356
2593O–AVR–02/12
ATmega644
(0x7D)
Reserved
-
(0x7C)
ADMUX
REFS1
REFS0
ADLAR
MUX4
MUX3
MUX2
MUX1
MUX0
(0x7B)
ADCSRB
-ACME
-
ADTS2
ADTS1
ADTS0
(0x7A)
ADCSRA
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
(0x79)
ADCH
ADC Data Register High byte
(0x78)
ADCL
ADC Data Register Low byte
(0x77)
Reserved
-
(0x76)
Reserved
-
(0x75)
Reserved
-
(0x74)
Reserved
-
(0x73)
PCMSK3
PCINT31
PCINT30
PCINT29
PCINT28
PCINT27
PCINT26
PCINT25
PCINT24
(0x72)
Reserved
-
(0x71)
Reserved
-
(0x70)
TIMSK2
-
OCIE2B
OCIE2A
TOIE2
(0x6F)
TIMSK1
-
-ICIE1
-
OCIE1B
OCIE1A
TOIE1
(0x6E)
TIMSK0
-
OCIE0B
OCIE0A
TOIE0
(0x6D)
PCMSK2
PCINT23
PCINT22
PCINT21
PCINT20
PCINT19
PCINT18
PCINT17
PCINT16
(0x6C)
PCMSK1
PCINT15
PCINT14
PCINT13
PCINT12
PCINT11
PCINT10
PCINT9
PCINT8
(0x6B)
PCMSK0
PCINT7
PCINT6
PCINT5
PCINT4
PCINT3
PCINT2
PCINT1
PCINT0
(0x6A)
Reserved
-
(0x69)
EICRA
-
ISC21
ISC20
ISC11
ISC10
ISC01
ISC00
(0x68)
PCICR
-
PCIE3
PCIE2
PCIE1
PCIE0
(0x67)
Reserved
-
(0x66)
OSCCAL
Oscillator Calibration Register
(0x65)
Reserved
-
(0x64)
PRR
PRTWI
PRTIM2
PRTIM0
-
PRTIM1
PRSPI
PRUSART0
PRADC
(0x63)
Reserved
-
(0x62)
Reserved
-
(0x61)
CLKPR
CLKPCE
-
CLKPS3
CLKPS2
CLKPS1
CLKPS0
(0x60)
WDTCSR
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
0x3F (0x5F)
SREG
I
T
H
S
V
N
Z
C
0x3E (0x5E)
SPH
SP15
SP14
SP13
SP12
SP11
SP10
SP9
SP8
0x3D (0x5D)
SPL
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
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
0x36 (0x56)
Reserved
-
0x35 (0x55)
MCUCR
JTD
-
-PUD
-
IVSEL
IVCE
0x34 (0x54)
MCUSR
-
JTRF
WDRF
BORF
EXTRF
PORF
0x33 (0x53)
SMCR
-
SM2
SM1
SM0
SE
0x32 (0x52)
Reserved
-
0x31 (0x51)
OCDR
On-Chip Debug Register
0x30 (0x50)
ACSR
ACD
ACBG
ACO
ACI
ACIE
ACIC
ACIS1
ACIS0
0x2F (0x4F)
Reserved
-
0x2E (0x4E)
SPDR
SPI 0 Data Register
0x2D (0x4D)
SPSR
SPIF
WCOL
-
SPI2X
0x2C (0x4C)
SPCR
SPIE
SPE
DORD
MSTR
CPOL
CPHA
SPR1
SPR0
0x2B (0x4B)
GPIOR2
General Purpose I/O Register 2
0x2A (0x4A)
GPIOR1
General Purpose I/O Register 1
0x29 (0x49)
Reserved
-
0x28 (0x48)
OCR0B
Timer/Counter0 Output Compare Register B
0x27 (0x47)
OCR0A
Timer/Counter0 Output Compare Register A
0x26 (0x46)
TCNT0
Timer/Counter0 (8 Bit)
0x25 (0x45)
TCCR0B
FOC0A
FOC0B
-
WGM02
CS02
CS01
CS00
0x24 (0x44)
TCCR0A
COM0A1
COM0A0
COM0B1
COM0B0
-
WGM01
WGM00
0x23 (0x43)
GTCCR
TSM
-
PSRASY
PSRSYNC
0x22 (0x42)
EEARH
-
EEPROM Address Register High Byte
0x21 (0x41)
EEARL
EEPROM Address Register Low Byte
0x20 (0x40)
EEDR
EEPROM Data Register
0x1F (0x3F)
EECR
-
EEPM1
EEPM0
EERIE
EEMPE
EEPE
EERE
0x1E (0x3E)
GPIOR0
General Purpose I/O Register 0
0x1D (0x3D)
EIMSK
-
INT2
INT1
INT0
0x1C (0x3C)
EIFR
-
INTF2
INTF1
INTF0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
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