288
7799D–AVR–11/10
ATmega8U2/16U2/32U2
28. Register Summary
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Page
(0xFF)
Reserved
-
(0xFE)
Reserved
-
(0xFD)
Reserved
-
(0xFC)
Reserved
-
(0xFB)
UPOE
UPWE1
UPWE0
UPDRV1
UPDRV0
SCKI
DATAI
DPI
DMI
(0xFA)
Reserved
-
(0xF9)
Reserved
-
(0xF8)
Reserved
-
(0xF7)
Reserved
-
(0xF6)
Reserved
-
(0xF5)
Reserved
-
(0xF4)
UEINT
-
EPINT4:0
(0xF3)
Reserved
-
(0xF2)
UEBCLX
BYCT7:0
(0xF1)
UEDATX
DAT7:0
(0xF0)
UEIENX
FLERRE
NAKINE
-
NAKOUTE
RXSTPE
RXOUTE
STALLEDE
TXINE
(0xEF)
UESTA1X
-
CTRLDIR
CURRBK1:0
(0xEE)
UESTA0X
CFGOK
OVERFI
UNDERFI
-
DTSEQ1:0
NBUSYBK1:0
(0xED)
UECFG1X
-
EPSIZE2:0
EPBK1:0
ALLOC
-
(0xEC)
UECFG0X
EPTYPE1:0
-
EPDIR
(0xEB)
UECONX
-
STALLRQ
STALLRQC
RSTDT
-
EPEN
(0xEA)
UERST
-
EPRST4:0
(0xE9)
UENUM
-
EPNUM2:0
(0xE8)
UEINTX
FIFOCON
NAKINI
RWAL
NAKOUTI
RXSTPI
RXOUTI
STALLEDI
TXINI
(0xE7)
Reserved
-
(0xE6)
UDMFN
-
FNCERR
-
(0xE5)
UDFNUMH
-
FNUM10:8
(0xE4)
UDFNUML
FNUM7:0
(0xE3)
UDADDR
ADDEN
UADD6:0
(0xE2)
UDIEN
-
UPRSME
EORSME
WAKEUPE
EORSTE
SOFE
-
SUSPE
(0xE1)
UDINT
-
UPRSMI
EORSMI
WAKEUPI
EORSTI
SOFI
-
SUSPI
(0xE0)
UDCON
-
RPUTX
-
RSTCPU
RMWKUP
DETACH
(0xDF)
Reserved
-
(0xDE)
Reserved
-
(0xDD)
Reserved
-
(0xDC)
Reserved
-
(0xDB)
Reserved
-
(0xDA)
Reserved
-
(0xD9)
Reserved
-
(0xD8)
USBCON
USBE
-
FRZCLK
-
(0xD7)
Reserved
-
(0xD6)
Reserved
-
(0xD5)
Reserved
-
(0xD4)
Reserved
-
(0xD3)
Reserved
-
(0xD2)
CLKSTA
-
RCON
EXTON
(0xD1)
CLKSEL1
RCCKSEL3
RCCKSEL2
RCCKSEL1
RCCKSEL0
EXCKSEL3
EXCKSEL2
EXCKSEL1
EXCKSEL0
(0xD0)
CLKSEL0
RCSUT1
RCSUT0
EXSUT1
EXSUT0
RCE
EXTE
-
CLKS
(0xCF)
Reserved
-
(0xCE)
UDR1
USART1 I/O Data Register
(0xCD)
UBRR1H
-
USART1 Baud Rate Register High Byte
(0xCC)
UBRR1L
USART1 Baud Rate Register Low Byte
(0xCB)
UCSR1D
-
CTSEN
RTSEN
(0xCA)
UCSR1C
UMSEL11
UMSEL10
UPM11
UPM10
USBS1
UCSZ11
UCSZ10
UCPOL1
(0xC9)
UCSR1B
RXCIE1
TXCIE1
UDRIE1
RXEN1
TXEN1
UCSZ12
RXB81
TXB81
(0xC8)
UCSR1A
RXC1
TXC1
UDRE1
FE1
DOR1
PE1
U2X1
MPCM1
(0xC7)
Reserved
-
(0xC6)
Reserved
-
(0xC5)
Reserved
-
(0xC4)
Reserved
-
(0xC3)
Reserved
-
(0xC2)
Reserved
-
(0xC1)
Reserved
-
(0xC0)
Reserved
-
(0xBF)
Reserved
-