Список регистров AT90S8535
| Address | Name | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
| $3F ($5F) | SREG | I | T | H | S | V | N | Z | C |
| $3E ($5E) | SPH | - | - | - | - | - | - | SP9 | SP8 |
| $3D ($5D) | SPL | SP7 | SP6 | SP5 | SP4 | SP3 | SP2 | SP1 | SP0 |
| $3C ($5C) | Reserved | ||||||||
| $3B ($5B) | GIMSK | INT1 | INT0 | - | - | - | - | - | - |
| $3A ($5A) | GIFR | INTF1 | INTF0 | - | - | - | - | - | - |
| $39 ($59) | TIMSK | OCIE2 | TOIE2 | TICIE1 | OCIE1A | OCIE1B | TOIE1 | - | TOIE0 |
| $38 ($58) | TIFR | OCF2 | TOV2 | ICF1 | OCF1A | OCF1B | TOV1 | - | TOV0 |
| $37 ($57) | Reserved | ||||||||
| $36 ($56) | Reserved | ||||||||
| $35 ($55) | MCUCR | - | SE | SM1 | SM0 | ISC11 | ISC10 | ISC01 | ISC00 |
| $34 ($54) | MCUSR | - | - | - | - | - | - | EXTRF | PORF |
| $33 ($53) | TCCR0 | - | - | - | - | - | CS02 | CS01 | CS00 |
| $32 ($52) | TCNT0 | Timer/Counter0 (8 Bits) | |||||||
| $31 ($51) | Reserved | ||||||||
| $30 ($50) | Reserved | ||||||||
| $2F ($4F) | TCCR1A | COM1A1 | COM1A0 | COM1B1 | COM1B0 | - | - | PWM11 | PWM10 |
| $2E ($4E) | TCCR1B | ICNC1 | ICES1 | - | - | CTC1 | CS12 | CS11 | CS10 |
| $2D ($4D) | TCNT1H | Timer/Counter1 - Counter Register High Byte | |||||||
| $2C ($4C) | TCNT1L | Timer/Counter1 - Counter Register Low Byte | |||||||
| $2B ($4B) | OCR1AH | Timer/Counter1 - Output Compare Register A High Byte | |||||||
| $2A ($4A) | OCR1AL | Timer/Counter1 - Output Compare Register A Low Byte | |||||||
| $29 ($49) | OCR1BH | Timer/Counter1 - Output Compare Register B High Byte | |||||||
| $28 ($48) | OCR1BL | Timer/Counter1 - Output Compare Register B Low Byte | |||||||
| $27 ($47) | ICR1H | Timer/Counter1 - Input Capture Register High Byte | |||||||
| $26 ($46) | ICR1L | Timer/Counter1 - Input Capture Register Low Byte | |||||||
| $25 ($45) | TCCR2 | - | PWM2 | COM21 | COM20 | CTC2 | CS22 | CS21 | CS20 |
| $24 ($44) | TCNT2 | Timer/Counter2 (8 Bits) | |||||||
| $23 ($43) | OCR2 | Timer/Counter2 Output Compare Register | |||||||
| $22 ($42) | ASSR | - | - | - | - | AS2 | TCN2UB | OCR2UB | TCR2UB |
| $21 ($41) | WDTCR | - | - | - | WDTOE | WDE | WDP2 | WDP1 | WDP0 |
| $20 ($40) | Reserved | ||||||||
| $1F ($3F) | EEARH | - | - | - | - | - | - | - | EEAR8 |
| $1E ($3E) | EEARL | EEAR7 | EEAR6 | EEAR5 | EEAR4 | EEAR3 | EEAR2 | EEAR1 | EEAR0 |
| $1D ($3D) | EEDR | EEPROM Data Register | |||||||
