| 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) |
GICR |
INT1 |
INT0 |
– |
– |
– |
– |
IVSEL |
IVCE |
| 0x3A
(0x5A) |
GIFR |
INTF1 |
INTF0 |
– |
– |
– |
– |
– |
– |
| 0x39
(0x59) |
TIMSK |
OCIE2 |
TOIE2 |
TICIE1 |
OCIE1A |
OCIE1B |
TOIE1 |
– |
TOIE0 |
| 0x38
(0x58) |
TIFR |
OCF2 |
TOV2 |
ICF1 |
OCF1A |
OCF1B |
TOV1 |
– |
TOV0 |
| 0x37
(0x57) |
SPMCR |
SPMIE |
RWWSB |
– |
RWWSRE |
BLBSET |
PGWRT |
PGERS |
SPMEN |
| 0x36
(0x56) |
TWCR |
TWINT |
TWEA |
TWSTA |
TWSTO |
TWWC |
TWEN |
– |
TWIE |
| 0x35
(0x55) |
MCUCR |
SE |
SM2 |
SM1 |
SM0 |
ISC11 |
ISC10 |
ISC01 |
ISC00 |
| 0x34
(0x54) |
MCUCSR |
– |
– |
– |
– |
WDRF |
BORF |
EXTRF |
PORF |
| 0x33
(0x53) |
TCCR0 |
– |
– |
– |
– |
– |
CS02 |
CS01 |
CS00 |
| 0x32
(0x52) |
TCNT0 |
Timer/Counter0 (8 Bits) |
| 0x31
(0x51) |
OSCCAL |
Oscillator Calibration Register |
| 0x30
(0x50) |
SFIOR |
– |
– |
– |
– |
ACME |
PUD |
PSR2 |
PSR10 |
| 0x2F
(0x4F) |
TCCR1A |
COM1A1 |
COM1A0 |
COM1B1 |
COM1B0 |
FOC1A |
FOC1B |
WGM11 |
WGM10 |
| 0x2E
(0x4E) |
TCCR1B |
ICNC1 |
ICES1 |
– |
WGM13 |
WGM12 |
CS12 |
CS11 |
CS10 |
| 0x2D
(0x4D) |
TCNT1H |
Timer/Counter1 – Counter Register High byte |
| 0x2C
(0x4C) |
TCNT1L |
Timer/Counter1 – Counter Register Low byte |
| 0x2B
(0x4B) |
OCR1AH |
Timer/Counter1 – Output Compare Register A High
byte |
| 0x2A
(0x4A) |
OCR1AL |
Timer/Counter1 – Output Compare Register A Low
byte |
| 0x29
(0x49) |
OCR1BH |
Timer/Counter1 – Output Compare Register B High
byte |
| 0x28
(0x48) |
OCR1BL |
Timer/Counter1 – Output Compare Register B Low
byte |
| 0x27
(0x47) |
ICR1H |
Timer/Counter1 – Input Capture Register High byte |
| 0x26
(0x46) |
ICR1L |
Timer/Counter1 – Input Capture Register Low byte |
| 0x25
(0x45) |
TCCR2 |
FOC2 |
WGM20 |
COM21 |
COM20 |
WGM21 |
CS22 |
CS21 |
CS20 |
| 0x24
(0x44) |
TCNT2 |
Timer/Counter2 (8 Bits) |
| 0x23
(0x43) |
OCR2 |
Timer/Counter2 Output Compare Register |
| 0x22
(0x42) |
ASSR |
– |
– |
– |
– |
AS2 |
TCN2UB |
OCR2UB |
TCR2UB |
| 0x21
(0x41) |
WDTCR |
– |
– |
– |
WDCE |
WDE |
WDP2 |
WDP1 |
WDP0 |
| 0x20(1) (0x40)(1) |
UBRRH |
URSEL |
– |
– |
– |
UBRR[11:8] |
| UCSRC |
URSEL |
UMSEL |
UPM1 |
UPM0 |
USBS |
UCSZ1 |
UCSZ0 |
UCPOL |
| 0x1F
(0x3F) |
EEARH |
– |
