ATmega8U2/16U2/32U2
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Page
(0x7C)
(0x7B)
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TIMSK1
TIMSK0
Reserved
PCMSK1
PCMSK0
EICRB
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
(0x7A)
-
-
-
-
-
-
-
-
(0x79)
-
-
-
-
-
-
-
-
(0x78)
-
-
-
-
-
-
-
-
(0x77)
-
-
-
-
-
-
-
-
(0x76)
-
-
-
-
-
-
-
-
(0x75)
-
-
-
-
-
-
-
-
(0x74)
-
-
-
-
-
-
-
-
(0x73)
-
-
-
-
-
-
-
-
(0x72)
-
-
-
-
-
-
-
-
-
-
(0x71)
-
-
-
-
-
-
(0x70)
-
-
-
-
-
-
OCIE1B
OCIE0B
-
-
-
(0x6F)
-
-
ICIE1
-
OCIE1C
OCIE1A
OCIE0A
-
TOIE1
TOIE0
-
page 135
page 106
(0x6E)
-
-
-
-
-
(0x6D)
-
-
-
-
PCINT12
PCINT4
ISC60
ISC20
-
-
PCINT11
PCINT3
ISC51
ISC11
-
(0x6C)
-
PCINT7
ISC71
ISC31
-
-
PCINT6
ISC70
ISC30
-
-
PCINT5
ISC61
ISC21
-
PCINT10
PCINT2
ISC50
ISC10
-
PCINT9
PCINT1
ISC41
ISC01
PCIE1
-
PCINT8
PCINT0
ISC40
ISC00
PCIE0
-
page 87
page 87
page 85
page 84
page 86
(0x6B)
(0x6A)
(0x69)
EICRA
(0x68)
PCICR
(0x67)
Reserved
OSCCAL
PRR1
-
-
-
-
-
-
(0x66)
Oscillator Calibration Register
page 38
page 46
page 46
page 196
page 57
page 39
page 56
page 9
(0x65)
PRUSB
-
-
-
-
-
-
PRUSART1
(0x64)
PRR0
-
-
PRTIM0
-
PRTIM1
PRSPI
-
-
(0x63)
REGCR
WDTCKD
CLKPR
WDTCSR
SREG
-
-
-
-
-
-
-
REGDIS
(0x62)
-
-
WDEWIFCM
WCLKD2
WDEWIF
WDEWIE
WCLKD1
WCLKD0
(0x61)
CLKPCE
-
-
-
CLKPS3
CLKPS2
CLKPS1
CLKPS0
(0x60)
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
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)
I
T
H
S
V
N
Z
C
SPH
SP15
SP14
SP13
SP12
SP11
SP10
SP9
SP8
page 12
page 12
SPL
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
Reserved
Reserved
Reserved
Reserved
Reserved
SPMCSR
Reserved
MCUCR
MCUSR
SMCR
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PGERS
-
-
SPMEN
-
SPMIE
RWWSB
SIGRD
RWWSRE
BLBSET
PGWRT
page 242
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
WDRF
SM2
-
-
BORF
SM1
-
IVSEL
EXTRF
SM0
-
IVCE
PORF
SE
page 65, 82
page 55
USBRF
-
-
page 45
Reserved
DWDR
-
debugWIRE Data Register
page 245
page 224
ACSR
ACD
-
ACBG
-
ACO
-
ACI
-
ACIE
-
ACIC
-
ACIS1
-
ACIS0
-
Reserved
SPDR
SPI Data Register
-
page 147
page 146
page 145
page 24
page 24
page 40
page 106
page 106
page 106
page 105
page 105
page 89
page 20
page 20
page 20
page 21
page 25
page 86
page 86
page 86
SPSR
SPIF
SPIE
WCOL
SPE
-
-
-
-
SPI2X
SPR0
SPCR
DORD
MSTR
CPOL
CPHA
SPR1
GPIOR2
GPIOR1
PLLCSR
OCR0B
OCR0A
TCNT0
General Purpose I/O Register 2
General Purpose I/O Register 1
-
-
-
PLLP2
PLLP1
PLLP0
PLLE
PLOCK
Timer/Counter0 Output Compare Register B
Timer/Counter0 Output Compare Register A
Timer/Counter0 (8 Bit)
TCCR0B
TCCR0A
GTCCR
EEARH
EEARL
FOC0A
COM0A1
TSM
FOC0B
-
-
WGM02
CS02
CS01
CS00
COM0A0
COM0B1
COM0B0
-
-
-
-
WGM01
PSRASY
WGM00
-
-
-
-
-
-
PSRSYNC
-
EEPROM Address Register High Byte
EEPROM Address Register Low Byte
EEPROM Data Register
EEDR
EECR
-
-
EEPM1
EEPM0
EERIE
EEMPE
EEPE
EERE
GPIOR0
EIMSK
General Purpose I/O Register 0
INT7
INTF7
-
INT6
INTF6
-
INT5
INTF5
-
INT4
INTF4
-
INT3
INTF3
-
INT2
INTF2
-
INT1
INTF1
PCIF1
INT0
INTF0
PCIF0
EIFR
PCIFR
290
7799D–AVR–11/10
ATMEL [ ATMEL ]