| $1C ($3C) | EECR | - | - | - | - | EERIE | EEMWE | EEWE | EERE |
| $1B ($3B) | PORTA | PORTA7 | PORTA6 | PORTA5 | PORTA4 | PORTA3 | PORTA2 | PORTA1 | PORTA0 |
| $1A ($3A) | DDRA | DDA7 | DDA6 | DDA5 | DDA4 | DDA3 | DDA2 | DDA1 | DDA0 |
| $19 ($39) | PINA | PINA7 | PINA6 | PINA5 | PINA4 | PINA3 | PINA2 | PINA1 | PINA0 |
| $18 ($38) | PORTB | PORTB7 | PORTB6 | PORTB5 | PORTB4 | PORTB3 | PORTB2 | PORTB1 | PORTB0 |
| $17 ($37) | DDRB | DDB7 | DDB6 | DDB5 | DDB4 | DDB3 | DDB2 | DDB1 | DDB0 |
| $16 ($36) | PINB | PINB7 | PINB6 | PINB5 | PINB4 | PINB3 | PINB2 | PINB1 | PINB0 |
| $15 ($35) | PORTC | PORTC7 | PORTC6 | PORTC5 | PORTC4 | PORTC3 | PORTC2 | PORTC1 | PORTC0 |
| $14 ($34) | DDRC | DDC7 | DDC6 | DDC5 | DDC4 | DDC3 | DDC2 | DDC1 | DDC0 |
| $13 ($33) | PINC | PINC7 | PINC6 | PINC5 | PINC4 | PINC3 | PINC2 | PINC1 | PINC0 |
| $12 ($32) | PORTD | PORTD7 | PORTD6 | PORTD5 | PORTD4 | PORTD3 | PORTD2 | PORTD1 | PORTD0 |
| $11 ($31) | DDRD | DDD7 | DDD6 | DDD5 | DDD4 | DDD3 | DDD2 | DDD1 | DDD0 |
| $10 ($30) | PIND | PIND7 | PIND6 | PIND5 | PIND4 | PIND3 | PIND2 | PIND1 | PIND0 |
| $0F ($2F) | SPDR | SPI Data Register | |||||||
| $0E ($2E) | SPSR | SPIF | WCOL | - | - | - | - | - | - |
| $0D ($2D) | SPCR | SPIE | SPE | DORD | MSTR | CPOL | CPHA | SPR1 | SPR0 |
| $0C ($2C) | UDR | UART I/O Data Register | |||||||
| $0B ($2B) | USR | RXC | TXC | UDRE | FE | OR | - | - | - |
| $0A ($2A) | UCR | RXCIE | TXCIE | UDRIE | RXEN | TXEN | CHR9 | RXB8 | TXB8 |
| $09 ($29) | UBRR | UART Baud Rate Register | |||||||
| $08 ($28) | ACSR | ACD | - | ACO | ACI | ACIE | ACIC | ACIS1 | ACIS0 |
| $07 ($27) | ADMUX | - | - | - | - | - | MUX2 | MUX1 | MUX0 |
| $06 ($26) | ADCSR | ADEN | ADSC | ADFR | ADIF | ADIE | ADPS2 | ADPS1 | ADPS0 |
| $05 ($25) | ADCH | - | - | - | - | - | - | ADC9 | ADC8 |
| $04 ($24) | ADCL | ADC7 | ADC6 | ADC5 | ADC4 | ADC3 | ADC2 | ADC1 | ADC0 |
| $03 ($23) | Reserved | ||||||||
| $02 ($22) | Reserved | ||||||||
| $01 ($21) | Reserved | ||||||||
| $00 ($20) | Reserved |
Примечания.
1. При записи в регшистры, у которых имеются неиспользованные резервированные биты, в эти биты необходимо записывать «0». В зарезервированные регистры запись не должна производиться.
2. Для очистки флагов, в регистры следует записывать «1». Использование инструкции SBI (выставить бит в регистре) приводит к сбросу этого флага. Инструкции CBI и SBI работают с регистрами с адресами от $00 до $1F.