Register Summary

Offset Name Bit Pos.                

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]