
• One 16-bit timer/counter
• One 8-bit timer/ eve nt counter with PWM mode
•
One watchdog/interval timer
• One serial channel
– UA RT with baud rate generator
– Three-wire synchronous mode
• F our-channel 8- or 10-bit A/D converter
Note: Target speci ficat ion
Table 1. Power-Saving Features
Voltage Mode and Typical Power at 5 MHz Note
Normal Mode: Chip 100% On
(Main System Clock On) Halt Mode: CPU Clock Off
and Main Clock On Stop Mode: Main Clock
Off
5 v olts 10.5 mW 8 mW 0.0005 mW
3 volts 3 mW 2.7 mW 0.0001 mW
Table 2. Ordering Informati on
Pa rt Number Internal ROM A/D Main Clock Source RAM
µPD7891 01CT/GS 2K mask ROM 8-bit Ceramic resonator 256
µPD 789102CT/GS 4K mask ROM 8-bit
µPD789104CT/GS 8K flash memo ry 8-bit
µPD7891 11CT/GS 2K mas k ROM 10-bit
µPD7891 12CT/GS 4K mas k ROM 10-bit
µPD789114CT/GS 8K flash memo ry 10-bit
µPD78F9 116CT/GS 16K fl ash memory 10-bit
µPD789121CT/GS 2K mask R O M 8-bit R C clock
µPD7891 22CT/GS 4K mas k ROM 8-bit
µPD789124CT/GS 8K flash memo ry 8-bit
µPD7891 31CT/GS 2K mas k ROM 10-bit
µPD7891 32CT/GS 4K mas k ROM 10-bit
µPD789134CT/GS 8K flash memo ry 10-bit
µPD78F9 136CT/GS 16K fl ash memory 10-bit
In North America: No part o f thi s document m ay be c opi ed or reproduced in a ny form or by any means wit hout
the prior written consent of NEC Electronics Inc. (NECEL). The information in this document is subject t o change
without notice. All devices sold by NECEL are covered by the provisions appearing in NECEL Terms and
Cond itions of Sales only. Including t he limitatio n of liab ility, warranty, and pat ent prov isions. NECEL makes no
warranty, express, statutor y, implied or by description, regarding information set forth herein or regarding the
freedom of the described de v ices f rom patent infringement. N ECEL assumes no resp onsibilit y fo r any err ors that
may appear in this document. NECEL makes no commitments to update or to keep current information
contained in t hi s document. T he devices listed in thi s document are n ot suitabl e for use in applicat i ons such as,
but not limited to, aircraft control systems, aerospace equipment, submarine cables, nuclear reactor control
systems, and life support systems. “Standard” quality grade devices are recommended for computers, office
equipment, communication equipment, test and measurement equipment, machine tools, industrial robots,
audi o and vi sual eq ui pm ent, and othe r consumer products. For a utomoti ve and transportation equi pm ent, traffic
control systems, anti-disaster and anti-crime systems, it is recommended that the customer contact the
responsible NECEL salesperson to determine the reliability requirements fo r any such application and any cost
adde r. NE CE L does no t rec ommen d or a ppr ove use of any of its pro duct s in life su ppo rt devices or sys tems or
For literature, ca ll 1-800-366-9782 7 a.m. to 6 p.m. Pacific time
or FAX your reques t to 1-800-729-9288
or visit our web site at www.nec.com
NEC Electronics Inc.
CORPORATE HEADQUARTERS
2880 Sc ott Bouleva rd
Santa Clar a, CA 9 5050-255 4
TEL 408-588 -6000
K Se ries is eit her a tradema rk o r registered trade m ark of NEC El ectronic s Inc. in the United States and/or other
countr i es . I 2C is a trademark of NV Philips.
