ATMEGA164P-20AUR - Atmel - Datasheet.Directory

Features

•High-performance, Low-power AVR® 8-bit Microcontroller

•Advanced RISC Architecture

– 131 Powerful Instructions – Most Single-clock Cycle Execution

– 32 x 8 General Purpose Working Registers

– Fully Static Operation

– Up to 20 MIPS Thro ug hp ut at 20 MHz

•High Endurance Non-volatile Memory segments

– 64K Bytes of In-System Self-programmable Flash program memory

– 2K Bytes EEPROM

– 4K Bytes Internal SRAM

– Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3)

– Data retention: 20 years at 85°C/100 years at 25°C(2)(3)

– Optional Boot Code Section wi th Independent Lock Bits

In-System Programming by On-chip Boot Prog ram

True Read-While-Write Operatio n

– Programming Lock for Software Security

•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

– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture

Mode

– Real Time Counter with Separate Oscillator

– Six PWM Channels

– 8-channel, 10-bit ADC

Differential mode with selectable gain at 1x, 10x or 200x

– Byte-oriented Two-wire Serial Interface

– One Programmable Serial USART

– Master/Slave SPI Serial Interface

– Programmable Watchdog Timer with Separate On-chip Oscillator

– On-chip Analog Comparator

– Interrupt and Wake-up on Pin Change

•Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated RC Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby

and Extended Standby

•I/O and Packages

– 32 Programmable I/O Lines

– 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF

•Speed Grades

– ATmega644V: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V

– ATmega644: 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V

•Power Consumption at 1 MHz, 3V, 25°C for

– Active: 240 µA @ 1.8V, 1MHz

– Power-down Mode: 0.1 µA @ 1.8V

Notes: 1. W o rst case temperature. Guaranteed after last write cycle.

2. Failure rate less than 1 ppm.

3. Characteri zed through accelerated tests.

8-bit

Microcontroller

with 64K Bytes

In-System

Programmable

Flash

ATmega644/V

Preliminary

Summary

2593MS–AVR–08/07

22593MS–AVR–08/07

ATmega644

1. Pin Configurations

Figure 1-1. Pinout ATmega644

Note: The large center pad underneath the QFN/MLF package should be soldered to ground on the

board to ensure good mechanical stability.

(PCINT8/XCK0/T0) PB0

(PCINT9/CLKO/T1) PB1

(PCINT10/INT2/AIN0) PB2

(PCINT11/OC0A/AIN1) PB3

(PCINT12/OC0B/SS) PB4

(PCINT13/MOSI) PB5

(PCINT14/MISO) PB6

(PCINT15/SCK) PB7

RESET

VCC

GND

XTAL2

XTAL1

(PCINT24/RXD0) PD0

(PCINT25/TXD0) PD1

(PCINT26/INT0) PD2

(PCINT27/INT1) PD3

(PCINT28/OC1B) PD4

(PCINT29/OC1A) PD5

(PCINT30/OC2B/ICP) PD6

PA0 (ADC0/PCINT0)

PA1 (ADC1/PCINT1)

PA2 (ADC2/PCINT2)

PA3 (ADC3/PCINT3)

PA4 (ADC4/PCINT4)

PA5 (ADC5/PCINT5)

PA6 (ADC6/PCINT6)

PA7 (ADC7/PCINT7)

AREF

GND

AVCC

PC7 (TOSC2/PCINT23)

PC6 (TOSC1/PCINT22)

PC5 (TDI/PCINT21)

PC4 (TDO/PCINT20)

PC3 (TMS/PCINT19)

PC2 (TCK/PCINT18)

PC1 (SDA/PCINT17)

PC0 (SCL/PCINT16)

PD7 (OC2A/PCINT31)

PA4 (ADC4/PCINT4)

PA5 (ADC5/PCINT5)

PA6 (ADC6/PCINT6)

PA7 (ADC7/PCINT7)

AREF

GND

AVCC

PC7 (TOSC2/PCINT23)

PC6 (TOSC1/PCINT22)

PC5 (TDI/PCINT21)

PC4 (TDO/PCINT20)

(PCINT13/MOSI) PB5

(PCINT14/MISO) PB6

(PCINT15/SCK) PB7

RESET

VCC

GND

XTAL2

XTAL1

(PCINT24/RXD0) PD0

(PCINT25/TXD0) PD1

(PCINT26/INT0) PD2

(PCINT27/INT1) PD3

(PCINT28/OC1B) PD4

(PCINT29/OC1A) PD5

(PCINT30/OC2B/ICP) PD6

(PCINT31/OC2A) PD7

VCC

GND

(PCINT16/SCL) PC0

(PCINT17/SDA) PC1

(PCINT18/TCK) PC2

(PCINT19/TMS) PC3

PB4 (SS/OC0B/PCINT12)

PB3 (AIN1/OC0A/PCINT11)

PB2 (AIN0/INT2/PCINT10)

PB1 (T1/CLKO/PCINT9)

PB0 (XCK0/T0/PCINT8)

GND

VCC

PA0 (ADC0/PCINT0)

PA1 (ADC1/PCINT1)

PA2 (ADC2/PCINT2)

PA3 (ADC3/PCINT3)

PDIP

TQFP/QFN/MLF

2593MS–AVR–08/07

ATmega644

1.1 Disclaimer

Typical values contained in this datasheet are based on simulations and characterization of

other AVR micr ocontr ollers m anufa ct ured o n th e same proce ss tech nolo gy. Min a nd Ma x valu es

will be available after the device is characterized.

