1
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
8-bit
Microcontroller
with Low Power
2.4GHz
Transceiver for
ZigBee and
IEEE 802.15.4
ATmega2564RFR2
ATmega1284RFR2
ATmega644RFR2
42073BS-MCU Wireless-09/14
Features
• Network support by hardware assisted Multiple PAN Address Filtering
• Advanced Hardware assisted Reduced Power Consumption
• High Performance, Low Power AVR® 8-Bit Microcontroller
• Advanced RISC Architecture
- 135 Powerful Instructions – Most Single Clock Cycle Execution
- 32x8 General Purpose Working Registers / On-Chip 2-cycle Multiplier
- Up to 16 MIPS Throughput at 16 MHz and 1.8V – Fully Static Operation
• Non-volatile Program and Data Memories
- 256K/128K/64K Bytes of In-System Self-Programmable Flash
• Endurance: 10’000 Write/Erase Cycles @ 125°C (25’000 Cycles @ 85°C)
- 8K/4K/2K Bytes EEPROM
• Endurance: 20’000 Write/Erase Cycles @ 125°C (100’000 Cycles @ 25°C)
- 32K/16K/8K Bytes Internal SRAM
• JTAG (IEEE std. 1149.1 compliant) Interface
- Boundary-scan Capabilities According to the JTAG Standard
- Extensive On-chip Debug Support
- Programming of Flash EEPROM, Fuses and Lock Bits through the JTAG interface
• Peripheral Features
- Multiple Timer/Counter & PWM channels
- Real Time Counter with Separate Oscillator
- 10-bit, 330 ks/s A/D Converter; Analog Comparator; On-chip Temperature Sensor
- Master/Slave SPI Serial Interface
- Two Programmable Serial USART
- Byte Oriented 2-wire Serial Interface
• Advanced Interrupt Handler and Power Save Modes
• Watchdog Timer with Separate On-Chip Oscillator
• Power-on Reset and Low Current Brown-Out Detector
• Fully integrated Low Power Transceiver for 2.4 GHz ISM Band
- High Power Amplifier support by TX spectrum side lobe suppression
- Supported Data Rates: 250 kb/s and 500 kb/s, 1 Mb/s, 2 Mb/s
- -100 dBm RX Sensitivity; TX Output Power up to 3.5 dBm
- Hardware Assisted MAC (Auto-Acknowledge, Auto-Retry)
- 32 Bit IEEE 802.15.4 Symbol Counter
- SFD-Detection, Spreading; De-Spreading; Framing ; CRC-16 Computation
- Antenna Diversity and TX/RX control / TX/RX 128 Byte Frame Buffer
• PLL synthesizer with 5 MHz and 500 kHz channel spacing for 2.4 GHz ISM Band
• Hardware Security (AES, True Random Generator)
• Integrated Crystal Oscillators (32.768 kHz & 16 MHz, external crystal needed)
• I/O and Package
- 33 Programmable I/O Lines
- 48-pad QFN (RoHS/Fully Green)
• Temperature Range: -40°C to 125°C Industrial
• Ultra Low Power consumption (1.8 to 3.6V) for AVR & Rx/Tx: 10.1mA/18.6 mA
- CPU Active Mode (16MHz): 4.1 mA
- 2.4GHz Transceiver: RX_ON 6.0 mA / TX 14.5 mA (maximum TX output power)
- Deep Sleep Mode: <700nA @ 25°C
• Speed Grade: 0 – 16 MHz @ 1.8 – 3.6V range with integrated voltage regulators
Applications
• ZigBee® / IEEE 802.15.4-2011/2006/2003™ – Full and Reduced Function Device
• General Purpose 2.4GHz ISM Band Transceiver with Microcontroller
• RF4CE, SP100, WirelessHART™, ISM Applications and IPv6 / 6LoWPAN
2
42073BS-MCU Wireless-09/14
1 Pin Configurations
Figure 1-1. Pinout ATmega2564/1284/644RFR2
PF2:ADC2:DIG2
PF1:ADC1
PF0:ADC0
AVDD
EVDD
AVSS:ASVSS
XTAL1
XTAL2
PE7:ICP3:INT7:CLKO
PE5:OC3C:INT5
PE4:OC3B:INT4
PE3:OC3A:AIN1
48
47
46
45
44
43
42
41
40
39
38
37
PF3/4:ADC3/4:TCK:DIG4
1 36
PE2:XCK0:AIN0
PF5:ADC5:TMS
2 35
PE1:TXD0
PF6:ADC6:TDO
3 34
PE0:RXD0:PCINT8
PF7:ADC7:TDI
4 ATmega2564/1284/644RFR2 33
PB7:OC0A:OC1C:PCINT7
AVSS_RFP
5 32
PB6:OC1B:PCINT6
RFP
6 QFN 48 31
PB5:OC1A:PCINT5
RFN
7 30
PB4:OC2A:PCINT4
AVSS_RFN
8 7x7 mm 29
PB3:MISO:PDO:PCINT3
