ATtiny85 register table (also ATtiny25, ATtiny45.)
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
ADCSRB
ADC
ADCW
ADCL
ADCSRA
ADMUX
ACSR
USICR
USISR
USIDR
2
3
USIBR
GPIOR0
GPIOR1
GPIOR2
DIDR0
PCMSK
PINB
DDRB
PORTB
EECR
EEDR
EEAR
EEARL
EEARH
3
4
PRR
WDTCR
DWDR
DTPS1
DT1B
DT1A
CLKPR
PLLCSR
OCR0B
OCR0A
TCCR0A
OCR1B
GTCCR
OCR1C
OCR1A
TCNT1
4
5
TCCR1
OSCCAL
TCNT0
TCCR0B
MCUSR
MCUCR
SPMCSR
TIFR
TIMSK
GIFR
GIMSK
SPL
SPH
SREG
5
6
6
7
7
8
8
9
9
A
A
B
B
C
C
D
D
E
E
F
F
/
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
/
.