223
2588F–AVR–06/2013
ATtiny261/461/861
21. Register Summary
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Page
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)
GIMSK
INT1
INT0
PCIE1
PCIE0
–
0x3A (0x5A)
GIFR
INTF1
INTF0
PCIF
–
0x39 (0x59)
TIMSK
OCIE1D
OCIE1A
OCIE1B
OCIE0A
OCIE0B
TOIE1
TOIE0
TICIE0
0x38 (0x58)
TIFR
OCF1D
OCF1A
OCF1B
OCF0A
OCF0B
TOV1
TOV0
ICF0
0x37 (0x57)
SPMCSR
–
CTPB
RFLB
PGWRT
PGERS
SPMEN
0x36 (0x56)
PRR
PRTIM1
PRTIM0
PRUSI
PRADC
0x35 (0x55)
MCUCR
–PUD
SE
SM1
SM0
–ISC01
ISC00
0x34 (0x54)
MCUSR
–
WDRF
BORF
EXTRF
PORF
0x33 (0x53)
TCCR0B
–
TSM
PSR0
CS02
CS01
CS00
0x32 (0x52)
TCNT0L
Timer/Counter0 Counter Register Low Byte
0x31 (0x51)
OSCCAL
Oscillator Calibration Register
0x30 (0x50)
TCCR1A
COM1A1
COM1A0
COM1B1
COM1B0
FOC1A
FOC1B
PWM1A
PWM1B
0x2F (0x4F)
TCCR1B
PWM1X
PSR1
DTPS11
DTPS10
CS13
CS12
CS11
CS10
0x2E (0x4E)
TCNT1
Timer/Counter1 Counter Register
0x2D (0x4D)
OCR1A
Timer/Counter1 Output Compare Register A
0x2C (0x4C)
OCR1B
Timer/Counter1 Output Compare Register B
0x2B (0x4B)
OCR1C
Timer/Counter1 Output Compare Register C
0x2A (0x4A)
OCR1D
Timer/Counter1 Output Compare Register D
0x29 (0x49)
PLLCSR
LSM
PCKE
PLLE
PLOCK
0x28 (0x48)
CLKPR
CLKPCE
CLKPS3
CLKPS2
CLKPS1
CLKPS0
0x27 (0x47)
TCCR1C
COM1A1S
COM1A0S
COM1B1S
COM1B0S
COM1D1
COM1D0
FOC1D
PWM1D
0x26 (0x46)
TCCR1D
FPIE1
FPEN1
FPNC1
FPES1
FPAC1
FPF1
WGM11
WGM10
0x25 (0x45)
TC1H
TC19
TC18
0x24 (0x44)
DT1
DT1H3
DT1H2
DT1H1
DT1H0
DT1L3
DT1L2
DT1L1
DT1L0
0x23 (0x43)
PCMSK0
PCINT7
PCINT6
PCINT5
PCINT4
PCINT3
PCINT2
PCINT1
PCINT0
0x22 (0x42)
PCMSK1
PCINT15
PCINT14
PCINT13
PCINT12
PCINT11
PCINT10
PCINT9
PCINT8
0x21 (0x41)
WDTCR
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
0x20 (0x40)
DWDR
DWDR[7:0]
0x1F (0x3F)
EEARH
EEAR8
0x1E (0x3E)
EEARL
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
0x1D (0x3D)
EEDR
EEPROM Data Register
0x1C (0x3C)
EECR
–
EEPM1
EEPM0
EERIE
EEMPE
EEPE
EERE
0x1B (0x3B)
PORTA
PORTA7
PORTA6
PORTA5
PORTA4
PORTA3
PORTA2
PORTA1
PORTA0
0x1A (0x3A)
DDRA
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
0x19 (0x39)
PINA
PINA7
PINA6
PINA5
PINA4
PINA3
PINA2
PINA1
PINA0
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)
TCCR0A
TCW0
ICEN0
ICNC0
ICES0
ACIC0
CTC0
0x14 (0x34)
TCNT0H
Timer/Counter0 Counter Register High Byte
0x13 (0x33)
OCR0A
Timer/Counter0 Output Compare Register A
0x12 (0x32)
OCR0B
Timer/Counter0 Output Compare Register B
0x11 (0x31)
USIPP
USIPOS
0x10 (0x30)
USIBR
USI Buffer Register
0x0F (0x2F)
USIDR
USI Data Register
0x0E (0x2E)
USISR
USISIF
USIOIF
USIPF
USIDC
USICNT3
USICNT2
USICNT1
USICNT0
0x0D (0x2D)
USICR
USISIE
USIOIE
USIWM1
USIWM0
USICS1
USICS0
USICLK
USITC
0x0C (0x2C)
GPIOR2
General Purpose I/O Register 2
0x0B (0x2B)
GPIOR1
General Purpose I/O Register 1
0x0A (0x2A)
GPIOR0
General Purpose I/O Register 0
0x09 (0x29)
ACSRB
HSEL
HLEV
ACM2
ACM1
ACM0
0x08 (0x28)
ACSRA
ACD
ACBG
ACO
ACI
ACIE
ACME
ACIS1
ACIS0
0x07 (0x27)
ADMUX
REFS1
REFS0
ADLAR
MUX4
MUX3
MUX2
MUX1
MUX0
0x06 (0x26)
ADCSRA
ADEN
ADSC
ADATE
ADIF
ADIE
ADPS2
ADPS1
ADPS0
0x05 (0x25)
ADCH
ADC Data Register High Byte
0x04 (0x24)
ADCL
ADC Data Register Low Byte
0x03 (0x23)
ADCSRB
BIN
GSEL
REFS2MUX5ADTS2
ADTS1
ADTS0
0x02 (0x22)
DIDR1
ADC10D
ADC9D
ADC8D
ADC7D
0x01 (0x21)
DIDR0
ADC6D
ADC5D
ADC4D
ADC3D
AREFD
ADC2D
ADC1D
ADC0D
0x00 (0x20)
TCCR1E
–
-
OC1OE5
OC1OE4
OC1OE3
OC1OE2
OC1OE1
OC1OE0