Address
(0x79)
(0x78)
(0x77)
(0x76)
(0x75)
(0x74)
(0x73)
(0x72)
(0x71)
(0x70)
(0x6F)
(0x6E)
(0x6D)
(0x6C)
(0x6B)
(0x6A)
(0x69)
(0x68)
(0x67)
(0x66)
(0x65)
(0x64)
(0x63)
(0x62)
(0x61)
(0x60)
0x3F (0x5F)
0x3E (0x5E)
0x3D (0x5D)
0x3C (0x5C)
0x3B (0x5B)
0x3A (0x5A)
0x39 (0x59)
0x38 (0x58)
0x37 (0x57)
0x36 (0x56)
0x35 (0x55)
0x34 (0x54)
0x33 (0x53)
0x32 (0x52)
0x31 (0x51)
0x30 (0x50)
0x2F (0x4F)
0x2E (0x4E)
0x2D (0x4D)
0x2C (0x4C)
0x2B (0x4B)
0x2A (0x4A)
0x29 (0x49)
0x28 (0x48)
0x27 (0x47)
0x26 (0x46)
0x25 (0x45)
0x24 (0x44)
0x23 (0x43)
0x22 (0x42)
0x21 (0x41)
0x20 (0x40)
0x1F (0x3F)
0x1E (0x3E)
0x1D (0x3D)
0x1C (0x3C)
0x1B (0x3B)
0x1A (0x3A)
0x19 (0x39)
0x18 (0x38)
0x17 (0x37)
0x16 (0x36)
Name
ADCH
ADCL
Reserved
Reserved
Reserved
Reserved
PCMSK3
Reserved
Reserved
Reserved
TIMSK1
TIMSK0
PCMSK2
PCMSK1
PCMSK0
Reserved
EICRA
PCICR
OSCCAL1
OSCCAL0
Reserved
PRR
Reserved
Reserved
CLKPR
WDTCSR
SREG
SPH
SPL
Reserved
Reserved
Reserved
Reserved
Reserved
SPMCSR
CCP
MCUCR
MCUSR
SMCR
Reserved
DWDR
ACSRA
ACSRB
SPDR
SPSR
SPCR
GPIOR2
GPIOR1
Reserved
OCR0B
OCR0A
TCNT0
TCCR0B
TCCR0A
GTCCR
Reserved
EEARL
EEDR
EECR
GPIOR0
EIMSK
EIFR
PCIFR
Reserved
Reserved
Reserved
Reserved
TIFR1
Bit 7
–
–
–
–
–
–
–
–
–
–
PCINT23
PCINT15
PCINT7
–
–
–
–
CAL07
–
PRTWI
–
–
–
WDIF
I
–
SP7
–
–
–
–
–
SPMIE
–
–
–
–
ACD
HSEL
SPIF
SPIE
FOC0A
COM0A1
TSM
–
–
–
–
–
–
–
–
–
Bit 6
–
–
–
–
–
–
–
–
–
–
PCINT22
PCINT14
PCINT6
–
–
–
–
CAL06
–
–
–
–
–
WDIE
T
–
SP6
–
–
–
–
–
RWWSB
–
–
–
–
ACPMUX2
HLEV
WCOL
SPE
FOC0B
COM0A0
–
–
–
–
–
–
–
–
–
–
Bit 5
Bit 4
Bit 3
Bit 2
ADC – Conversion Result High Byte
ADC – Conversion Result Low Byte
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
PCINT27
PCINT26
–
–
–
–
–
–
–
–
–
–
–
–
ICIE1
–
–
OCIE1B
–
–
–
OCIE0B
PCINT21
PCINT20
PCINT19
PCINT18
PCINT13
PCINT12
PCINT11
PCINT10
PCINT5
PCINT4
PCINT3
PCINT2
–
–
–
–
–
–
ISC11
ISC10
–
–
PCIE3
PCIE2
–
–
–
–
CAL05
CAL04
CAL03
CAL02
–
–
–
–
PRTIM0
–
PRTIM1
PRSPI
–
–
–
–
–
–
–
–
–
–
CLKPS3
CLKPS2
WDP3
–
WDE
WDP2
H
S
V
N
–
–
–
–
SP5
SP4
SP3
SP2
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
RSIG
RWWSRE
RWFLB
PGWRT
CPU Change Protection Register
–
–
–
–
–
–
WDRF
BORF
–
–
–
SM1
–
–
–
–
debugWire Data Register
ACO
ACI
ACIE
ACIC
ACLP
ACNMUX1 ACNMUX0
SPI Data Register
–
–
–
–
DORD
MSTR
CPOL
CPHA
General Purpose I/O Register 2
General Purpose I/O Register 1
Bit 1
–
–
–
–
PCINT25
–
–
–
OCIE1A
OCIE0A
PCINT17
PCINT9
PCINT1
–
ISC01
PCIE1
CAL11
CAL01
–
PRUSART0
–
–
CLKPS1
WDP1
Z
SP9
SP1
–
–
–
–
–
PGERS
IVSEL
EXTRF
SM0
–
ACIS1
ACPMUX1
–
SPR1
Bit 0
–
–
–
–
PCINT24
–
–
–
TOIE1
TOIE0
PCINT16
PCINT8
PCINT0
–
ISC00
PCIE0
CAL10
CAL00
–
PRADC
–
–
CLKPS0
WDP0
C
SP8
SP0
–
–
–
–
–
SPMEN
–
PORF
SE
–
ACIS0
ACPMUX0
SPI2X
SPR0
Timer/Counter0 – Output Compare Register B
Timer/Counter0 – Output Compare Register A
Timer/Counter0 – Counter Register
–
–
WGM02
CS02
COM0B1
COM0B0
–
–
–
–
–
–
CS01
WGM01
–
CS00
WGM00
PSR
EEPROM Address Register Low Byte
EEPROM Data Register
EEPM1
EEPM0
EERIE
EEMPE
General Purpose I/O register 0
–
–
–
–
–
–
–
–
–
–
PCIF3
PCIF2
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
ICF1
–
–
OCF1B
EEPE
INT1
INT1
PCIF1
–
–
–
–
OCF1A
EERE
INT0
INTF0
PCIF0
–
–
–
–
TOV1
Page(s)
Page 151
Page 151
Page 54
Page 129
Page 102
Page 54
Page 54
Page 55
Page 55
Page 56
Page 33
Page 32
Page 37
Page 31
Page 46
Page 15
Page 14
Page 14
Page 223
Page 14
Page 53
Page 45
Page 37
Page 213
Page 134
Page 135
Page 163
Page 162
Page 161
Page 25
Page 25
Page 102
Page 102
Page 101
Page 100
Page 97
Page 132
Page 23
Page 24
Page 24
Page 26
Page 56
Page 57
Page 57
Page 130
ATtiny828 [DATASHEET] 10
8371AS–AVR–08/12