Datasheet

10
2593OS–AVR–02/12
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 SP14 SP13 SP12 SP11 SP10 SP9 SP8 11
0x3D (0x5D) SPL SP7 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 BLBSET 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 Register 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) SPSR SPIF WCOL - - - - - SPI2X 162
0x2C (0x4C) SPCR 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 Byte 21
0x20 (0x40) EEDR EEPROM Data Register 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