TST
9 28
PB2:MOSI:PDI:PCINT2
RSTN
10
27
PB1:SCK:PCINT1
PG1:DIG1
11
26
PB0:SSN:PCINT0
PG3:TOSC2
12
25
CLKI
13
14
15
16
17
18
19
20
21
22
23
24
PG4:TOSC1
DVSS:DSVSS
DVDD
DEVDD
PD0:SCL:INT0
PD1:SDA:INT1
PD2:RXD1:INT2
PD3:TXD1:INT3
PD4:ICP1
PD5:XCK1
PD6:T1
PD7:T0
Note:
The large center pad underneath the QFN/MLF package is made of metal and internally connected
to AVSS. It should be soldered or glued to the board to ensure good mechanical stability. If the
center pad is left unconnected, the package might loosen from the
board. It is not recommended to
use the exposed paddle as a replacement of the regular AVSS pins.
2 Disclaimer
Typical values contained in this datasheet are based on simulation and characterization
results of other AVR microcontrollers and radio transceivers manufactured in a similar
process technology. Minimum and Maximum values will be available after the device is
characterized.
3
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
3 Overview
The ATmega2564/1284/644RFR2 is a low-power CMOS 8-bit microcontroller based on
the AVR enhanced RISC architecture combined with a high data rate transceiver for the
2.4 GHz ISM band.
By executing powerful instructions in a single clock cycle, the device achieves
throughputs approaching 1 MIPS per MHz allowing the system designer to optimize
power consumption versus processing speed.
The radio transceiver provides high data rates from 250 kb/s up to 2 Mb/s, frame
handling, outstanding receiver sensitivity and high transmit output power enabling a
very robust wireless communication.
3.1 Block Diagram
Figure 3-1 Block Diagram
The AVR core combines a rich instruction set with 32 general purpose working
registers. All 32 registers are directly connected to the Arithmetic Logic Unit (ALU). Two
independent registers can be accessed with one single instruction executed in one
clock cycle. The resulting architecture is very code efficient while achieving throughputs
up to ten times faster than conventional CISC microcontrollers. The system includes
internal voltage regulation and an advanced power management. Distinguished by the
small leakage current it allows an extended operation time from battery.
The radio transceiver is a fully integrated ZigBee solution using a minimum number of
external components. It combines excellent RF performance with low cost, small size
and low current consumption. The radio transceiver includes a crystal stabilized
fractional-N synthesizer, transmitter and receiver, and full Direct Sequence Spread
4
42073BS-MCU Wireless-09/14
Spectrum Signal (DSSS) processing with spreading and despreading. The device is
fully compatible with IEEE802.15.4-2011/2006/2003 and ZigBee standards.
The ATmega2564/1284/644RFR2 provides the following features: 256K/128K/64K
Bytes of In-System Programmable (ISP) Flash with read-while-write capabilities,
8K/4K/2K Bytes EEPROM, 32K/16K/8K Bytes SRAM, up to 35 general purpose I/O
lines, 32 general purpose working registers, Real Time Counter (RTC), 6 flexible
Timer/Counters with compare modes and PWM, a 32 bit Timer/Counter, 2 USART, a
byte oriented 2-wire Serial Interface, a 8 channel, 10 bit analog to digital converter
(ADC) with an optional differential input stage with programmable gain, programmable
Watchdog Timer with Internal Oscillator, a SPI serial port, IEEE std. 1149.1 compliant
JTAG test interface, also used for accessing the On-chip Debug system and
programming and 6 software selectable power saving modes.