2. Overview

The ATmega644 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC

architecture. By executing powerful instructions in a single clock cycle, the ATmega644

achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize

power consumption versus proc essing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

CPU

GND

VCC

RESET

Power

Supervision

POR / BOD &

RESET

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

XTAL1

XTAL2

PORT A (8)

PORT D (8)

PD7..0

PORT C (8)

PC7..0

TWI

SPI

EEPROM

JTAG 8bit T/C 0

8bit T/C 2

16bit T/C 1

SRAMFLASH

USART 0

Internal

Bandgap reference

Analog

Comparator

A/D

Converter

PA7..0

PORT B (8)

PB7..0

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ATmega644

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achiev ing throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATmega644 provides the following features: 64K bytes of In-System Programmable Flash

with Read-While-Write capabilities, 2K bytes EEPROM, 4K bytes SRAM, 32 general purpose I/O

lines, 32 general purpose working registers, Real Time Counter (RTC), three flexible

Timer/Counters with compare modes and PWM, 2 USARTs, a byte oriented 2-wire Serial Inter-

face, a 8-channel, 10-bit ADC with optional differential input stage with programmable gain,

programmab le Watchdog Timer with Internal Oscillator , an SPI serial port, IEEE std. 1149.1

compliant JTAG test interface, also used for accessing the On-chip Debug system and program-

ming and six software selectable p ower 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 Re ducti on mode stop s the CPU an d all I /O modu les exce pt Asynchr o-

nous Timer and ADC, to minimize switching noise during ADC conversions. In Standby mode,

the Crystal/Resonator 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 Oscillator and the Asynchronous Timer continue to run.

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 through an SPI serial

interface, by a conventional nonvolatile memory programm er, or by an On-chip Boot program

running on the AVR core. The boot progra m 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 Rea d-While-Write operation. By

combining an 8-bit RISC CPU with In-System Self-P rogrammable Flash on a monolithic chip,

the Atmel ATmega64 4 is a powerf ul microcontro ller that p rovides a highly f lexible and cost effec-

tive solution to many embedded control applications.

The ATmega644 AVR is supported with a full suite of program and system development tools

including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators,

and evaluation kits.

2.2 Pin Descriptions

2.2.1 VCC

Digital supply voltage.

2.2.2 GND

Ground.

2.2.3 Port A (PA7:PA0)

Port A serves as analog inputs to the Analog-to-digital Converter.

Port A also serves as an 8-bit bi-directional I/O port with internal pull-up resistors (selected for

each bit). The Port A output buffers have symmetrical drive characteristics with both high sink

2593MS–AVR–08/07

ATmega644

and source capability. As inputs, Port A pins that are externally pulled low will source current if

the pull-up resistor s are activated. The Por t A pins are tri-stated when a reset condition becomes

active, even if the clock is not running.

Port A also serves the functions of various special features of the ATmega644 as listed on page

73.

2.2.4 Port B (PB7:PB0)

Port B is an 8-bit bi-directional I/O port with intern al pull-up resistors (selec ted 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. Th e Port B pins are tri-stated when a reset co ndition becomes active,

even if the clock is not running.

Port B also serves the functions of various special features of the ATmega644 as listed on page

75.

2.2.5 Port C (PC7:PC0)

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port C output buffers have symmetrical drive characteristics with both hig h sink and source

capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port C also serves the functions of the JTAG interface, along with special features of the

ATmega644 as listed on page 78.

2.2.6 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 hig h 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 serves the functions of various special features of the ATmega644 as listed on page

80.

2.2.7 RESET

Reset input. A low level on this pin for longer than the minimum pulse length will gen erate a

reset, even if the clock is not running. The minimum pulse length is given in ”System and Reset

Characteristics” on page 320. Shorter pulses are not guaranteed to generate a reset.

2.2.8 XTAL1

Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.

2.2.9 XTAL2

Output from the inverting Oscillator amplifier.

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ATmega644

2.2.10 AVCC

AVCC is the supply voltage pin for Port F and the A nalog-to -digital Conver ter. It should be exter-

nally connected to VCC, even if the ADC is not used. If the ADC is used , it should b e connecte d

to VCC through a low-pass filter.

2.2.11 AREF

This is the analog reference pin for the Analog-to-digi tal Converter.

3. Resources

A comprehensive set of development tools, application note s and datasheetsare available for

download on http://www.atmel.com/avr.

2593MS–AVR–08/07

ATmega644

4. Register Summary

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page

(0xFF) Reserved - - - - - - -

(0xFE) Reserved - - - - - - - -

(0xFD) Reserved - - - - - - - -

(0xFC) Reserved - - - - - - - -

(0xFB) Reserved - - - - - - -

(0xFA) Reserved - - - - - - - -

(0xF9) Reserved - - - - - - -

(0xF8) Reserved - - - - - - - -

(0xF7) Reserved - - - - - - - -

(0xF6) Reserved - - - - - - - -

(0xF5) Reserved - - - - - - -

(0xF4) Reserved - - - - - - - -

(0xF3) Reserved - - - - - - - -

(0xF2) Reserved - - - - - - - -

(0xF1) Reserved - - - - - - -

(0xF0) Reserved - - - - - - - -

(0xEF) Reserved - - - - - - -

(0xEE) Reserved - - - - - - - -

(0xED) Reserved - - - - - - - -

(0xEC) Reserved - - - - - - - -

(0xEB) Reserved - - - - - - -

(0xEA) Reserved - - - - - - - -

(0xE9) Reserved - - - - - - - -

(0xE8) Reserved - - - - - - - -

(0xE7) Reserved - - - - - - -

(0xE6) Reserved - - - - - - - -

(0xE5) Reserved - - - - - - - -

(0xE4) Reserved - - - - - - - -

(0xE3) Reserved - - - - - - -

(0xE2) Reserved - - - - - - - -

(0xE1) Reserved - - - - - - -

(0xE0) Reserved - - - - - - -

(0xDF) Reserved - - - - - - - -

(0xDE) Reserved - - - - - - - -

(0xDD) Reserved - - - - - - - -

(0xDC) Reserved - - - - - - -

(0xDB) Reserved - - - - - - - -

(0xDA) Reserved - - - - - - - -

(0xD9) Reserved - - - - - - - -

(0xD8) Reserved - - - - - - - -

(0xD7) Reserved - - - - - - - -

(0xD6) Reserved - - - - - - - -

(0xD5) Reserved - - - - - - - -

(0xD4) Reserved - - - - - - - -

(0xD3) Reserved - - - - - - - -

(0xD2) Reserved - - - - - - - -

(0xD1) Reserved - - - - - - - -

(0xD0) Reserved - - - - - - - -

(0xCF) Reserved - - - - - - - -

(0xCE) Reserved - - - - - - - -

(0xCD) Reserved - - - - - - - -

(0xCC) Reserved - - - - - - - -

(0xCB) Reserved - - - - - - - -

(0xCA) Reserved - - - - - - - -

(0xC9) Reserved - - - - - - - -

(0xC8) Reserved - - - - - - - -

(0xC7) Reserved - - - - - - - -

(0xC6) UDR0 USART0 I/O Data Register 182

(0xC5) UBRR0H - - - - USART0 Baud Rate Register High Byte 186/198

(0xC4) UBRR0L USART0 Baud Rate Register Low Byte 186/198

(0xC3) Reserved - - - - - - - -

(0xC2) UCSR0C UMSEL01 UMSEL00 UPM01 UPM00 USBS0 UCSZ01 UCSZ00 UCPOL0 184/197

(0xC1) UCSR0B RXCIE0 TXCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80 183/197

