34 Register Summary

OffsetNameBit Pos.76543210

0x00

...

0x1F

Reserved         
0x20PINA7:0PINA7PINA6PINA5PINA4PINA3PINA2PINA1PINA0
0x21DDRA7:0DDRA7DDRA6DDRA5DDRA4DDRA3DDRA2DDRA1DDRA0
0x22PORTA7:0PORTA7PORTA6PORTA5PORTA4PORTA3PORTA2PORTA1PORTA0
0x23PINB7:0PINB7PINB6PINB5PINB4PINB3PINB2PINB1PINB0
0x24DDRB7:0DDRB7DDRB6DDRB5DDRB4DDRB3DDRB2DDRB1DDRB0
0x25PORTB7:0PORTB7PORTB6PORTB5PORTB4PORTB3PORTB2PORTB1PORTB0
0x26PINC7:0PINC7PINC6PINC5PINC4PINC3PINC2PINC1PINC0
0x27DDRC7:0DDRC7DDRC6DDRC5DDRC4DDRC3DDRC2DDRC1DDRC0
0x28PORTC7:0PORTC7PORTC6PORTC5PORTC4PORTC3PORTC2PORTC1PORTC0
0x29PIND7:0PIND7PIND6PIND5PIND4PIND3PIND2PIND1PIND0
0x2ADDRD7:0DDRD7DDRD6DDRD5DDRD4DDRD3DDRD2DDRD1DDRD0
0x2BPORTD7:0PORTD7PORTD6PORTD5PORTD4PORTD3PORTD2PORTD1PORTD0
0x2CPINE7:0 PINE6PINE5PINE4PINE3PINE2PINE1PINE0
0x2DDDRE7:0 DDRE6DDRE5DDRE4DDRE3DDRE2DDRE1DDRE0
0x2EPORTE7:0 PORTE6PORTE5PORTE4PORTE3PORTE2PORTE1PORTE0

0x2F

...

0x34

Reserved         
0x35TIFR07:0     OCF0BOCF0ATOV0
0x36TIFR17:0  ICF1  OCF1BOCF1ATOV1
0x37TIFR27:0     OCF2BOCF2ATOV2
0x38TIFR37:0  ICF3  OCF3BOCF3ATOV3
0x39TIFR47:0  ICF4  OCF4BOCF4ATOV4

0x3A

Reserved         
0x3BPCIFR7:0   PCIF4PCIF3PCIF2PCIF1PCIF0
0x3CEIFR7:0     INTF2INTF1INTF0
0x3DEIMSK7:0     INT2INT1INT0
0x3EGPIOR07:0GPIOR0[7:0]
0x3FEECR7:0  EEPM[1:0]EERIEEEMPEEEPEEERE
0x40EEDR7:0EEDR[7:0]
0x41EEARL and EEARH7:0EEAR[7:0]
15:8    EEAR[11:8]
0x43GTCCR7:0TSM     PSRASYPSRSYNC
0x44TCCR0A7:0COM0A[1:0]COM0B [1:0]  WGM0[1:0]
0x45TCCR0B7:0FOC0AFOC0B  WGM0 [2]CS0[2:0]
0x46TCNT07:0TCNT0[7:0]
0x47OCR0A7:0OCR0A[7:0]
0x48OCR0B7:0OCR0B[7:0]

0x49

Reserved         
0x4AGPIOR17:0GPIOR1[7:0]
0x4BGPIOR27:0GPIOR2[7:0]
0x4CSPCR07:0SPIE0SPE0DORD0MSTR0CPOL0CPHA0SPR0 [1:0]
0x4DSPSR07:0SPIF0WCOL0     SPI2X0
0x4ESPDR07:0SPID[7:0]
0x4FACSRB7:0       ACOE
0x50ACSR7:0ACDACBGACOACIACIEACICACIS [1:0]
0x51OCDR7:0IDRD/OCDR7OCDR 6OCDR 5OCDR 4OCDR 3OCDR 2OCDR 1OCDR 0

0x52

Reserved         
0x53SMCR7:0    SM[2:0]SE
0x54MCUSR 7:0   JTRFWDRFBORFEXTRFPORF
0x55MCUCR7:0JTDBODSBODSEPUD  IVSELIVCE

0x56

Reserved         
0x57SPMCSR7:0SPMIERWWSBSIGRDRWWSREBLBSETPGWRTPGERSSPMEN

0x58

...

