ATmega3250 register table (also ATmega325, 645, 6450.)
Walking along the table below fills the bits of a
Register
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
/
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
/
0
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
0
1
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
1
2
PINA
DDRA
PORTA
PINB
DDRB
PORTB
PINC
DDRC
PORTC
PIND
DDRD
PORTD
PINE
DDRE
PORTE
PINF
2
3
DDRF
PORTF
PING
DDRG
PORTG
TIFR0
TIFR1
TIFR2
EIFR
EIMSK
GPIOR0
EECR
3
4
EEDR
EEAR
EEARL
EEARH
GTCCR
TCCR0A
TCNT0
OCR0A
GPIOR1
GPIOR2
SPCR
SPSR
SPDR
4
5
ACSR
OCDR
SMCR
MCUSR
MCUCR
SPMCSR
5
6
WDTCR
CLKPR
PRR
OSCCAL
EICRA
PCMSK0
PCMSK1
PCMSK2
TIMSK0
TIMSK1
6
7
TIMSK2
PCMSK3
ADC
ADCW
ADCL
ADCH
ADCSRA
ADCSRB
ADMUX
DIDR0
DIDR1
7
8
TCCR1A
TCCR1B
TCCR1C
TCNT1
TCNT1L
TCNT1H
ICR1
ICR1L
ICR1H
OCR1A
OCR1AL
OCR1AH
OCR1B
OCR1BL
OCR1BH
8
9
9
A
A
B
TCCR2A
TCNT2
OCR2A
ASSR
USICR
USISR
USIDR
B
C
UCSR0A
UCSR0B
UCSR0C
UBRR0
UBRR0L
UBRR0H
UDR0
C
D
PINH
DDRH
PORTH
PINJ
DDRJ
PORTJ
D
E
E
F
F
/
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
/
.