(0xC0) UCSR0A RXC0 TXC0 UDRE0 FE0 DOR0 UPE0 U2X0 MPCM0 182/196

82593MS–AVR–08/07

ATmega644

(0xBF) Reserved - - - - - - - -

(0xBE) Reserved - - - - - - - -

(0xBD) TWAMR TWAM6 TWAM5 TWAM4 TWAM3 TWAM2 TWAM1 TWAM0 -228

(0xBC) TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN -TWIE 225

(0xBB) TWDR 2-wire Serial Interface Da ta Register 227

(0xBA) TWAR TWA6 TWA5 TWA4 TWA3 TWA2 TWA1 TWA0 TWGCE 228

(0xB9) TWSR TWS7 TWS6 TWS5 TWS4 TWS3 - TWPS1 TWPS0 227

(0xB8) TWBR 2-wire Serial Interface Bit Rate Register 225

(0xB7) Reserved - - - - - - - -

(0xB6) ASSR - EXCLK AS2 TCN2UB OCR2AUB OCR2BUB TCR2AUB TCR2BUB 150

(0xB5) Reserved - - - - - - - -

(0xB4) OCR2B Timer/Counter2 Output Compare Register B 150

(0xB3) OCR2A Timer/Counter2 Output Compare Register A 150

(0xB2) TCNT2 Timer/Counter2 (8 Bit) 150

(0xB1) TCCR2B FOC2A FOC2B -- WGM22 CS22 CS21 CS20 149

(0xB0) TCCR2A COM2A1 COM2A0 COM2B1 COM2B0 -- WGM21 WGM20 146

(0xAF) Reserved - - - - - - - -

(0xAE) Reserved - - - - - - - -

(0xAD) Reserved - - - - - - - -

(0xAC) Reserved - - - - - - - -

(0xAB) Reserved - - - - - - - -

(0xAA) Reserved - - - - - - - -

(0xA9) Reserved - - - - - - - -

(0xA8) Reserved - - - - - - - -

(0xA7) Reserved - - - - - - - -

(0xA6) Reserved - - - - - - - -

(0xA5) Reserved - - - - - - - -

(0xA4) Reserved - - - - - - - -

(0xA3) Reserved - - - - - - - -

(0xA2) Reserved - - - - - - - -

(0xA1) Reserved - - - - - - - -

(0xA0) Reserved - - - - - - - -

(0x9F) Reserved - - - - - - - -

(0x9E) Reserved - - - - - - - -

(0x9D) Reserved - - - - - - - -

(0x9C) Reserved - - - - - - - -

(0x9B) Reserved - - - - - - - -

(0x9A) Reserved - - - - - - - -

(0x99) Reserved - - - - - - - -

(0x98) Reserved - - - - - - - -

(0x97) Reserved - - - - - - - -

(0x96) Reserved - - - - - - - -

(0x95) Reserved - - - - - - - -

(0x94) Reserved - - - - - - - -

(0x93) Reserved - - - - - - - -

(0x92) Reserved - - - - - - - -

(0x91) Reserved - - - - - - - -

(0x90) Reserved - - - - - - - -

(0x8F) Reserved - - - - - - - -

(0x8E) Reserved - - - - - - - -

(0x8D) Reserved - - - - - - - -

(0x8C) Reserved - - - - - - - -

(0x8B) OCR1BH Timer/Counter1 - Output Co mpare Register B High Byte 129

(0x8A) OCR1BL Timer/Counter1 - Output Compare Register B Low Byte 129

(0x89) OCR1AH Timer/Counter1 - Output Compare Reg i ster A High Byt e 129

(0x88) OCR1AL Timer/Counter1 - Output Compare Register A Low Byte 129

(0x87) ICR1H Timer/Counter1 - Input Capture Register High Byte 130

(0x86) ICR1L Timer/Counter 1 - Input Capture Register Low Byte 130

(0x85) TCNT1H Timer/Counter1 - Counter Register High Byte 129

(0x84) TCNT1L Timer/Counter1 - Counter Register Low Byte 129

(0x83) Reserved - - - - - - - -

(0x82) TCCR1C FOC1A FOC1B - - - - - -128

(0x81) TCCR1B ICNC1 ICES1 - WGM13 WGM12 CS12 CS11 CS10 127

(0x80) TCCR1A COM1A1 COM1A0 COM1B1 COM1B0 -- WGM11 WGM10 125

(0x7F) DIDR1 - - - - - -AIN1DAIN0D 232

(0x7E) DIDR0 ADC7D ADC6D ADC5D ADC4D ADC3D ADC2D ADC1D ADC0D 252

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page

2593MS–AVR–08/07

ATmega644

(0x7D) Reserved - - - - - - - -

(0x7C) ADMUX REFS1 REFS0 ADLAR MUX4 MUX3 MUX2 MUX1 MUX0 248

(0x7B) ADCSRB -ACME- - - ADTS2 ADTS1 ADTS0 231

(0x7A) ADCSRA ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0 249

(0x79) ADCH ADC Data Register High byte 251

(0x78) ADCL ADC Data Register Low byte 251

(0x77) Reserved - - - - - - - -

(0x76) Reserved - - - - - - - -

(0x75) Reserved - - - - - - - -

(0x74) Reserved - - - - - - - -

(0x73) PCMSK3 PCINT31 PCINT30 PCINT29 PCINT28 PCINT27 PCINT26 PCINT25 PCINT24 63

(0x72) Reserved - - - - - - - -

(0x71) Reserved - - - - - - - -

(0x70) TIMSK2 - - - - - OCIE2B OCIE2A TOIE2 152

(0x6F) TIMSK1 --ICIE1-- OCIE1B OCIE1A TOIE1 130

(0x6E) TIMSK0 - - - - - OCIE0B OCIE0A TOIE0 101

