36 Register Summary
| Offset | Name | Bit Pos. | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|
0x00 ... 0x22 | Reserved | |||||||||
| 0x23 | PINB | 7:0 | PINB7 | PINB6 | PINB5 | PINB4 | PINB3 | PINB2 | PINB1 | PINB0 |
| 0x24 | DDRB | 7:0 | DDRB7 | DDRB6 | DDRB5 | DDRB4 | DDRB3 | DDRB2 | DDRB1 | DDRB0 |
| 0x25 | PORTB | 7:0 | PORTB7 | PORTB6 | PORTB5 | PORTB4 | PORTB3 | PORTB2 | PORTB1 | PORTB0 |
| 0x26 | PINC | 7:0 | PINC6 | PINC5 | PINC4 | PINC3 | PINC2 | PINC1 | PINC0 | |
| 0x27 | DDRC | 7:0 | DDRC6 | DDRC5 | DDRC4 | DDRC3 | DDRC2 | DDRC1 | DDRC0 | |
| 0x28 | PORTC | 7:0 | PORTC6 | PORTC5 | PORTC4 | PORTC3 | PORTC2 | PORTC1 | PORTC0 | |
| 0x29 | PIND | 7:0 | PIND7 | PIND6 | PIND5 | PIND4 | PIND3 | PIND2 | PIND1 | PIND0 |
| 0x2A | DDRD | 7:0 | DDRD7 | DDRD6 | DDRD5 | DDRD4 | DDRD3 | DDRD2 | DDRD1 | DDRD0 |
| 0x2B | PORTD | 7:0 | PORTD7 | PORTD6 | PORTD5 | PORTD4 | PORTD3 | PORTD2 | PORTD1 | PORTD0 |
| 0x2C | PINE | 7:0 | PINE3 | PINE2 | PINE1 | PINE0 | ||||
| 0x2D | DDRE | 7:0 | DDRE3 | DDRE2 | DDRE1 | DDRE0 | ||||
| 0x2E | PORTE | 7:0 | PORTE3 | PORTE2 | PORTE1 | PORTE0 | ||||
0x2F ... 0x34 | Reserved | |||||||||
| 0x35 | TIFR0 | 7:0 | OCF0B | OCF0A | TOV0 | |||||
| 0x36 | TIFR1 | 7:0 | ICF1 | OCF1B | OCF1A | TOV1 | ||||
| 0x37 | TIFR2 | 7:0 | OCF2B | OCF2A | TOV2 | |||||
0x38 ... 0x3A | Reserved | |||||||||
| 0x3B | PCIFR | 7:0 | PCIF2 | PCIF1 | PCIF0 | |||||
| 0x3C | EIFR | 7:0 | INTF1 | INTF0 | ||||||
| 0x3D | EIMSK | 7:0 | INT1 | INT0 | ||||||
| 0x3E | GPIOR0 | 7:0 | GPIOR0[7:0] | |||||||
| 0x3F | EECR | 7:0 | EEPM[1:0] | EERIE | EEMPE | EEPE | EERE | |||
| 0x40 | EEDR | 7:0 | EEDR[7:0] | |||||||
| 0x41 | EEARL and EEARH | 7:0 | EEAR[7:0] | |||||||
| 15:8 | EEAR[9:8] | |||||||||
| 0x43 | GTCCR | 7:0 | TSM | PSRASY | PSRSYNC | |||||
| 0x44 | TCCR0A | 7:0 | COM0A [1:0] | COM0B [1:0] | WGM0 1 | WGM0 0 | ||||
| 0x45 | TCCR0B | 7:0 | FOC0A | FOC0B | WGM0 [2] | CS0[2:0] | ||||
| 0x46 | TCNT0 | 7:0 | TCNT0[7:0] | |||||||
| 0x47 | OCR0A | 7:0 | OCR0A[7:0] | |||||||
| 0x48 | OCR0B | 7:0 | OCR0B[7:0] | |||||||
0x49 | Reserved | |||||||||
| 0x4A | GPIOR1 | 7:0 | GPIOR1[7:0] | |||||||