The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and
interrupt system to continue functioning. The Power-down mode saves the register
contents but freezes the Oscillator, disabling all other chip functions until the next
interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to
run, allowing the user to maintain a timer base while the rest of the device is sleeping.
The ADC Noise Reduction mode stops the CPU and all I/O modules except
asynchronous timer and ADC, to minimize switching noise during ADC conversions. In
Standby mode, the RC oscillator is running while the rest of the device is sleeping. This
allows very fast start-up combined with low power consumption. In Extended Standby
mode, both the main RC oscillator and the asynchronous timer continue to run.
Typical supply current of the microcontroller with CPU clock set to 16MHz and the radio
transceiver for the most important states is shown in the Figure 3-2 below.
Figure 3-2 Radio transceiver and microcontroller (16MHz) supply current
16,6mA
4,7mA
4,1mA
250nA
18,6mA
0
5
10
15
20
Deep Sleep SLEEP TRX_OFF RX_ON BUSY_TX
Radio transceiver and microcontroller (16MHz) supply current
I(DEVDD,EVDD) [mA]
1.8V
3.0V
3.6V
The transmit output power is set to maximum. If the radio transceiver is in SLEEP mode
the current is dissipated by the AVR microcontroller only.
In Deep Sleep mode all major digital blocks with no data retention requirements are
disconnected from main supply providing a very small leakage current. Watchdog timer,
MAC symbol counter and 32.768kHz oscillator can be configured to continue to run.
700
nA
RPC enabled □ 10.1mA
RPC disabled
5
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
The device is manufactured using Atmel’s high-density nonvolatile memory technology.
The On-chip ISP Flash allows the program memory to be reprogrammed in-system
trough an SPI serial interface, by a conventional nonvolatile memory programmer, or by
on on-chip boot program running on the AVR core. The boot program can use any
interface to download the application program in the application Flash memory.
Software in the boot Flash section will continue to run while the application Flash
section is updated, providing true Read-While-Write operation. By combining an 8 bit
RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the Atmel
ATmega2564/1284/644RFR2 is a powerful microcontroller that provides a highly
flexible and cost effective solution to many embedded control applications.
The ATmega2564/1284/644RFR2 AVR is supported with a full suite of program and
system development tools including: C compiler, macro assemblers, program
debugger/simulators, in-circuit emulators, and evaluation kits.
3.2 Pin Descriptions
3.2.1 EVDD
External analog supply voltage.
3.2.2 DEVDD
External digital supply voltage.
3.2.3 AVDD
Regulated analog supply voltage (internally generated).
3.2.4 DVDD
Regulated digital supply voltage (internally generated).
3.2.5 DVSS
Digital ground.
3.2.6 AVSS
Analog ground.
3.2.7 Port B (PB7...PB0)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each
bit). The Port B output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port B pins that are externally pulled low will source
current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset
condition becomes active, even if the clock is not running.
Port B also provides functions of various special features of the
ATmega2564/1284/644RFR2.
3.2.8 Port D (PD7...PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each
bit). The Port D output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port D pins that are externally pulled low will source
current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset
condition becomes active, even if the clock is not running.
Port D also provides functions of various special features of the
ATmega2564/1284/644RFR2.
3.2.9 Port E (PE7,PE5...PE0)
Internally Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected
for each bit). The Port E output buffers have symmetrical drive characteristics with both
high sink and source capability. As inputs, Port E pins that are externally pulled low will
6
42073BS-MCU Wireless-09/14
source current if the pull-up resistors are activated. The Port E pins are tri-stated when
a reset condition becomes active, even if the clock is not running.
Due to the low pin count of the QFN48 package port E6 is not connected to a pin.
Port E also provides functions of various special features of the
ATmega2564/1284/644RFR2.