(0x6D) PCMSK2 PCINT23 PCINT22 PCINT21 PCINT20 PCINT19 PCINT18 PCINT17 PCINT16 63

(0x6C) PCMSK1 PCINT15 PCINT14 PCINT13 PCINT12 PCINT11 PCINT10 PCINT9 PCINT8 63

(0x6B) PCMSK0 PCINT7 PCINT6 PCINT5 PCINT4 PCINT3 PCINT2 PCINT1 PCINT0 64

(0x6A) Reserved - - - - - - - -

(0x69) EICRA -- ISC21 ISC20 ISC11 ISC10 ISC01 ISC00 60

(0x68) PCICR - - - - PCIE3 PCIE2 PCIE1 PCIE0 62

(0x67) Reserved - - - - - - - -

(0x66) OSCCAL Oscillator Calibration Register 37

(0x65) Reserved - - - - - - - -

(0x64) PRR PRTWI PRTIM2 PRTIM0 - PRTIM1 PRSPI PRUSART0 PRADC 44

(0x63) Reserved - - - - - - - -

(0x62) Reserved - - - - - - - -

(0x61) CLKPR CLKPCE - - - CLKPS3 CLKPS2 CLKPS1 CLKPS0 37

(0x60) WDTCSR WDIF WDIE WDP3 WDCE WDE WDP2 WDP1 WDP0 52

0x3F (0x5F) SREG I T H S V N Z C 11

0x3E (0x5E) SPH SP15 SP1 4 SP13 SP12 SP11 SP10 SP9 SP8 11

0x3D (0x5D) S PL S P7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 11

0x3C (0x5C) Reserved - - - - - - - -

0x3B (0x5B) Reserved - - - - - - - -

0x3A (0x5A) Reserved - - - - - - - -

0x39 (0x59) Reserved - - - - - - - -

0x38 (0x58) Reserved - - - - - - - -

0x37 (0x57) SPMCSR SPMIE RWWSB SIGRD RWWSRE BL BSE T PGWRT PGERS SPMEN 281

0x36 (0x56) Reserved - - - - - - - -

0x35 (0x55) MCUCR JTD --PUD-- IVSEL IVCE 84/267

0x34 (0x54) MCUSR - - - JTRF WDRF BORF EXTRF PORF 52/268

0x33 (0x53) SMCR - - - - SM2 SM1 SM0 SE 43

0x32 (0x52) Reserved - - - - - - - -

0x31 (0x51) OCDR On-Chip Debug Regi ste r 258

0x30 (0x50) ACSR ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 249

0x2F (0x4F) Reserved - - - - - - - -

0x2E (0x4E) SPDR SPI 0 Data Register 163

0x2D (0x4D) S PSR SPIF WCOL - - - - - SPI2X 162

0x2C (0x4C) S PCR SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 161

0x2B (0x4B) GPIOR2 General Purpose I/O Register 2 25

0x2A (0x4A) GPIOR1 General Purpose I/O Register 1 25

0x29 (0x49) Reserved - - - - - - - -

0x28 (0x48) OCR0B Timer/Counter0 Output Compare Register B 101

0x27 (0x47) OCR0A Timer/Counter0 Output Compare Register A 101

0x26 (0x46) TCNT0 Timer/Counter0 (8 Bit) 101

0x25 (0x45) TCCR0B FOC0A FOC0B -- WGM02 CS02 CS01 CS00 100

0x24 (0x44) TCCR0A COM0A1 COM0A0 COM0B1 COM0B0 -- WGM01 WGM00 101

0x23 (0x43) GTCCR TSM - - - - - PSRASY PSRSYNC 153

0x22 (0x42) EEARH - - - - EEPROM Address Register High Byte 21

0x21 (0x41) EEARL EEPROM Address Register Low Byt e 21

0x20 (0x40) EEDR EEPROM Data Regi ste r 21

0x1F (0x3F) EECR -- EEPM1 EEPM0 EERIE EEMPE EEPE EERE 21

0x1E (0x3E) GPIOR0 General Purpose I/O Register 0 26

0x1D (0x3D) EIMSK - - - - - INT2 INT1 INT0 61

0x1C (0x3C) EIFR - - - - - INTF2 INTF1 INTF0 61

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page

10 2593MS–AVR–08/07

ATmega644

Notes: 1. For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addre s ses

should never be written.

2. I/O registers within the address range $00 - $1F are directly bit-accessible using the SBI and CBI instructions. In these re g-

isters, the value of single bits can be checked by using the SBIS and SBIC instructions.

3. Some of the status flags are cleared by writing a logical one to them. Note that the CBI and SBI instr uctions will operate on

all bits in the I/O register, writing a one back into any flag read as set, thus clearing the flag. The CBI an d SBI instructions

work with regi ste r s 0x00 to 0x1F only.

4. When using the I/O specific commands IN and OUT, the I/O addresses $00 - $3F must be used. When addressing I/O regis-

ters as data space using LD and ST instructions, $20 must be added to these addresses. The ATmega644 is a complex

microcontroller with more peripheral units than can be supported within the 64 location reser ved in Opcode for the IN and

OUT instructions. For the Extended I/O space from $60 - $FF, only the ST/STS/STD and LD/LDS/LDD in structions can be

used.