0x5C

Reserved         
0x5DSPL and SPH7:0SP[7:0]
15:8SP[11:8]
0x5FSREG7:0ITHSVNZC
0x60WDTCSR7:0WDIFWDIEWDP[3]WDCEWDEWDP[2:0]
0x61CLKPR7:0CLKPCE   CLKPS [3:0]
0x62XFDCSR7:0      XFDIFXFDIE
0x63PRR27:0    PRPTCPRUSART2PRSPI1PRTWI1
0x64PRR07:0PRTWI0PRTIM2PRTIM0PRUSART1PRTIM1PRSPI0PRUSART0PRADC
0x65PRR17:0      PRTIM4PRTIM3
0x66OSCCAL7:0CAL [7:0]

0x67

Reserved         
0x68PCICR7:0   PCIE4PCIE3PCIE2PCIE1PCIE0
0x69EICRA7:0  ISC2 [1:0]ISC1 [1:0]ISC0 [1:0]

0x6A

Reserved         
0x6BPCMSK07:0PCINT 7PCINT 6PCINT 5PCINT 4PCINT 3PCINT 2PCINT 1PCINT 0
0x6CPCMSK17:0PCINT15PCINT14PCINT13PCINT12PCINT11PCINT10PCINT9PCINT8
0x6DPCMSK27:0PCINT23PCINT22PCINT21PCINT20PCINT19PCINT18PCINT17PCINT16
0x6ETIMSK07:0     OCIE0BOCIE0ATOIE0
0x6FTIMSK17:0  ICIE1  OCIE1BOCIE1ATOIE1
0x70TIMSK27:0     OCIE2BOCIE2ATOIE2
0x71TIMSK37:0  ICIE3  OCIE3BOCIE3ATOIE3
0x72TIMSK47:0  ICIE4  OCIE4BOCIE4ATOIE4
0x73PCMSK37:0PCINT31PCINT30PCINT29PCINT28PCINT27PCINT26PCINT25PCINT24
0x74PCMSK47:0 PCINT38PCINT37PCINT36PCINT35PCINT34PCINT33PCINT32

0x75

...

0x77

Reserved         
0x78ADCL and ADCH7:0ADC[7:0]
15:8      ADC[9:8]
0x78ADCL and ADCH7:0ADC[1:0]      
15:8ADC[9:2]
0x7AADCSRA7:0ADENADSCADATEADIFADIEADPS [2:0]
0x7BADCSRB7:0 ACME   ADTS [2:0]
0x7CADMUX7:0REFS [1:0]ADLARMUX [4:0]

0x7D

Reserved         
0x7EDIDR07:0ADC7DADC6DADC5DADC4DADC3DADC2DADC1DADC0D
0x7FDIDR17:0AIN1DAIN0D
0x80TCCR1A7:0COM1A[1:0]COM1B[1:0]  WGM1[1:0]
0x81TCCR1B7:0ICNC1ICES1 WGM1[3]WGM1[2]CS1[2:0]
0x82TCCR1C7:0FOC1AFOC1B      

0x83

Reserved         
0x84TCNT1L and TCNT1H7:0TCNT1[7:0]
15:8TCNT1[15:8]
0x86ICR1L and ICR1H7:0ICR1[7:0]
15:8ICR1[15:8]
0x88OCR1AL and OCR1AH7:0OCR1A[7:0]
15:8OCR1A[15:8]
0x8AOCR1BL and OCR1BH7:0OCR1B[7:0]
15:8OCR1B[15:8]

0x8C

...

0x8F

Reserved         
0x90TCCR3A7:0COM3A[1:0]COM3B[1:0]  WGM3[1:0]
0x91TCCR3B7:0ICNC3ICES3 WGM3[3]WGM3[2]CS3[2:0]
0x92TCCR3C7:0FOC3AFOC3B      

0x93

Reserved         
0x94TCNT3L and TCNT3H7:0TCNT3[7:0]
15:8TCNT3[15:8]
0x96ICR3L and ICR3H7:0ICR3[7:0]
15:8ICR3[15:8]
0x98OCR3AL and OCR3AH7:0OCR3A[7:0]
15:8OCR3A[15:8]
0x9AOCR3BL and OCR3BH7:0OCR3B[7:0]
15:8OCR3B[15:8]

0x9C

...

