200
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
23. Register Summary
Note:
1. For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addresses
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Page
0x3F
SREG
I
T
H
S
V
N
Z
C
0x3E
SPH
–
SP9
SP8
0x3D
SPL
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
0x3C
Reserved
–
0x3B
GIMSK
–
INT0
PCIE
–
0x3A
GIFR
–
INTF0
PCIF
–
0x39
TIMSK
–
OCIE1A
OCIE1B
OCIE0A
OCIE0B
TOIE1
TOIE0
–
0x38
TIFR
–
OCF1A
OCF1B
OCF0A
OCF0B
TOV1
TOV0
–
0x37
SPMCSR
–
RSIG
CTPB
RFLB
PGWRT
PGERS
SPMEN
0x36
Reserved
–
0x35
MCUCR
BODS
PUD
SE
SM1
SM0
BODSE
ISC01
ISC00
0x34
MCUSR
–
WDRF
BORF
EXTRF
PORF
0x33
TCCR0B
FOC0A
FOC0B
–
WGM02
CS02
CS01
CS00
0x32
TCNT0
Timer/Counter0
0x31
OSCCAL
Oscillator Calibration Register
0x30
TCCR1
CTC1
PWM1A
COM1A1
COM1A0
CS13
CS12
CS11
CS10
0x2F
TCNT1
Timer/Counter1
0x2E
OCR1A
Timer/Counter1 Output Compare Register A
0x2D
OCR1C
Timer/Counter1 Output Compare Register C
0x2C
GTCCR
TSM
PWM1B
COM1B1
COM1B0
FOC1B
FOC1A
PSR1
PSR0
0x2B
OCR1B
Timer/Counter1 Output Compare Register B
0x2A
TCCR0A
COM0A1
COM0A0
COM0B1
COM0B0
–
WGM01
WGM00
0x29
OCR0A
Timer/Counter0 – Output Compare Register A
0x28
OCR0B
Timer/Counter0 – Output Compare Register B
0x27
PLLCSR
LSM
–
PCKE
PLLE
PLOCK
0x26
CLKPR
CLKPCE
–
CLKPS3
CLKPS2
CLKPS1
CLKPS0
0x25
DT1A
DT1AH3
DT1AH2
DT1AH1
DT1AH0
DT1AL3
DT1AL2
DT1AL1
DT1AL0
0x24
DT1B
DT1BH3
DT1BH2
DT1BH1
DT1BH0
DT1BL3
DT1BL2
DT1BL1
DT1BL0
0x23
DTPS1
-
DTPS11
DTPS10
0x22
DWDR
DWDR[7:0]
0x21
WDTCR
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
0x20
PRR
–
PRTIM1
PRTIM0
PRUSI
PRADC
0x1F
EEARH
EEAR8
0x1E
EEARL
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
0x1D
EEDR
EEPROM Data Register
0x1C
EECR
–
EEPM1
EEPM0
EERIE
EEMPE
EEPE
EERE
0x1B
Reserved
–
0x1A
Reserved
–
0x19
Reserved
–
0x18
PORTB
–
PORTB5
PORTB4
PORTB3
PORTB2
PORTB1
PORTB0
0x17
DDRB
–
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
0x16
PINB
–
PINB5
PINB4
PINB3
PINB2
PINB1
PINB0
0x15
PCMSK
–
PCINT5
PCINT4
PCINT3
PCINT2
PCINT1
PCINT0
0x14
DIDR0
–
ADC0D
ADC2D
ADC3D
ADC1D
AIN1D
AIN0D
0x13
GPIOR2
General Purpose I/O Register 2
0x12
GPIOR1
General Purpose I/O Register 1
0x11
GPIOR0
General Purpose I/O Register 0
0x10
USIBR
USI Buffer Register
0x0F
USIDR
USI Data Register
0x0E
USISR
USISIF
USIOIF
USIPF
USIDC
USICNT3
USICNT2
USICNT1
USICNT0
0x0D
USICR
USISIE
USIOIE
USIWM1
USIWM0
USICS1
USICS0
USICLK
USITC
0x0C
Reserved
–
0x0B
Reserved
–
0x0A
Reserved
–
0x09
Reserved
–
0x08
ACSR
ACD
ACBG
ACO
ACI
ACIE
–
ACIS1
ACIS0
0x07
ADMUX
REFS1
REFS0
ADLAR
REFS2
MUX3
MUX2
MUX1
MUX0
0x06
ADCSRA
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
0x05
ADCH
ADC Data Register High Byte
0x04
ADCL
ADC Data Register Low Byte
0x03
ADCSRB
BIN
ACME
IPR
–
ADTS2
ADTS1
ADTS0
0x02
Reserved
–
0x01
Reserved
–
0x00
Reserved
–