0x1B (0x3B) PCIFR - - - - PCIF3 PCIF2 PCIF1 PCIF0 62

0x1A (0x3A) Reserved - - - - - - - -

0x19 (0x39) Reserved - - - - - - - -

0x18 (0x38) Reserved - - - - - - - -

0x17 (0x37) TIFR2 - - - - -OCF2bOCF2ATOV2 152

0x16 (0x36) TIFR1 --ICF1-- OCF1B OCF1A TOV1 131

0x15 (0x35) TIFR0 - - - - - OCF0B OCF0A TOV0 102

0x14 (0x34) Reserved - - - - - - - -

0x13 (0x33) Reserved - - - - - - - -

0x12 (0x32) Reserved - - - - - - - -

0x11 (0x31) Reserved - - - - - - - -

0x10 (0x30) Reserved - - - - - - - -

0x0F (0x2F) Reserved - - - - - - - -

0x0E (0x2E) Reserved - - - - - - - -

0x0D (0x2D) Reserved - - - - - - - -

0x0C (0x2C) Reserved - - - - - - - -

0x0B (0x2B) PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 85

0x0A (0x2A) DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 85

0x09 (0x29) PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 85

0x08 (0x28) PORTC PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 85

0x07 (0x27) DDRC DDC7 DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 85

0x06 (0x26) PINC PINC7 PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 85

0x05 (0x25) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 84

0x04 (0x24) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 84

0x03 (0x23) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 84

0x02 (0x22) PORTA PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 84

0x01 (0x21) DDRA DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 84

0x00 (0x20) PINA PINA7 PINA6 PINA5 PINA4 PINA3 PINA2 PINA1 PINA0 84

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page

2593MS–AVR–08/07

ATmega644

5. Instruction Set Summary

Mnemonics Operands Description Operation Flags #Clocks

ARITHMETIC AND LOGIC INSTRUCTIONS

ADD Rd, Rr Add two Registers Rd ← Rd + Rr Z,C,N,V,H 1

ADC Rd, Rr Add with Carry two Registers Rd ← Rd + Rr + C Z,C,N,V,H 1

ADIW Rdl,K Add Immediate to Word Rdh:Rdl ← Rdh:Rdl + K Z,C,N,V,S 2

SUB Rd, Rr Subtract two Registers Rd ← Rd - Rr Z,C,N,V,H 1

SUBI Rd, K Subtract Constant from Register Rd ← Rd - K Z,C,N,V,H 1

SBC Rd, Rr Subtract with Carry two Registers Rd ← Rd - Rr - C Z,C,N,V,H 1

SBCI Rd, K Subtract with Carry Constant from Reg. Rd ← Rd - K - C Z,C,N,V,H 1

SBIW Rdl,K Subtract Immediate from Word Rdh:Rdl ← Rdh:Rdl - K Z,C,N,V,S 2

AND Rd, Rr Logical AND Registers Rd ← Rd • Rr Z,N,V 1

ANDI Rd, K Logical AND Register and Constant Rd ← Rd • K Z,N,V 1

OR Rd, Rr Logical OR Registers Rd ← Rd v Rr Z,N,V 1

ORI Rd, K Logical OR Register and Constant Rd ← Rd v K Z,N,V 1

EOR Rd, Rr Exclusive OR Registers Rd ← Rd ⊕ Rr Z,N,V 1

COM Rd One’s Complement Rd ← 0xFF − Rd Z,C,N,V 1

NEG Rd Two’s Complement Rd ← 0x00 − Rd Z,C,N,V,H 1

SBR Rd,K Set Bit(s) in Register Rd ← Rd v K Z,N,V 1

CBR Rd,K Clear Bit(s) in Register Rd ← Rd • (0xFF - K) Z,N,V 1

INC Rd Increment Rd ← Rd + 1 Z,N,V 1

DEC Rd Decrement Rd ← Rd − 1 Z,N,V 1

TST Rd Test for Zero or Minus Rd ← Rd • Rd Z,N,V 1

CLR Rd Clear Register Rd ← Rd ⊕ Rd Z,N,V 1

SER Rd Set Register Rd ← 0xFF None 1

MUL Rd, Rr Multiply Unsigned R1:R0 ← Rd x Rr Z,C 2

MULS Rd, Rr Multiply Signed R1:R0 ← Rd x Rr Z,C 2

MULSU Rd, Rr Multiply Signed with Unsigned R1:R0 ← Rd x Rr Z,C 2

FMUL Rd, Rr Fractional Multiply Unsigned R1:R0 ← (Rd x Rr) << 1 Z,C 2

FMULS Rd, Rr Fractional Multiply Signed R1:R0 ← (Rd x Rr) << 1 Z,C 2

FMULSU Rd, Rr Fractional Multiply Signed with Unsig ne d R1:R0 ← (Rd x Rr) << 1 Z,C 2

BRANCH INSTRUCTIONS

RJMP k Relative Jump PC ← PC + k + 1 None 2

IJMP Indirect Jump to (Z) PC ← Z None 2

JMP k Direct Jump PC ← kNone3

RCALL k Relative Subroutine Cal l PC ← PC + k + 1 None 4

ICALL Indirect Call to (Z) PC ← ZNone4

CALL k Direct Subroutine Call PC ← kNone5

RET Subroutine Return PC ← STACK None 5

RETI Interrupt Return PC ← STACK I 5

CPSE Rd,Rr Compare, Skip if Equal if (Rd = Rr) PC ← PC + 2 or 3 None 1/2/3

CP Rd,Rr Compare Rd − Rr Z, N,V,C,H 1

CPC Rd,Rr Compare with Carry Rd − Rr − C Z, N,V,C,H 1

CPI Rd,K Compare Reg ister with Immediate Rd − K Z, N,V,C,H 1

SBRC Rr, b Skip if Bit in Register Cleared if (Rr(b)=0) PC ← PC + 2 or 3 None 1/2/3

SBRS Rr, b Skip if Bit in Register is Set if (Rr(b)=1) PC ← PC + 2 or 3 None 1/2/3

SBIC P, b Skip if Bit in I/O Register Cleared if (P(b)=0) PC ← PC + 2 or 3 None 1/2/3

SBIS P, b Skip if Bit in I/O Register is Set if (P(b)=1) PC ← PC + 2 or 3 None 1/2/3

BRBS s, k Branch if Status Flag Set if (SREG(s ) = 1) then PC←PC+k + 1 None 1/2

BRBC s, k Bran ch if Status Flag Cleared if (SREG(s) = 0) then PC←PC+k + 1 None 1/2