0x9F

Reserved         
0xA0TCCR4A7:0COM4A[1:0]COM4B[1:0]  WGM4[1:0]
0xA1TCCR4B7:0ICNC4ICES4 WGM4[3]WGM4[2]CS4[2:0]
0xA2TCCR4C7:0FOC4AFOC4B      

0xA3

Reserved         
0xA4TCNT4L and TCNT4H7:0TCNT4[7:0]
15:8TCNT4[15:8]
0xA6ICR4L and ICR4H7:0ICR4[7:0]
15:8ICR4[15:8]
0xA8OCR4AL and OCR4AH7:0OCR4A[7:0]
15:8OCR4A[15:8]
0xAAOCR4BL and OCR4BH7:0OCR4B[7:0]
15:8OCR4B[15:8]
0xACSPCR17:0SPIE1SPE1DORD1MSTR1CPOL1CPHA1SPR1 [1:0]
0xADSPSR17:0SPIF1WCOL1     SPI2X1
0xAESPDR17:0SPID1[7:0]

0xAF

Reserved         
0xB0TCCR2A7:0COM2A [1:0]COM2B [1:0]  WGM2 [1:0]
0xB1TCCR2B7:0FOC2AFOC2B   WGM2 [2]CS2[2:0]
0xB2TCNT27:0TCNT2[7:0]
0xB3OCR2A7:0OCR2A[7:0]
0xB4OCR2B7:0OCR2B[7:0]

0xB5

Reserved         
0xB6ASSR7:0 EXCLKAS2TCN2UBOCR2AUBOCR2BUBTCR2AUBTCR2BUB

0xB7

Reserved         
0xB8TWBR07:0TWBR [7:0]
0xB9TWSR07:0TWS7TWS6TWS5TWS4TWS3 TWPS[1:0]
0xBATWAR07:0TWA[6:0]TWGCE
0xBBTWDR07:0TWD[7:0]
0xBCTWCR07:0TWINTTWEATWSTATWSTOTWWCTWEN TWIE
0xBDTWAMR07:0TWAM[6:0] 

0xBE

...

0xBF

Reserved         
0xC0UCSR0A7:0RXCTXCUDREFEDORUPEU2XMPCM
0xC1UCSR0B7:0RXCIETXCIEUDRIERXENTXENUCSZ2RXB8TXB8
0xC2UCSR0C7:0UMSEL[1:0]UPM[1:0]USBSUCSZ1 / UDORDUCSZ0 / UCPHAUCPOL
0xC3UCSR0D7:0RXSIERXSSFDE     
0xC4UBRR0L and UBRR0H7:0UBRR[7:0]
15:8    UBRR[11:8]
0xC6UDR07:0TXB / RXB[7:0]

0xC7

Reserved         
0xC8UCSR1A7:0RXCTXCUDREFEDORUPEU2XMPCM
0xC9UCSR1B7:0RXCIETXCIEUDRIERXENTXENUCSZ2RXB8TXB8
0xCAUCSR1C7:0UMSEL[1:0]UPM[1:0]USBSUCSZ1 / UDORDUCSZ0 / UCPHAUCPOL
0xCBUCSR1D7:0RXSIERXSSFDE     
0xCCUBRR1L and UBRR1H7:0UBRR[7:0]
15:8    UBRR[11:8]
0xCEUDR17:0TXB / RXB[7:0]

0xCF

Reserved         
0xD0UCSR2A7:0RXCTXCUDREFEDORUPEU2XMPCM
0xD1UCSR2B7:0RXCIETXCIEUDRIERXENTXENUCSZ2RXB8TXB8
0xD2UCSR2C7:0UMSEL[1:0]UPM[1:0]USBSUCSZ1 / UDORDUCSZ0 / UCPHAUCPOL
0xD3UCSR2D7:0RXSIERXSSFDE     
0xD4UBRR2L and UBRR2H7:0UBRR[7:0]
15:8    UBRR[11:8]
0xD6UDR27:0TXB / RXB[7:0]

0xD7

Reserved         
0xD8TWBR17:0TWBR [7:0]
0xD9TWSR17:0TWS7TWS6TWS5TWS4TWS3 TWPS[1:0]
0xDATWAR17:0TWA[6:0]TWGCE
0xDBTWDR17:0TWD[7:0]
0xDCTWCR17:0TWINTTWEATWSTATWSTOTWWCTWEN TWIE
0xDDTWAMR17:0TWAM[6:0]