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IO registers of ATMEGA328P

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IO registers of ATMEGA328P

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0xFF-0xD0

Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
(0xFF) Reserved – – – – – – – –
(0xFE) Reserved – – – – – – – –
(0xFD) Reserved – – – – – – – –
(0xFC) Reserved – – – – – – – –
(0xFB) Reserved – – – – – – – –
(0xFA) Reserved – – – – – – – –
(0xF9) Reserved – – – – – – – –
(0xF8) Reserved – – – – – – – –
(0xF7) Reserved – – – – – – – –
(0xF6) Reserved – – – – – – – –
(0xF5) Reserved – – – – – – – –
(0xF4) Reserved – – – – – – – –
(0xF3) Reserved – – – – – – – –
(0xF2) Reserved – – – – – – – –
(0xF1) Reserved – – – – – – – –
(0xF0) Reserved – – – – – – – –
(0xEF) Reserved – – – – – – – –
(0xEE) Reserved – – – – – – – –
(0xED) Reserved – – – – – – – –
(0xEC) Reserved – – – – – – – –
(0xEB) Reserved – – – – – – – –
(0xEA) Reserved – – – – – – – –
(0xE9) Reserved – – – – – – – –
(0xE8) Reserved – – – – – – – –
(0xE7) Reserved – – – – – – – –
(0xE6) Reserved – – – – – – – –
(0xE5) Reserved – – – – – – – –
(0xE4) Reserved – – – – – – – –
(0xE3) Reserved – – – – – – – –
(0xE2) Reserved – – – – – – – –
(0xE1) Reserved – – – – – – – –
(0xE0) Reserved – – – – – – – –
(0xDF) Reserved – – – – – – – –
(0xDE) Reserved – – – – – – – –
(0xDD) Reserved – – – – – – – –
(0xDC) Reserved – – – – – – – –
(0xDB) Reserved – – – – – – – –
(0xDA) Reserved – – – – – – – –
(0xD9) Reserved – – – – – – – –
(0xD8) Reserved – – – – – – – –
(0xD7) Reserved – – – – – – – –
(0xD6) Reserved – – – – – – – –
(0xD5) Reserved – – – – – – – –
(0xD4) Reserved – – – – – – – –
(0xD3) Reserved – – – – – – – –
(0xD2) Reserved – – – – – – – –
(0xD1) Reserved – – – – – – – –
(0xD0) Reserved – – – – – – – –

0xCF-0x90

Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
(0xCF) Reserved – – – – – – – –
(0xCE) Reserved – – – – – – – –
(0xCD) Reserved – – – – – – – –
(0xCC) Reserved – – – – – – – –
(0xCB) Reserved – – – – – – – –
(0xCA) Reserved – – – – – – – –
(0xC9) Reserved – – – – – – – –
(0xC8) Reserved – – – – – – – –
(0xC7) Reserved – – – – – – – –
(0xC6) UDR0 USART I/O data register
(0xC5) UBRR0H USART baud rate register high
(0xC4) UBRR0L USART baud rate register low
(0xC3) Reserved – – – – – – – –
(0xC2) UCSR0C UMSEL01 UMSEL00 UPM01 UPM00 USBS0 UCSZ01/UDORD0 UCSZ00/UCPHA0 UCPOL0
(0xC1) UCSR0B RXCIE0 TXCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80
(0xC0) UCSR0A RXC0 TXC0 UDRE0 FE0 DOR0 UPE0 U2X0 MPCM0
(0xBF) Reserved – – – – – – – –
(0xBE) Reserved – – – – – – – –
(0xBD) TWAMR TWAM6 TWAM5 TWAM4 TWAM3 TWAM2 TWAM1 TWAM0 –
(0xBC) TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE
(0xBB) TWDR 2-wire serial interface data register
(0xBA) TWAR TWA6 TWA5 TWA4 TWA3 TWA2 TWA1 TWA0 TWGCE
(0xB9) TWSR TWS7 TWS6 TWS5 TWS4 TWS3 – TWPS1 TWPS0
(0xB8) TWBR 2-wire serial interface bit rate register
(0xB7) Reserved – – – – – – –
(0xB6) ASSR – EXCLK AS2 TCN2UB OCR2AUB OCR2BUB TCR2AUB TCR2BUB
(0xB5) Reserved – – – – – – – –
(0xB4) OCR2B Timer/Counter2 output compare register B
(0xB3) OCR2A Timer/Counter2 output compare register A
(0xB2) TCNT2 Timer/Counter2 (8-bit)
(0xB1) TCCR2B FOC2A FOC2B – – WGM22 CS22 CS21 CS20
(0xB0) TCCR2A COM2A1 COM2A0 COM2B1 COM2B0 – – WGM21 WGM20
(0xAF) Reserved – – – – – – – –
(0xAE) Reserved – – – – – – – –
(0xAD) Reserved – – – – – – – –
(0xAC) Reserved – – – – – – – –
(0xAB) Reserved – – – – – – – –
(0xAA) Reserved – – – – – – – –
(0xA9) Reserved – – – – – – – –
(0xA8) Reserved – – – – – – – –
(0xA7) Reserved – – – – – – – –
(0xA6) Reserved – – – – – – – –
(0xA5) Reserved – – – – – – – –
(0xA4) Reserved – – – – – – – –
(0xA3) Reserved – – – – – – – –
(0xA2) Reserved – – – – – – – –
(0xA1) Reserved – – – – – – – –
(0xA0) Reserved – – – – – – – –
(0x9F) Reserved – – – – – – – –
(0x9E) Reserved – – – – – – – –
(0x9D) Reserved – – – – – – – –
(0x9C) Reserved – – – – – – – –
(0x9B) Reserved – – – – – – – –
(0x9A) Reserved – – – – – – – –
(0x99) Reserved – – – – – – – –
(0x98) Reserved – – – – – – – –
(0x97) Reserved – – – – – – – –
(0x96) Reserved – – – – – – – –
(0x95) Reserved – – – – – – – –
(0x94) Reserved – – – – – – – –
(0x93) Reserved – – – – – – – –
(0x92) Reserved – – – – – – – –
(0x91) Reserved – – – – – – – –
(0x90) Reserved – – – – – – – –