BREQ k Branch if Equal if (Z = 1) then PC ← PC + k + 1 None 1/2

BRNE k Branch if Not Equal if (Z = 0) then PC ← PC + k + 1 None 1/2

BRCS k Branch if Carry Set if (C = 1) then PC ← PC + k + 1 None 1/2

BRCC k Branch if Carry Clea red if (C = 0) then PC ← PC + k + 1 None 1/2

BRSH k Branch if Same or Higher if (C = 0) then PC ← PC + k + 1 None 1/2

BRLO k Branch if Lower if (C = 1) then PC ← PC + k + 1 None 1/2

BRMI k Branch if Minus if (N = 1) then PC ← PC + k + 1 None 1/2

BRPL k Branch if Plus if (N = 0) then PC ← PC + k + 1 None 1/2

BRGE k Branch if Greater or Equal, Signed if (N ⊕ V= 0) then PC ← PC + k + 1 None 1/2

BRLT k Branch if Less Than Zero, Signed if (N ⊕ V= 1) then PC ← PC + k + 1 None 1/2

BRHS k Branch if Half Carry Flag Set if (H = 1) then PC ← PC + k + 1 None 1/2

BRHC k Branch if Half Carry Flag Cleared if (H = 0) then PC ← PC + k + 1 None 1/2

BRTS k Branch if T Flag Set if (T = 1) then PC ← PC + k + 1 None 1/2

BRTC k Branch if T Flag Cleared if (T = 0) then PC ← PC + k + 1 Non e 1/2

BRVS k Branch if Overflow Flag is Set if (V = 1) then PC ← PC + k + 1 None 1/2

12 2593MS–AVR–08/07

ATmega644

BRVC k Branch if Overflow Flag is Cleared if (V = 0) then PC ← PC + k + 1 None 1/2