3.2.10 Port F (PF7..PF5,PF4/3,PF2...PF0)
Internally Port F is an 8-bit bi-directional I/O port with internal pull-up resistors (selected
for each bit). The Port F output buffers have symmetrical drive characteristics with both
high sink and source capability. As inputs, Port F pins that are externally pulled low will
source current if the pull-up resistors are activated. The Port F pins are tri-stated when
a reset condition becomes active, even if the clock is not running.
Due to the low pin count of the QFN48 package port F3 and F4 are connected to the
same pin. The I/O configuration should be done carefully in order to avoid excessive
power dissipation.
Port F also provides functions of various special features of the
ATmega2564/1284/644RFR2.
3.2.11 Port G (PG4,PG3,PG1)
Internally Port G is a 6-bit bi-directional I/O port with internal pull-up resistors (selected
for each bit). The Port G output buffers have symmetrical drive characteristics with both
high sink and source capability. However the driver strength of PG3 and PG4 is
reduced compared to the other port pins. The output voltage drop (VOH, VOL) is higher
while the leakage current is smaller. As inputs, Port G pins that are externally pulled low
will source current if the pull-up resistors are activated. The Port G pins are tri-stated
when a reset condition becomes active, even if the clock is not running.
Due to the low pin count of the QFN48 package port G0, G2 and G5 are not connected
to a pin.
Port G also provides functions of various special features of the
ATmega2564/1284/644RFR2.
3.2.12 AVSS_RFP
AVSS_RFP is a dedicated ground pin for the bi-directional, differential RF I/O port.
3.2.13 AVSS_RFN
AVSS_RFN is a dedicated ground pin for the bi-directional, differential RF I/O port.
3.2.14 RFP
RFP is the positive terminal for the bi-directional, differential RF I/O port.
3.2.15 RFN
RFN is the negative terminal for the bi-directional, differential RF I/O port.
3.2.16 RSTN
Reset input. A low level on this pin for longer than the minimum pulse length will
generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to
generate a reset.
3.2.17 XTAL1
Input to the inverting 16MHz crystal oscillator amplifier. In general a crystal between
XTAL1 and XTAL2 provides the 16MHz reference clock of the radio transceiver.
3.2.18 XTAL2
Output of the inverting 16MHz crystal oscillator amplifier.
7
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
3.2.19 TST
Programming and test mode enable pin. If pin TST is not used pull it to low.
3.2.20 CLKI
Input to the clock system. If selected, it provides the operating clock of the
microcontroller.
3.3 Unused Pins
Floating pins can cause power dissipation in the digital input stage. They should be
connected to an appropriate source. In normal operation modes the internal pull-up
resistors can be enabled (in Reset all GPIO are configured as input and the pull-up
resistors are still not enabled).
Bi-directional I/O pins shall not be connected to ground or power supply directly.
The digital input pins TST and CLKI must be connected. If unused pin TST can be
connected to AVSS while CLKI should be connected to DVSS.
Output pins are driven by the device and do not float. Power supply pins respective
ground supply pins are connected together internally.
XTAL1 and XTAL2 shall never be forced to supply voltage at the same time.
3.4 Compatibility and Feature Limitations of QFN-48 Package
3.4.1 AREF
The reference voltage output of the A/D converter is not connected to a pin in the
ATmega2564/1284/644RFR2.
3.4.2 Port E6
The port E6 is not connected to a pin in the ATmega2564/1284/644RFR2. The alternate
pin functions as clock input to timer 3 and external interrupt 6 are not available.
3.4.3 Port F3 and F4
The port F3 and F4 are connected to the same pin in the ATmega2564/1284/644RFR2.
The output configuration should be done carefully in order to avoid excessive current
consumption.
The alternate pin function of port F4 is used by the JTAG interface. If the JTAG
interface is used the port F3 must be configured as input and the alternate pin function
output DIG4 (RX/TX indicator) must be disabled. Otherwise the JTAG interface will not
work. The SPIEN Fuse should be programmed in order to be able to erase a program
that accidentally drive port F3.
There are just 7 single-ended input channel to the ADC available.