– |
– |
– |
– |
– |
– |
EEAR8 |
| 0x1E
(0x3E) |
EEARL |
EEAR7 |
EEAR6 |
EEAR5 |
EEAR4 |
EEAR3 |
EEAR2 |
EEAR1 |
EEAR0 |
| 0x1D
(0x3D) |
EEDR |
EEPROM Data Register |
| 0x1C
(0x3C) |
EECR |
– |
– |
– |
– |
EERIE |
EEMWE |
EEWE |
EERE |
| 0x1B
(0x3B) |
Reserved |
|
| 0x1A
(0x3A) |
Reserved |
| 0x19
(0x39) |
Reserved |
| 0x18
(0x38) |
PORTB |
PORTB7 |
PORTB6 |
PORTB5 |
PORTB4 |
PORTB3 |
PORTB2 |
PORTB1 |
PORTB0 |
| 0x17
(0x37) |
DDRB |
DDB7 |
DDB6 |
DDB5 |
DDB4 |
DDB3 |
DDB2 |
DDB1 |
DDB0 |
| 0x16
(0x36) |
PINB |
PINB7 |
PINB6 |
PINB5 |
PINB4 |
PINB3 |
PINB2 |
PINB1 |
PINB0 |
| 0x15
(0x35) |
PORTC |
– |
PORTC6 |
PORTC5 |
PORTC4 |
PORTC3 |
PORTC2 |
PORTC1 |
PORTC0 |
| 0x14
(0x34) |
DDRC |
– |
DDC6 |
DDC5 |
DDC4 |
DDC3 |
DDC2 |
DDC1 |
DDC0 |
| 0x13
(0x33) |
PINC |
– |
PINC6 |
PINC5 |
PINC4 |
PINC3 |
PINC2 |
PINC1 |
PINC0 |
| 0x12
(0x32) |
PORTD |
PORTD7 |
PORTD6 |
PORTD5 |
PORTD4 |
PORTD3 |
PORTD2 |
PORTD1 |
PORTD0 |
| 0x11
(0x31) |
DDRD |
DDD7 |
DDD6 |
DDD5 |
DDD4 |
DDD3 |
DDD2 |
DDD1 |
DDD0 |
| 0x10
(0x30) |
PIND |
PIND7 |
PIND6 |
PIND5 |
PIND4 |
PIND3 |
PIND2 |
PIND1 |
PIND0 |
| 0x0F
(0x2F) |
SPDR |
SPI Data Register |
| 0x0E
(0x2E) |
SPSR |
SPIF |
WCOL |
– |
– |
– |
– |
– |
SPI2X |
| 0x0D
(0x2D) |
SPCR |
SPIE |
SPE |
DORD |
MSTR |
CPOL |
CPHA |
SPR1 |
SPR0 |
| 0x0C
(0x2C) |
UDR |
USART I/O Data Register |
| 0x0B
(0x2B) |
UCSRA |
RXC |
TXC |
UDRE |
FE |
DOR |
PE |
U2X |
MPCM |
| 0x0A
(0x2A) |
UCSRB |
RXCIE |
TXCIE |
UDRIE |
RXEN |
TXEN |
UCSZ2 |
RXB8 |
TXB8 |
| 0x09
(0x29) |
UBRRL |
USART Baud Rate Register Low byte |
| 0x08
(0x28) |
ACSR |
ACD |
ACBG |
ACO |
ACI |
ACIE |
ACIC |
ACIS1 |
ACIS0 |
| 0x07
(0x27) |
ADMUX |
REFS1 |
REFS0 |
ADLAR |
– |
MUX3 |
MUX2 |
MUX1 |
MUX0 |
| 0x06
(0x26) |
ADCSRA |
ADEN |
ADSC |
ADFR |
ADIF |
ADIE |
ADPS2 |
ADPS1 |
ADPS0 |
| 0x05
(0x25) |
ADCH |
ADC Data Register High byte |
| 0x04
(0x24) |
ADCL |
ADC Data Register Low byte |
| 0x03
(0x23) |
TWDR |
Two-wire Serial Interface Data Register |
| 0x02
(0x22) |
TWAR |
TWA6 |
TWA5 |
TWA4 |
TWA3 |
TWA2 |
TWA1 |
TWA0 |
TWGCE |
| 0x01
(0x21) |
TWSR |
TWS7 |
TWS6 |
TWS5 |
TWS4 |
TWS3 |
– |
TWPS1 |
TWPS0 |
| 0x00
(0x20) |
TWBR |
Two-wire Serial Interface Bit Rate Register |