BRIE k Branch if Interrupt Enabled if ( I = 1) then PC ← PC + k + 1 None 1/2

BRID k Branch if Interrupt Disabled if ( I = 0) then PC ← PC + k + 1 None 1/2

BIT AND BIT-TEST INSTRUCTIONS

SBI P,b Set Bit in I/O Register I/O(P,b) ← 1None2

CBI P,b Clear Bit in I/O Register I/O(P,b) ← 0None2

LSL Rd Logical Shift Left Rd(n+1) ← Rd(n), Rd(0) ← 0 Z,C,N,V 1

LSR Rd Logical Shift Right Rd(n) ← Rd(n+1), Rd(7) ← 0 Z,C,N,V 1

ROL Rd Rotate Left Through Carry Rd(0)←C,Rd(n+1)← Rd(n),C←Rd(7) Z,C,N,V 1

ROR Rd Rotate Right Through Carry Rd(7)←C,Rd(n)← Rd(n+1),C←Rd(0) Z,C,N,V 1

ASR Rd Arithmetic Shift Right Rd(n) ← Rd(n+1), n=0..6 Z,C,N,V 1

SWAP Rd Swap Nibbles Rd(3..0)←Rd(7..4),Rd(7..4)←Rd(3..0) None 1

BSET s Flag Set SREG(s) ← 1 SREG(s) 1

BCLR s Flag Clear SREG(s) ← 0 SREG(s) 1

BST Rr, b Bit Store from Register to T T ← Rr(b) T 1

BLD Rd, b Bit load from T to Register Rd(b) ← TNone1

SEC Set Carry C ← 1C1

CLC Clear Carry C ← 0 C 1

SEN Set Negative Flag N ← 1N1

CLN Clear Negative Flag N ← 0 N 1

SEZ Set Zero Flag Z ← 1Z1

CLZ Clear Zero Flag Z ← 0 Z 1

SEI Global Interrupt Enable I ← 1I1

CLI Global Interrupt Disable I ← 0 I 1

SES Set Signed Test Flag S ← 1S1

CLS Clear Signed Test Flag S ← 0 S 1

SEV Set Twos Complement Overflow. V ← 1V1

CLV Clear Twos Complement Overflow V ← 0 V 1

SET Set T in SREG T ← 1T1

CLT Clear T in SREG T ← 0 T 1

SEH Set Half Carry Flag in SREG H ← 1H1

CLH Clear Half Carry Flag in SREG H ← 0 H 1

DATA TRANSFER INSTRUCTIONS

MOV Rd, Rr Move Between Registers Rd ← Rr None 1

MOVW Rd, Rr Copy Register Word Rd+1:Rd ← Rr+1:Rr None 1

LDI Rd, K Load Immediate Rd ← KNone1

LD Rd, X Load Indirect Rd ← (X) N one 2

LD Rd, X+ Load Indirect and Post-Inc. Rd ← (X), X ← X + 1 None 2

LD Rd, - X Load Indirect and Pre-Dec. X ← X - 1, Rd ← (X) None 2

LD Rd, Y Load Indirect Rd ← (Y) N one 2

LD Rd, Y+ Load Indirect and Post-Inc. Rd ← (Y), Y ← Y + 1 None 2

LD Rd, - Y Load Indirect and Pre-Dec. Y ← Y - 1, Rd ← (Y) None 2

LDD Rd,Y+q Load Indirect with Displacement Rd ← (Y + q) None 2

LD Rd, Z Load Indirect Rd ← (Z) None 2

LD Rd, Z+ Load Indirect and Post-Inc. Rd ← (Z), Z ← Z+1 None 2

LD Rd, -Z Load Indirect and Pre-Dec. Z ← Z - 1, Rd ← (Z) None 2

LDD Rd, Z+q Load Indirect with Displacement Rd ← (Z + q) None 2

LDS Rd, k Load Direct from SRAM Rd ← (k) None 2

ST X, Rr Store Indirect (X) ← Rr None 2

ST X+, Rr Store Indirect and Post-Inc. (X) ← Rr, X ← X + 1 None 2

ST - X, Rr Store Indirect and Pre-Dec. X ← X - 1, (X) ← Rr None 2

ST Y, Rr Store Indirect (Y) ← Rr None 2

ST Y+, Rr Store Indirect and Post-Inc. (Y) ← Rr, Y ← Y + 1 None 2

ST - Y, Rr Store Indirect and Pre-Dec. Y ← Y - 1, (Y) ← Rr None 2

STD Y+q,Rr Store Indirect with Displacement (Y + q) ← Rr None 2

ST Z, Rr Store Indirect ( Z ) ← Rr None 2

ST Z+, Rr Store Indirect and Post-Inc. (Z) ← Rr, Z ← Z + 1 None 2

ST -Z, Rr Store Indirect and Pre-Dec. Z ← Z - 1, (Z) ← Rr None 2

STD Z+q,Rr Store Indirect with Displacement (Z + q) ← Rr None 2

STS k, Rr Store Direct to SRAM (k) ← Rr None 2

LPM Load Program Memory R0 ← (Z) None 3

LPM Rd, Z Loa d Program Memory Rd ← (Z) None 3

LPM Rd, Z+ Load Program Memory and P ost-Inc Rd ← (Z), Z ← Z+1 None 3

ELPM Rd, Z Extended Load Program Memory Rd ← (Z) None 3

SPM Store Program Memory (Z) ← R1:R0 Non e -

IN Rd, P In Port Rd ← PNone1

Mnemonics Operands Description Operation Flags #Clocks

2593MS–AVR–08/07

ATmega644

OUT P, Rr Out Port P ← Rr None 1

PUSH Rr Push Register on Stack STACK ← Rr None 2

POP Rd Pop Register from Stack Rd ← STACK None 2

MCU CONTROL INSTRUCTIONS

NOP No Operation None 1

SLEEP Sleep (see specific descr. for Sleep function) None 1

WDR Watchdog Reset (see specific descr. for WDR/timer) None 1

BREAK Break For On-chip Debug Only None N/A

Mnemonics Operands Description Operation Flags #Clocks

14 2593MS–AVR–08/07

ATmega644

6. Ordering Information

6.1 ATmega644

Note: 1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information

and minimum quantities.

2. Pb-free packaging, complies to the European Directive f or Restriction of Hazardous Substances (RoHS directive). Also

Halide free and fully Green.

3. For Speed vs. VCC see ”Speed Grades” on page 318.

Speed (MHz)(3) Power Supply Ordering Code(2) Package(1) Operational Range

10 1.8 - 5.5V ATmega644V-10AU

ATmega644V-10PU

ATmega644V-10MU

44A

40P6

44M1

Industrial

(-40oC to 85oC)

20 2.7 - 5.5V ATmega644-20AU

ATmega644-20PU

ATmega644-20MU

44A

40P6

44M1

Industrial

(-40oC to 85oC)

Package Type

44A 44-lead, Thin (1.0 mm) Plastic Gull Wing Quad Flat Package (TQFP)

40P6 40-pin, 0.600” Wide, Plastic Dual Inline Package (PDIP)

44M1 44-pad, 7 x 7 x 1.0 mm body, lead pitch 0.50 mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF)

2593MS–AVR–08/07

ATmega644

7. Packaging Information

7.1 44A

2325 Orchard Parkway

San Jose, CA 95131

TITLE DRAWING NO.

REV.

44A, 44-lead, 10 x 10 mm Body Size, 1.0 mm Body Thickness,

0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) B

44A

10/5/2001

PIN 1 IDENTIFIER

0˚~7˚

PIN 1

A1 A2 A

eE1 E

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

Notes: 1. This package conforms to JEDEC reference MS-026, Variation ACB.

2. Dimensions D1 and E1 do not include mold protrusion. Allowable

protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum

plastic body size dimensions including mold mismatch.

3. Lead coplanarity is 0.10 mm maximum.

A – – 1.20

A1 0.05 – 0.15

A2 0.95 1.00 1.05

D 11.75 12.00 12.25

D1 9.90 10.00 10.10 Note 2

E 11.75 12.00 12.25

E1 9.90 10.00 10.10 Note 2

B 0.30 – 0.45

C 0.09 – 0.20

L 0.45 – 0.75

e 0.80 TYP

16 2593MS–AVR–08/07

ATmega644

7.2 40P6

2325 Orchard Parkway

San Jose, CA 95131

TITLE DRAWING NO.

REV.

40P6, 40-lead (0.600"/15.24 mm Wide) Plastic Dual

Inline Package (PDIP) B

40P6

09/28/01

REF

SEATING PLANE

0º ~ 15º

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A – – 4.826

A1 0.381 – –

D 52.070 – 52.578 Note 2

E 15.240 – 15.875

E1 13.462 – 13.970 Note 2

B 0.356 – 0.559

B1 1.041 – 1.651

L 3.048 – 3.556

C 0.203 – 0.381

eB 15.494 – 17.526

e 2.540 TYP

Notes: 1. This package conforms to JEDEC reference MS-011, Variation AC.

2. Dimensions D and E1 do not include mold Flash or Protrusion.

Mold Flash or Protrusion shall not exceed 0.25 mm (0.010").

2593MS–AVR–08/07

ATmega644

7.3 44M1

2325 Orchard Parkway

San Jose, CA 95131

TITLE DRAWING NO.

REV.

44M1, 44-pad, 7 x 7 x 1.0 mm Body, Lead Pitch 0.50 mm,

44M1

5/27/06

COMMON DIMENSIONS

(Unit of Measure = mm)

SYMBOL MIN NOM MAX NOTE

A 0.80 0.90 1.00

A1 – 0.02 0.05

A3 0.25 REF

b 0.18 0.23 0.30

D2 5.00 5.20 5.40

6.90 7.00 7.10

E2 5.00 5.20 5.40

e 0.50 BSC

L 0.59 0.64 0.69

K 0.20 0.26 0.41

Note: JEDEC Standard MO-220, Fig. 1 (SAW Singulation) VKKD-3.

TOP VIEW

SIDE VIEW

BOTTOM VIEW

Marked Pin# 1 ID

Pin #1 Corner

SEATING PLANE

Pin #1

Triangle

Pin #1

Chamfer

(C 0.30)

Option A

Option B

Pin #1

Notch

(0.20 R)

Option C

5.20 mm Exposed Pad, Micro Lead Frame Package (MLF)

18 2593MS–AVR–08/07

ATmega644

8. Errata

8.1 Rev. C

•Inaccurate ADC conversion in differential mode with 200x gain.

1. Inaccurate ADC conversion in differential mode with 200x gain

With AVCC < 3.6V, random conversions will be inaccurate. Typical absolute accuracymay

reach 64 LSB.

