Datasheet

Offset Name Bit Pos.
0x52 Reserved
0x53 SMCR 7:0 SM2 SM1 SM0 SE
0x54 MCUSR 7:0 JTRF WDRF BORF EXTRF PORF
0x55 MCUCR 7:0 JTD PUD IVSEL IVCE
0x56 Reserved
0x57 SPMCSR 7:0 SPMIE RWWSB SIGRD RWWSRE BLBSET PGWRT PGERS SPMEN
0x58
...
0x5A
Reserved
0x5B RAMPZ 7:0 RAMPZ7 RAMPZ6 RAMPZ5 RAMPZ4 RAMPZ3 RAMPZ2 RAMPZ1 RAMPZ0
0x5C Reserved
0x5D
SPL and SPH
7:0 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
0x5E 15:8 SP12 SP11 SP10 SP9 SP8
0x5F SREG 7:0 I T H S V N Z C
0x60 WDTCSR 7:0 WDIF WDIE WDP[3] WDCE WDE WDP[2:0]
0x61 CLKPR 7:0 CLKPCE CLKPS3 CLKPS2 CLKPS1 CLKPS0
0x62
...
0x63
Reserved
0x64 PRR0 7:0 PRTWI PRTIM2 PRTIM0 PRUSART1 PRTIM1 PRSPI0 PRUSART0 PRADC
0x65 Reserved
0x66 OSCCAL 7:0 CAL7 CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0
0x67 Reserved
0x68 PCICR 7:0 PCIE3 PCIE2 PCIE1 PCIE0
0x69 EICRA 7:0 ISC21 ISC20 ISC11 ISC10 ISC01 ISC00
0x6A Reserved
0x6B PCMSK0 7:0 PCINT7 PCINT6 PCINT5 PCINT4 PCINT3 PCINT2 PCINT1 PCINT0
0x6C PCMSK1 7:0 PCINT15 PCINT14 PCINT13 PCINT12 PCINT11 PCINT10 PCINT9 PCINT8
0x6D PCMSK2 7:0 PCINT23 PCINT22 PCINT21 PCINT20 PCINT19 PCINT18 PCINT17 PCINT16
0x6E TIMSK0 7:0 OCIEB OCIEA TOIE
0x6F TIMSK1 7:0 ICIE OCIEB OCIEA TOIE
0x70 TIMSK2 7:0 OCIEB OCIEA TOIE
0x71
...
0x72
Reserved
0x73 PCMSK3 7:0 PCINT31 PCINT30 PCINT29 PCINT28 PCINT27 PCINT26 PCINT25 PCINT24
0x74
...
0x77
Reserved
0x78
ADCL and ADCH
7:0 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADC1 ADC0
0x79 15:8 ADC9 ADC8
0x7A ADCSRA 7:0 ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0
0x7B ADCSRB 7:0 ACME ADTS2 ADTS1 ADTS0
0x7C ADMUX 7:0 REFS1 REFS0 ADLAR MUX4 MUX3 MUX2 MUX1 MUX0
0x7D Reserved
0x7E DIDR0 7:0 ADC7D ADC6D ADC5D ADC4D ADC3D ADC2D ADC1D ADC0D
0x7F DIDR1 7:0 Reserved5 Reserved4 Reserved3 Reserved2 Reserved1 Reserved0 AIN1D AIN0D
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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