| 0x4B | GPIOR2 | 7:0 | GPIOR2[7:0] | |||||||
| 0x4C | SPCR | 7:0 | SPIE | SPE | DORD | MSTR | CPOL | CPHA | SPR0 [1:0] | |
| 0x4D | SPSR | 7:0 | SPIF | WCOL | SPI2X | |||||
| 0x4E | SPDR | 7:0 | SPID[7:0] | |||||||
| 0x4F | ACSR0 | 7:0 | ACOE | |||||||
| 0x50 | ACSR | 7:0 | ACD | ACBG | ACO | ACI | ACIE | ACIC | ACIS [1:0] | |
| 0x51 | DWDR | 7:0 | DWDR[7:0] | |||||||
0x52 | Reserved | |||||||||
| 0x53 | SMCR | 7:0 | SM[2:0] | SE | ||||||
| 0x54 | MCUSR | 7:0 | WDRT | BORF | EXTRF | PORF | ||||
| 0x55 | MCUCR | 7:0 | BODS | BODSE | PUD | IVSEL | IVCE | |||
0x56 | Reserved | |||||||||
| 0x57 | SPMCSR | 7:0 | SPMIE | RWWSB | SIGRD | RWWSRE | BLBSET | PGWRT | PGERS | SPMEN |
| 0x57 | SPMCSR | 7:0 | SPMIE | RWWSB | SIGRD | RWWSRE | BLBSET | PGWRT | PGERS | SPMEN |
0x58 ... 0x5C | Reserved | |||||||||
| 0x5D | SPL and SPH | 7:0 | SP[7:0] | |||||||
| 15:8 | SP[15:8] | |||||||||
| 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 | CLKPS [3:0] | ||||||
0x62 ... 0x63 | Reserved | |||||||||
| 0x64 | PRR | 7:0 | PRTWI | PRTIM2 | PRTIM0 | PRTIM1 | PRSPI | PRUSART | PRADC | |
0x65 | Reserved | |||||||||
| 0x66 | OSCCAL | 7:0 | CAL [7:0] | |||||||
0x67 | Reserved | |||||||||
| 0x68 | PCICR | 7:0 | PCIE2 | PCIE1 | PCIE0 | |||||
| 0x69 | EICRA | 7:0 | ISC1 [1:0] | ISC0 [1:0] | ||||||
0x6A | Reserved | |||||||||
| 0x6B | PCMSK0 | 7:0 | PCINT 7 | PCINT 6 | PCINT 5 | PCINT 4 | PCINT 3 | PCINT 2 | PCINT 1 | PCINT 0 |
| 0x6C | PCMSK1 | 7:0 | PCINT14 | PCINT13 | PCINT12 | PCINT11 | PCINT10 | PCINT9 | PCINT8 | |
| 0x6D | PCMSK2 | 7:0 | PCINT23 | PCINT22 | PCINT21 | PCINT20 | PCINT19 | PCINT18 | PCINT17 | PCINT16 |
| 0x6E | TIMSK0 | 7:0 | OCIE0B | OCIE0A | TOIE0 | |||||
| 0x6F | TIMSK1 | 7:0 | ICIE1 | OCIE1B | OCIE1A | TOIE1 | ||||
| 0x70 | TIMSK2 | 7:0 | OCIE2B | OCIE2A | TOIE2 | |||||
0x71 ... 0x77 | Reserved | |||||||||
| 0x78 | ADCL and ADCH | 7:0 | ADC[7:0] | |||||||
| 15:8 | ADC[9:8] | |||||||||
| 0x78 | ADCL and ADCH | 7:0 | ADC[1:0] | |||||||
| 15:8 | ADC[9:2] | |||||||||
| 0x7A | ADCSRA | 7:0 | ADEN | ADSC | ADATE | ADIF | ADIE | ADPS [2:0] | ||