Problem Fix/Workaround

None

8.2 Rev. B

Not sampled

8.3 Rev. A

•EEPROM read from application code does not work in Lock Bit Mode 3.

1. EEPROM read from application code does not work in Lock Bit Mode 3

When the Memory Lock Bits LB2 and LB1 are programmed to mode 3, EEPROM read does

not work from the ap plication code.

Problem Fix/Work around

Do not set Lock Bit Protection Mode 3 when the application code needs to read from

EEPROM.

2593MS–AVR–08/07

ATmega644

9. Datasheet Revision History

Please note that the referring page numbers in this section are referred to this document. The

referring re visio n in th is section are referring to the document revision.

9.1 Rev. 2593M - 08/07

9.2 Rev. 2593L - 02/07

9.3 Rev. 2593K - 01/07

9.4 Rev. 2593J - 09/06

1. Updated ”Features” on page 1.

2. Updated description in ”Stack Pointer” on page 13.

3. Updated ”Power-on Reset” on page 46.

4. Updated ”Brown-out Detection” on page 47.

5. Updated ”Internal Voltage Reference” on page 48.

6. Updated code example in ”MCUCR – MCU Control Register” on page 58.

7. Added ”System and Reset Characteristics” on page 320.

8. All Register Descriptions moved to the end of their respective chapters.

1. Updated bit description on page 153

2. Updated typos in “External Interrupts” Section 11.1.6 on pag e 63

3. UpdatedTable 24-8 on page 280

4. Updated Table 24-7 on page 280.

1 Removed the “Not recommended in new designs“ notice on page 1.

2. Updated Figure 2-1 on page 3.

3. Updated ”PCIFR – Pin Change Interrupt Flag Register” on page 62.

4. Updated Table 21-4 on page 248.

5. Added note to ”DC Characteristics” on page 316.

1. Updated ”Calibrated Internal RC Oscillator” on page 33.

2. Updated ”Fast PWM Mode” on page 117.

3. Updated ”Device Identification Register” on page 260.

4. Updated ”Signature Bytes” on page 287.

5. Updated Table 13-3 on page 97,Table 13- 6 on page 98, Table 14-3 on page 126, Table

14-4 on page 126, Table 14-5 on page 127, Table 15-3 on page 146, Table 15-6 on

page 147 and Table 15-8 on page 148.

20 2593MS–AVR–08/07

ATmega644

9.5 Rev. 2593I - 08/06

9.6 Rev. 2593H - 07/06

9.7 Rev. 2593G - 06/06

9.8 Rev. 2593F - 04/06

9.9 Rev. 2593E - 04/06

9.10 Rev. 2593D - 04/06

9.11 Rev. 2593C - 03/06

1. Updated note in ”Pin Configurations” on page 2.

2. Updated Table 7-2 on page 29, Table 12-11 on page 80 and Table 24-7 on page 280.

3. Updated ”Timer/Counter Prescaler” on page 145.

1. Updated ”Fast PWM Mode” on page 117.

2. Updated Figure 14-7 on page 118.

3. Updated Table 24-7 on page 280.

4. Updated ”Packaging Information” on page 362.

1. Updated ”Calibrated Internal RC Oscillator” on page 33.

2. Updated ”OSCCAL – Oscillator Calibration Register” on page 37.

3. Updated Table 26-1 on page 319.

1. Updated typos.

2. Updated ”ADC Noise Reduction Mode” on page 40.

3. Updated ”Power-down Mode” on page 40.

1. Updated ”Calibrated Internal RC Oscillator” on page 33.

1. Updated ”Bit 6 – ACBG: Analog Comparator Bandgap Select” on page 231.

2. Updated ”Prescaling and Conversion Timing” on page 236.

1. Added “Not recommende d in new designs”.

2. Removed RAMPZ– Extended Z-pointer Register for ELPM/SPM from datasheet.

3. Updated Table 10-1 on page 55.

2593MS–AVR–08/07

ATmega644

9.12 Rev. 2593B - 03/06

9.13 Rev. 2593A-06/05

1. Initial revision.

4. Updated code example in ”Interrupt Vectors in ATmega644” on page 55.

5. Updated ”Setting the Boot Loader Lock Bits by SPM” on page 276.

6. Updated ”Register Summary” on page 354.

1. Removed the occurancy of ATmega164 and ATmega324.

2. Updated Adresses in Registers.

3. Updated ”Architectural Overview” on page 9.

4. Updated SRAM sizes in ”SRAM Data Memo ry” on pa ge 18.

5. Updated ”I/O Memory” on page 20.

6. Updated ”PRR – Power Reduction Register” on page 44.

7. Updated Register bi t Discription in ”Register Description” on page 146.

8. Updated Note in ”Overview of the TWI Module” on page 206.

9. Updated Feauters in ”Analog-to-digital Converter” on page 233.

10. Changed name from “SFIOR“ to “ADCSRB“ in ”Starting a Conversion” on page 235, in

”Bit 5 – ADATE: ADC Auto Trigger Enable” on page 250 and ”Bit 7, 5:3 – Res:

Reserved Bits” on page 251.

11. Updated ”Signature Bytes” on page 287.

12. Updated ”DC Characteristics” on page 316.

13. Updated ”Typical Characteristics” on page 326 .

14. Updated Example in ”Supply Current of IO modules” on page 331.

15. Updated ”Register Summary” on page 354.

16. Updated Figure 6-2 on page 18 and Figure 21-1 on page 234.

17. Updated ”E rr at a” on page 365.

18. Updated Table 9-1 on page 47, Table 9-4 on page 51,Ta ble 10-1 on pag e 55,Ta ble 23-

1 on page 260, Table 25-7 on page 287, Table 25-15 on page 299,Table 26-6 on page

322, Table 27-1 on page 331, Table 27-2 on page 332.

2593MS–AVR–08/07

Headquarters International

Atmel Corporation

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USA

Tel: 1(408) 441-0311

Fax: 1(408) 487-2600

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France

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Fax: (33) 1-30-60-71-11

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Japan

Tel: (81) 3-3523-3551

Fax: (81) 3-3523-7581

Product Contact

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www.atmel.com/contacts

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