3.4.4 Port G0
The port G0 is not connected to a pin in the ATmega2564/1284/644RFR2. The
alternate pin function DIG3 (inverted RX/TX indicator) is not available. If the JTAG
interface is not used the DIG4 alternate pin function output of port F3 can still be used
as RX/TX indicator.
8
42073BS-MCU Wireless-09/14
3.4.5 Port G2
The port G2 is not connected to a pin in the ATmega2564/1284/644RFR2. The
alternate pin function AMR (asynchronous automated meter reading input to timer 2) is
not available.
3.4.6 Port G5
The port G5 is not connected to a pin in the ATmega2564/1284/644RFR2. The
alternate pin function OC0B (output compare channel of 8-Bit timer 0) is not available.
3.4.7 RSTON
The RSTON reset output signaling the internal reset state is not connected to a pin in
the ATmega2564/1284/644RFR2.
3.5 Configuration summary
According to the application requirements a variable memory size allows to optimize
current consumption and leakage current.
Table 3-1 Memory Configuration
Device Flash EEPROM SRAM
ATmega2564RFR2 256KB 8KB 32KB
ATmega1284RFR2 128KB 4KB 16KB
ATmega644RFR2 64KB 2KB 8KB
Package and associated pin configuration are the same for all devices providing full
functionality to the application.
Table 3-2 System Configuration
Device Package GPIO Serial IF ADC channel
ATmega2564RFR2 QFN48 33 2 USART, SPI, TWI 7
ATmega1284RFR2 QFN48 33 2 USART, SPI, TWI 7
ATmega644RFR2 QFN48 33 2 USART, SPI, TWI 7
The devices are optimized for applications based on the ZigBee and the IEEE 802.15.4
specification. Having application stack, network layer, sensor interface and an excellent
power control combined in a single chip many years of operation should be possible.
Table 3-3 Application Profile
Device Application
ATmega2564RFR2 Large Network Coordinator / Router for IEEE 802.15.4 / ZigBee Pro
ATmega1284RFR2 Network Coordinator / Router for IEEE 802.15.4
ATmega644RFR2 End node device / network processor
9
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
4 Application Circuits
4.1 Basic Application Schematic
A basic application schematic of the ATmega2564/1284/644RFR2 with a single-ended
RF connector is shown in Figure 4-1 below and the associated Bill of Material in Table
4-1 on page 10. The 50Ω single-ended RF input is transformed to the 100Ω differential
RF port impedance using Balun B1. The capacitors C1 and C2 provide AC coupling of
the RF input to the RF port, capacitor C4 improves matching.
Figure 4-1. Basic Application schematic (48-pin package)
6
5
4
3
2
1
13 14 15 16 17 18 19 20
4041424344454647
PF0
AVSS
RFP
RFN
AVSS
TST
DVSS
DVDD
XTAL2
DEVDD AVDD
EVDD
AVSS
XTAL1
31
32
33
34
35
36
PE0
CB3
CB4
RSTN
VDD
XTAL
CX1 CX2
CB1
VDD
CB2
B1
RF
C4
21 22 23 24
12
11
10
9
8
7
48 3839 37
25
26
27
28
29
30
XTAL
32kHz
CX3 CX4
CLKI
PB0
PB7
PE7
PE5
PF7
PG1
PD0
Pins TST & CLKI
must be connected
PG3
PD7
PG4
PF3/4
C1
The power supply bypass capacitors (CB2, CB4) are connected to the external analog
supply pin (EVDD, pin 44) and external digital supply pin (DEVDD, pin 16). The
capacitor C1 provides the required AC coupling of RFN/RFP.
Floating pins can cause excessive power dissipation (e.g. during power on). They
should be connected to an appropriate source. GPIO shall not be connected to ground
or power supply directly.
The digital input pins TST and CLKI must be connected. If pin TST will never be used it
can be connected to AVSS while an unused pin CLKI could be connected to DVSS (see
chapter "Unused Pins" on page 7).
Capacitors CB1 and CB3 are bypass capacitors for the integrated analog and digital
voltage regulators to ensure stable operation and to improve noise immunity.
Capacitors should be placed as close as possible to the pins and should have a low-
resistance and low-inductance connection to ground to achieve the best performance.