0x8F-0x60

Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
(0x8F) Reserved – – – – – – – –
(0x8E) Reserved – – – – – – – –
(0x8D) Reserved – – – – – – – –
(0x8C) Reserved – – – – – – – –
(0x8B) OCR1BH Timer/Counter1 - Output compare register B high
(0x8A) OCR1BL Timer/Counter1 - Output compare register B low
(0x89) OCR1AH Timer/Counter1 - Output compare register A high
(0x88) OCR1AL Timer/Counter1 - Output compare register A low
(0x87) ICR1H Timer/Counter1 - Input capture register high
(0x86) ICR1L Timer/Counter1 - Input capture register low
(0x85) TCNT1H Timer/Counter1 - Counter register high
(0x84) TCNT1L Timer/Counter1 - Counter register low
(0x83) Reserved – – – – – – – –
(0x82) TCCR1C FOC1A FOC1B – – – – – –
(0x81) TCCR1B ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10
(0x80) TCCR1A COM1A1 COM1A0 COM1B1 COM1B0 – – WGM11 WGM10
(0x7F) DIDR1 – – – – – – AIN1D AIN0D
(0x7E) DIDR0 – – ADC5D ADC4D ADC3D ADC2D ADC1D ADC0D
(0x7D) Reserved – – – – – – – –
(0x7C) ADMUX REFS1 REFS0 ADLAR – 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) Reserved – – – – – – – –
(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 – PCINT14 PCINT13 PCINT12 PCINT11 PCINT10 PCINT9 PCINT8
(0x6B) PCMSK0 PCINT7 PCINT6 PCINT5 PCINT4 PCINT3 PCINT2 PCINT1 PCINT0
(0x6A) Reserved – – – – – – – –
(0x69) EICRA – – – – ISC11 ISC10 ISC01 ISC00
(0x68) PCICR – – – – – PCIE2 PCIE1 PCIE0
(0x67) Reserved – – – – – – – –
(0x66) OSCCAL Oscillator calibration register
(0x65) Reserved – – – – – – – –
(0x64) PRR PRTWI PRTIM2 PRTIM0 – PRTIM1 PRSPI PRUSAR0 PRADC
(0x63) Reserved – – – – – – – –
(0x62) Reserved – – – – – – – –
(0x61) CLKPR CLKPCE – – – CLKPS3 CLKPS2 CLKPS1 CLKPS0
(0x60) WDTCSR WDIF WDIE WDP3 WDCE WDE WDP2 WDP1 WDP0

0x5F-0x20

Address Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0x3F(0x5F) SREG I T H S V N Z C
0x3E(0x5E) SPH – – – – – (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) – (RWWSRE) BLBSET PGWRT PGERS SELFPRGN
0x36(0x56) Reserved – – – – – – – –
0x35(0x55) MCUCR – BODS BODSE PUD – – IVSEL IVCE
0x34(0x54) MCUSR – – – – WDRF BORF EXTRF PORF
0x33(0x53) SMCR – – – – SM2 SM1 SM0 SE
0x32(0x52) Reserved – – – – – – – –
0x31(0x51) Reserved – – – – – – – –
0x30(0x50) ACSR ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0
0x2F(0x4F) Reserved – – – – – – – –
0x2E(0x4E) SPDR SPI 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 – – – – – – INT1 INT0
0x1C(0x3C) EIFR – – – – – – INTF1 INTF0
0x1B(0x3B) PCIFR – – – – – PCIF2 PCIF1 PCIF0
0x1A(0x3A) Reserved – – – – – – – –
0x19(0x39) Reserved – – – – – – – –
0x18(0x38) Reserved – – – – – – – –
0x17(0x37) TIFR2 – – – – – OCF2B OCF2A TOV2
0x16(0x36) TIFR1 – – ICF1 – – OCF1B OCF1A TOV1
0x15(0x35) TIFR0 – – – – – OCF0B OCF0A TOV0
0x14(0x34) Reserved – – – – – – – –
0x13(0x33) Reserved – – – – – – – –
0x12(0x32) Reserved – – – – – – – –
0x11(0x31) Reserved – – – – – – – –
0x10(0x30) Reserved – – – – – – – –
0x0F(0x2F) Reserved – – – – – – – –
0x0E(0x2E) Reserved – – – – – – – –
0x0D(0x2D) Reserved – – – – – – – –
0x0C(0x2C) Reserved – – – – – – – –
0x0B(0x2B) PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0
0x0A(0x2A) DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0
0x09(0x29) PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0
0x08(0x28) PORTC – PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0
0x07(0x27) DDRC – DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0
0x06(0x26) PINC – PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0
0x05(0x25) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0
0x04(0x24) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0
0x03(0x23) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0
0x02(0x22) Reserved – – – – – – – –
0x01(0x21) Reserved – – – – – – – –
0x0(0x20) Reserved – – – – – – – –

https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf

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