8
ATmega8(L)
2486RS–AVR–07/07
Register Summary
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
0x3F (0x5F) SREG I T H S V N Z C 11
0x3E (0x5E) SPH – – – – – SP10 SP9 SP8 13
0x3D (0x5D) SPL SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 13
0x3C (0x5C) Reserved
0x3B (0x5B) GICR INT1 INT0 – – – – IVSEL IVCE 49, 67
0x3A (0x5A) GIFR INTF1 INTF0 – – – – – –68
0x39 (0x59) TIMSK OCIE2 TOIE2 TICIE1 OCIE1A OCIE1B TOIE1 – TOIE0 72, 102, 122
0x38 (0x58) TIFR OCF2 TOV2 ICF1 OCF1A OCF1B TOV1 – TOV0 73, 103, 122
0x37 (0x57) SPMCR SPMIE RWWSB – RWWSRE BLBSET PGWRT PGERS SPMEN 213
0x36 (0x56) TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE 171
0x35 (0x55) MCUCR SE SM2 SM1 SM0 ISC11 ISC10 ISC01 ISC00 33, 66
0x34 (0x54) MCUCSR – – – – WDRF BORF EXTRF PORF 41
0x33 (0x53) TCCR0 – – – – – CS02 CS01 CS00 72
0x32 (0x52) TCNT0 Timer/Counter0 (8 Bits) 72
0x31 (0x51) OSCCAL Oscillator Calibration Register 31
0x30 (0x50) SFIOR
– – – – ACME PUD PSR2 PSR10 58, 75, 123, 193
0x2F (0x4F) TCCR1A COM1A1 COM1A0 COM1B1 COM1B0 FOC1A FOC1B WGM11 WGM10 97
0x2E (0x4E) TCCR1B ICNC1 ICES1
– WGM13 WGM12 CS12 CS11 CS10 100
0x2D (0x4D) TCNT1H Timer/Counter1 – Counter Register High byte 101
0x2C (0x4C) TCNT1L Timer/Counter1 – Counter Register Low byte 101
0x2B (0x4B) OCR1AH
Timer/Counter1 – Output Compare Register A High byte
101
0x2A (0x4A) OCR1AL
Timer/Counter1 – Output Compare Register A Low byte
101
0x29 (0x49) OCR1BH
Timer/Counter1 – Output Compare Register B High byte
101
0x28 (0x48) OCR1BL
Timer/Counter1 – Output Compare Register B Low byte
101
0x27 (0x47) ICR1H Timer/Counter1 – Input Capture Register High byte 102
0x26 (0x46) ICR1L Timer/Counter1 – Input Capture Register Low byte 102
0x25 (0x45) TCCR2 FOC2 WGM20 COM21 COM20 WGM21 CS22 CS21 CS20 117
0x24 (0x44) TCNT2 Timer/Counter2 (8 Bits) 119
0x23 (0x43) OCR2
Timer/Counter2 Output Compare Register
119
0x22 (0x42) ASSR – – – – AS2 TCN2UB OCR2UB TCR2UB 119
0x21 (0x41) WDTCR – – – WDCE WDE WDP2 WDP1 WDP0 43
0x20
(1)
(0x40)
(1)
UBRRH URSEL – – – UBRR[11:8] 158
UCSRC URSEL UMSEL UPM1 UPM0 USBS UCSZ1 UCSZ0 UCPOL 156
0x1F (0x3F) EEARH – – – – – – –EEAR8 20
0x1E (0x3E) EEARL EEAR7 EEAR6 EEAR5 EEAR4 EEAR3 EEAR2 EEAR1 EEAR0 20
0x1D (0x3D) EEDR EEPROM Data Register 20
0x1C (0x3C) EECR – – – – EERIE EEMWE EEWE EERE 20
0x1B (0x3B) Reserved
0x1A (0x3A) Reserved
0x19 (0x39) Reserved
0x18 (0x38) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 65
0x17 (0x37) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 65
0x16 (0x36) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 65
0x15 (0x35) PORTC – PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 65
0x14 (0x34) DDRC
– DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 65
0x13 (0x33) PINC – PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 65
0x12 (0x32) PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 65
0x11 (0x31) DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 65
0x10 (0x30) PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 65
0x0F (0x2F) SPDR SPI Data Register 131
0x0E (0x2E) SPSR SPIF WCOL – – – – – SPI2X 131
0x0D (0x2D) SPCR SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 129
0x0C (0x2C) UDR USART I/O Data Register 153
0x0B (0x2B) UCSRA RXC TXC UDRE FE DOR PE U2X MPCM 154
0x0A (0x2A) UCSRB RXCIE TXCIE UDRIE RXEN TXEN UCSZ2 RXB8 TXB8 155
0x09 (0x29) UBRRL USART Baud Rate Register Low byte 158
0x08 (0x28) ACSR ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 194
0x07 (0x27) ADMUX REFS1 REFS0 ADLAR – MUX3 MUX2 MUX1 MUX0 205
0x06 (0x26) ADCSRA ADEN ADSC ADFR ADIF ADIE ADPS2 ADPS1 ADPS0 207
0x05 (0x25) ADCH ADC Data Register High byte 208
0x04 (0x24) ADCL ADC Data Register Low byte 208
0x03 (0x23) TWDR Two-wire Serial Interface Data Register 173
0x02 (0x22) TWAR TWA6 TWA5 TWA4 TWA3 TWA2 TWA1 TWA0 TWGCE 174
