363
2467S–AVR–07/09
ATmega128
($61) DDRF DDF7 DDF6 DDF5 DDF4 DDF3 DDF2 DDF1 DDF0 89
($60) Reserved – – – – – – – –
$3F ($5F) SREG I T H S V N Z C 11
$3E ($5E) SPH SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 14
$3D ($5D) SPL SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 14
$3C ($5C) XDIV XDIVEN XDIV6 XDIV5 XDIV4 XDIV3 XDIV2 XDIV1 XDIV0 37
$3B ($5B) RAMPZ – – – – – – – RAMPZ0 14
$3A ($5A) EICRB ISC71 ISC70 ISC61 ISC60 ISC51 ISC50 ISC41 ISC40 91
$39 ($59) EIMSK INT7 INT6 INT5 INT4 INT3 INT2 INT1 INT0 92
$38 ($58) EIFR INTF7 INTF6 INTF5 INTF4 INTF3 INTF INTF1 INTF0 92
$37 ($57) TIMSK OCIE2 TOIE2 TICIE1 OCIE1A OCIE1B TOIE1 OCIE0 TOIE0 109, 139, 159
$36 ($56) TIFR OCF2 TOV2 ICF1 OCF1A OCF1B TOV1 OCF0 TOV0 109, 141, 160
$35 ($55) MCUCR SRE SRW10 SE SM1 SM0 SM2 IVSEL IVCE 31, 45, 64
$34 ($54) MCUCSR JTD – – JTRF WDRF BORF EXTRF PORF 54, 254
$33 ($53) TCCR0 FOC0 WGM00 COM01 COM00 WGM01 CS02 CS01 CS00 104
$32 ($52) TCNT0 Timer/Counter0 (8 Bit) 106
$31 ($51) OCR0 Timer/Counter0 Output Compare Register 106
$30 ($50) ASSR – – – – AS0 TCN0UB OCR0UB TCR0UB 107
$2F ($4F) TCCR1A COM1A1 COM1A0 COM1B1 COM1B0 COM1C1 COM1C0 WGM11 WGM10 133
$2E ($4E) TCCR1B ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 136
$2D ($4D) TCNT1H Timer/Counter1 – Counter Register High Byte 138
$2C ($4C) TCNT1L Timer/Counter1 – Counter Register Low Byte 138
$2B ($4B) OCR1AH Timer/Counter1 – Output Compare Register A High Byte 138
$2A ($4A) OCR1AL Timer/Counter1 – Output Compare Register A Low Byte 138
$29 ($49) OCR1BH Timer/Counter1 – Output Compare Register B High Byte 138
$28 ($48) OCR1BL Timer/Counter1 – Output Compare Register B Low Byte 138
$27 ($47) ICR1H Timer/Counter1 – Input Capture Register High Byte 139
$26 ($46) ICR1L Timer/Counter1 – Input Capture Register Low Byte 139
$25 ($45) TCCR2 FOC2 WGM20 COM21 COM20 WGM21 CS22 CS21 CS20 157
$24 ($44) TCNT2 Timer/Counter2 (8 Bit) 159
$23 ($43) OCR2 Timer/Counter2 Output Compare Register 159
$22 ($42) OCDR
IDRD/OCDR7
OCDR6 OCDR5 OCDR4 OCDR3 OCDR2 OCDR1 OCDR0 251
$21 ($41) WDTCR – – – WDCE WDE WDP2 WDP1 WDP0 56
$20 ($40) SFIOR TSM – – – ACME PUD PSR0 PSR321 73, 110, 145, 227
$1F ($3F) EEARH – – – – EEPROM Address Register High 21
$1E ($3E) EEARL EEPROM Address Register Low Byte 21
$1D ($3D) EEDR EEPROM Data Register 22
$1C ($3C) EECR – – – – EERIE EEMWE EEWE EERE 22
$1B ($3B) PORTA PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 87
$1A ($3A) DDRA DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 87
$19 ($39) PINA PINA7 PINA6 PINA5 PINA4 PINA3 PINA2 PINA1 PINA0 87
$18 ($38) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 87
$17 ($37) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 87
$16 ($36) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 87
$15 ($35) PORTC PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 87
$14 ($34) DDRC DDC7 DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 87
$13 ($33) PINC PINC7 PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 88
$12 ($32) PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 88
$11 ($31) DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 88
$10 ($30) PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 88
$0F ($2F) SPDR SPI Data Register 169
$0E ($2E) SPSR SPIF WCOL
– – – – – SPI2X 169
$0D ($2D) SPCR SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 167
$0C ($2C) UDR0 USART0 I/O Data Register 189
$0B ($2B) UCSR0A RXC0 TXC0 UDRE0 FE0 DOR0 UPE0 U2X0 MPCM0 189
$0A ($2A) UCSR0B RXCIE0 TXCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80 190
$09 ($29) UBRR0L USART0 Baud Rate Register Low 192
$08 ($28) ACSR ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 227
$07 ($27) ADMUX REFS1 REFS0 ADLAR MUX4 MUX3 MUX2 MUX1 MUX0 242
$06 ($26) ADCSRA ADEN ADSC ADFR ADIF ADIE ADPS2 ADPS1 ADPS0 244
$05 ($25) ADCH ADC Data Register High Byte 245
$04 ($24) ADCL ADC Data Register Low byte 245
$03 ($23) PORTE PORTE7 PORTE6 PORTE5 PORTE4 PORTE3 PORTE2 PORTE1 PORTE0 88
$02 ($22) DDRE DDE7 DDE6 DDE5 DDE4 DDE3 DDE2 DDE1 DDE0 88
Register Summary (Continued)
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
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