ATmega8U2/16U2/32U2
6. Register Summary
Address
(0xFF)
(0xFE)
(0xFD)
(0xFC)
(0xFB)
(0xFA)
(0xF9)
(0xF8)
(0xF7)
(0xF6)
(0xF5)
(0xF4)
(0xF3)
(0xF2)
(0xF1)
(0xF0)
(0xEF)
(0xEE)
(0xED)
(0xEC)
(0xEB)
(0xEA)
(0xE9)
(0xE8)
(0xE7)
(0xE6)
(0xE5)
(0xE4)
(0xE3)
(0xE2)
(0xE1)
(0xE0)
(0xDF)
(0xDE)
(0xDD)
(0xDC)
(0xDB)
(0xDA)
(0xD9)
(0xD8)
(0xD7)
(0xD6)
(0xD5)
(0xD4)
(0xD3)
(0xD2)
(0xD1)
(0xD0)
(0xCF)
(0xCE)
(0xCD)
(0xCC)
(0xCB)
(0xCA)
(0xC9)
(0xC8)
(0xC7)
(0xC6)
(0xC5)
(0xC4)
(0xC3)
(0xC2)
(0xC1)
(0xC0)
(0xBF)
Name
Reserved
Reserved
Reserved
Reserved
UPOE
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
UEINT
Reserved
UEBCLX
UEDATX
UEIENX
UESTA1X
UESTA0X
UECFG1X
UECFG0X
UECONX
UERST
UENUM
UEINTX
Reserved
UDMFN
UDFNUMH
UDFNUML
UDADDR
UDIEN
UDINT
UDCON
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
USBCON
Reserved
Reserved
Reserved
Reserved
Reserved
CLKSTA
CLKSEL1
CLKSEL0
Reserved
UDR1
UBRR1H
UBRR1L
UCSR1D
UCSR1C
UCSR1B
UCSR1A
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Bit 7
-
-
-
-
UPWE1
-
-
-
-
-
-
-
Bit 6
-
-
-
-
UPWE0
-
-
-
-
-
-
-
-
Bit 5
-
-
-
-
UPDRV1
-
-
-
-
-
-
-
-
Bit 4
-
-
-
-
UPDRV0
-
-
-
-
-
-
-
Bit 3
-
-
-
-
SCKI
-
-
-
-
-
-
-
BYCT7:0
DAT7:0
Bit 2
-
-
-
-
DATAI
-
-
-
-
-
-
EPINT4:0
-
Bit 1
-
-
-
-
DPI
-
-
-
-
-
-
-
Bit 0
-
-
-
-
DMI
-
-
-
-
-
-
Page
page 195
page 222
-
page 221
page 221
FLERRE
-
CFGOK
-
NAKINE
-
OVERFI
-
-
UNDERFI
EPSIZE2:0
-
NAKOUTE
-
-
-
STALLRQC
-
NAKOUTI
-
FNCERR
-
RXSTPE
-
RXOUTE
CTRLDIR
STALLEDE
TXINE
page 220
page 218
page 217
CURRBK1:0
NBUSYBK1:0
ALLOC
-
EPDIR
EPEN
DTSEQ1:0
EPBK1:0
-
RSTDT
-
RXSTPI
-
-
-
FNUM7:0
UADD6:0
RXOUTI
-
-
-
-
EPRST4:0
-
-
page 216
page 215
page 214
page 214
page 214
EPTYPE1:0
-
-
-
FIFOCON
-
-
-
ADDEN
-
-
-
-
-
-
-
-
-
-
USBE
-
-
-
-
-
-
RCCKSEL3
RCSUT1
-
-
-
UMSEL11
RXCIE1
RXC1
-
-
-
-
-
-
-
-
-
UPRSME
UPRSMI
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RCCKSEL2
RCSUT0
-
-
-
UMSEL10
TXCIE1
TXC1
-
-
-
-
-
-
-
-
-
-
-
-
NAKINI
-
-
-
STALLRQ
-
-
RWAL
-
-
-
EPNUM2:0
STALLEDI
-
-
FNUM10:8
TXINI
-
-
page 219
page 213
page 213
page 213
page 212
EORSME
EORSMI
-
-
-
-
-
-
-
-
FRZCLK
-
-
-
-
-
-
RCCKSEL1
EXSUT1
-
-
-
UPM11
UDRIE1
UDRE1
-
-
-
-
-
-
-
-
-
WAKEUPE
WAKEUPI
RPUTX
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RCCKSEL0
EXSUT0
-
-
-
UPM10
RXEN1
FE1
-
-
-
-
-
-
-
-
-
EORSTE
EORSTI
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
EXCKSEL3
RCE
-
SOFE
SOFI
RSTCPU
-
-
-
-
-
-
-
-
-
-
-
-
-
-
EXCKSEL2
EXTE
-
-
-
RMWKUP
-
-
-
-
-
-
-
-
-
-
-
-
-
RCON
EXCKSEL1
-
-
SUSPE
SUSPI
DETACH
-
-
-
-
-
-
-
-
-
-
-
-
-
EXTON
EXCKSEL0
CLKS
-
page 211
page 210
page 209
page 195
page 38
page 38
page 37
page 167
USART1 I/O Data Register
USART1 Baud Rate Register High Byte
-
USBS1
TXEN1
DOR1
-
-
-
-
-
-
-
-
-
-
UCSZ11
UCSZ12
PE1
-
-
-
-
-
-
-
-
-
CTSEN
UCSZ10
RXB81
U2X1
-
-
-
-
-
-
-
-
-
RTSEN
UCPOL1
TXB81
MPCM1
-
-
-
-
-
-
-
-
-
USART1 Baud Rate Register Low Byte
page 171
page 171
page 171
page 169
page 168
page 167
7
7799CS–AVR–12/09
ATMEL [ ATMEL CORPORATION ]