10
42073BS-MCU Wireless-09/14
The crystal (XTAL), the two load capacitors (CX1, CX2), and the internal circuitry
connected to pins XTAL1 and XTAL2 form the 16MHz crystal oscillator for the 2.4GHz
transceiver. To achieve the best accuracy and stability of the reference frequency, large
parasitic capacitances must be avoided. Crystal lines should be routed as short as
possible and not in proximity of digital I/O signals. This is especially required for the
High Data Rate Modes.
The 32.768 kHz crystal connected to the internal low power (sub 1µA) crystal oscillator
provides a stable time reference for all low power modes including 32 Bit IEEE 802.15.4
Symbol Counter ("MAC Symbol Counter") and real time clock application using the
asynchronous timer T/C2 ("Timer/Counter2 with PWM and Asynchronous Operation").
Total shunt capacitance including CX3, CX4 should not exceed 15pF across both pins.
The very low supply current of the oscillator requires careful layout of the PCB and any
leakage path must be avoided.
Crosstalk and radiation from switching digital signals to the crystal pins or the RF pins
can degrade the system performance. The programming of minimum drive strength
settings for the digital output signal is recommended (see "DPDS0 - Port Driver
Strength Register 0").
Table 4-1. Bill of Materials (BoM)
Designator Description Value Manufacturer Part Number Comment
B1 SMD balun
SMD balun / filter
2.4 GHz Wuerth
Johanson
Technology
748421245
2450FB15L0001
Filter included
CB1
CB3
LDO VREG
bypass capacitor
1 µF
(100nF minimum)
AVX
Murata
0603YD105KAT2A
GRM188R61C105KA12D
X5R
(0603)
10% 16V
CB2
CB4
Power supply bypass
capacitor
1 µF
(100nF minimum)
CX1, CX2
16MHz crystal load
capacitor
12 pF
AVX
Murata
06035A120JA
GRP1886C1H120JA01
COG
(0603)
5% 50V
CX3, CX4 32.768kHz crystal load
capacitor
12 … 25 pF
C1, C2
RF coupling capacitor
22 pF
Epcos
Epcos
AVX
B37930
B37920
06035A220JAT2A
C0G 5% 50V
(0402 or 0603)
C4 (optional)
RF matching 0.47 pF Johnstech
XTAL Crystal CX-4025 16 MHz
SX-4025 16 MHz
ACAL Taitjen
Siward
XWBBPL-F-1
A207-011
XTAL 32kHz Crystal Rs=100 kOhm
11
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
5 Revision history
Please note that the referring page numbers in this section are referring to this
document. The referring revision in this section are referring to the document revision
Rev. 42073BS-MCU Wireless-09/14
1. Content unchanged - recreated for combined release with the datasheet.
Rev. 8393AS-MCU Wireless-02/13
1. Initial release.
12
42073BS-MCU Wireless-09/14
Table of Contents
Features .................................................................................................. 1
Applications ........................................................................................... 1
1 Pin Configurations .............................................................................. 2
2 Disclaimer ............................................................................................ 2
3 Overview .............................................................................................. 3
3.1 Block Diagram ........................................................................................................ 3
3.2 Pin Descriptions...................................................................................................... 5
3.3 Unused Pins ........................................................................................................... 7
3.4 Compatibility and Feature Limitations of QFN-48 Package ................................... 7
3.5 Configuration summary .......................................................................................... 8
4 Application Circuits ............................................................................ 9
4.1 Basic Application Schematic .................................................................................. 9
5 Revision history ................................................................................ 11
Table of Contents ................................................................................. 12
13
42073BS-MCU Wireless-09/14
ATmega2564/1284/644
RFR2
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ATMEGA644RFR2-ZU ATMEGA2564RFR2-ZF ATMEGA644RFR2-ZF ATMEGA644RFR2-ZUR
ATMEGA1284RFR2-ZU ATMEGA2564RFR2-ZFR ATMEGA1284RFR2-ZFR ATMEGA1284RFR2-ZUR
ATMEGA644RFR2-ZFR ATMEGA2564RFR2-ZU ATMEGA1284RFR2-ZF