| 0x7B | ADCSRB | 7:0 | ACME | ADTS [2:0] | ||||||
| 0x7C | ADMUX | 7:0 | REFS [1:0] | ADLAR | MUX [3:0] | |||||
0x7D | Reserved | |||||||||
| 0x7E | DIDR0 | 7:0 | ADC7D | ADC6D | ADC5D | ADC4D | ADC3D | ADC2D | ADC1D | ADC0D |
| 0x7F | DIDR1 | 7:0 | AIN1D | AIN0D | ||||||
| 0x80 | TCCR1A | 7:0 | COM1A[1:0] | COM1B[1:0] | WGM1[1:0] | |||||
| 0x81 | TCCR1B | 7:0 | ICNC1 | ICES1 | WGM1[3] | WGM1[2] | CS1[2:0] | |||
| 0x82 | TCCR1C | 7:0 | FOC1A | FOC1B | ||||||
0x83 | Reserved | |||||||||
| 0x84 | TCNT1L and TCNT1H | 7:0 | TCNT1[7:0] | |||||||
| 15:8 | TCNT1[15:8] | |||||||||
| 0x86 | ICR1L and ICR1H | 7:0 | ICR1[7:0] | |||||||
| 15:8 | ICR1[15:8] | |||||||||
| 0x88 | OCR1AL and OCR1AH | 7:0 | OCR1A[7:0] | |||||||
| 15:8 | OCR1A[15:8] | |||||||||
| 0x8A | OCR1BL and OCR1BH | 7:0 | OCR1B[7:0] | |||||||
| 15:8 | OCR1B[15:8] | |||||||||
0x8C ... 0xAF | Reserved | |||||||||
| 0xB0 | TCCR2A | 7:0 | COM2A [1:0] | COM2B [1:0] | WGM2 [1:0] | |||||
| 0xB1 | TCCR2B | 7:0 | FOC2A | FOC2B | WGM2 [2] | CS2[2:0] | ||||
| 0xB2 | TCNT2 | 7:0 | TCNT2[7:0] | |||||||
| 0xB3 | OCR2A | 7:0 | OCR2A[7:0] | |||||||
| 0xB4 | OCR2B | 7:0 | OCR2B[7:0] | |||||||
0xB5 | Reserved | |||||||||
| 0xB6 | ASSR | 7:0 | EXCLK | AS2 | TCN2UB | OCR2AUB | OCR2BUB | TCR2AUB | TCR2BUB | |
0xB7 | Reserved | |||||||||
| 0xB8 | TWBR | 7:0 | TWBR [7:0] | |||||||
| 0xB9 | TWSR | 7:0 | TWS7 | TWS6 | TWS5 | TWS4 | TWS3 | TWPS[1:0] | ||
| 0xBA | TWAR | 7:0 | TWA[6:0] | TWGCE | ||||||
| 0xBB | TWDR | 7:0 | TWD[7:0] | |||||||
| 0xBC | TWCR | 7:0 | TWINT | TWEA | TWSTA | TWSTO | TWWC | TWEN | TWIE | |
| 0xBD | TWAMR | 7:0 | TWAM[6:0] | |||||||
0xBE ... 0xBF | Reserved | |||||||||
| 0xC0 | UCSR0A | 7:0 | RXC0 | TXC0 | UDRE0 | FE0 | DOR0 | UPE0 | U2X0 | MPCM0 |
| 0xC1 | UCSR0B | 7:0 | RXCIE0 | TXCIE0 | UDRIE0 | RXEN0 | TXEN0 | UCSZ02 | RXB80 | TXB80 |
| 0xC2 | UCSR0C | 7:0 | UMSEL0 [1:0] | UPM0 [1:0] | USBS0 | UCSZ01 / UDORD0 | UCSZ00 / UCPHA0 | UCPOL0 | ||
| 0xC3 | UCSR0D | 7:0 | RXIE | RXS | SFDE | |||||
| 0xC4 | UBRR0L and UBRR0H | 7:0 | UBRR0[7:0] | |||||||
| 15:8 | UBRR0[11:8] | |||||||||
| 0xC6 | UDR0 | 7:0 | TXB / RXB[7:0] | |||||||