ATmega16U4/ATmega32U4
4. 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
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
UEINT
UEBCHX
UEBCLX
UEDATX
UEIENX
UESTA1X
UESTA0X
UECFG1X
UECFG0X
UECONX
UERST
UENUM
UEINTX
Reserved
UDMFN
UDFNUMH
UDFNUML
UDADDR
UDIEN
UDINT
UDCON
Reserved
Reserved
Reserved
Reserved
Reserved
USBINT
USBSTA
USBCON
UHWCON
Reserved
Reserved
DT4
Reserved
OCR4D
OCR4C
OCR4B
OCR4A
UDR1
UBRR1H
UBRR1L
Reserved
UCSR1C
UCSR1B
UCSR1A
CLKSTA
CLKSEL1
CLKSEL0
TCCR4E
TCCR4D
TCCR4C
TCCR4B
TCCR4A
TC4H
Bit 7
-
-
-
-
-
-
-
-
-
-
-
-
Bit 6
-
-
-
-
-
-
-
-
-
-
-
-
Bit 5
-
-
-
-
-
-
-
-
-
-
-
-
Bit 4
-
-
-
-
-
-
-
-
-
-
-
Bit 3
-
-
-
-
-
-
-
-
-
-
EPINT6:0
-
BYCT7:0
DAT7:0
Bit 2
-
-
-
-
-
-
-
-
-
-
Bit 1
-
-
-
-
-
-
-
-
-
-
-
BYCT10:8
Bit 0
-
-
-
-
-
-
-
-
-
-
-
Page
FLERRE
-
CFGOK
NAKINE
-
OVERFI
-
-
UNDERFI
EPSIZE2:0
-
NAKOUTE
-
-
-
STALLRQC
-
NAKOUTI
-
FNCERR
-
RXSTPE
-
RXOUTE
CTRLDIR
STALLEDE
TXINE
CURRBK1:0
NBUSYBK1:0
ALLOC
-
EPDIR
EPEN
DTSEQ1:0
EPBK1:0
-
RSTDT
EPRST6:0
-
RXSTPI
-
-
-
FNUM7:0
UADD6:0
RXOUTI
-
-
-
-
-
-
-
EPTYPE1:0
-
-
-
FIFOCON
-
-
ADDEN
-
-
-
UPRSME
UPRSMI
-
-
NAKINI
-
-
-
STALLRQ
-
RWAL
-
-
-
EPNUM2:0
STALLEDI
TXINI
-
FNUM10:8
EORSME
EORSMI
-
WAKEUPE
WAKEUPI
-
EORSTE
EORSTI
RSTCPU
SOFE
SOFI
LSM
MSOFE
MSOFI
RMWKUP
SUSPE
SUSPI
DETACH
-
-
USBE
-
-
-
-
-
-
-
FRZCLK
-
-
-
OTGPADE
-
-
-
-
-
-
-
-
-
-
ID
-
-
VBUSTI
VBUS
VBUSTE
UVREGE
DT4H3
DT4H2
DT4H1
DT4H0
DT4L3
DT4L2
DT4L1
DT4L0
Timer/Counter4 - Output Compare Register D
Timer/Counter4 - Output Compare Register C
Timer/Counter4 - Output Compare Register B
Timer/Counter4 - Output Compare Register A
USART1 I/O Data Register
-
-
UMSEL11
RXCIE1
RXC1
-
RCCKSEL3
RCSUT1
TLOCK4
FPIE4
COM4A1S
PWM4X
COM4A1
-
-
-
UMSEL10
TXCIE1
TXC1
-
RCCKSEL2
RCSUT0
ENHC4
FPEN4
COM4A0S
PSR4
COM4A0
-
-
-
UPM11
UDRIE1
UDRE1
-
RCCKSEL1
EXSUT1
OC4OE5
FPNC4
COM4B1S
DTPS41
COM4B1
-
-
-
UPM10
RXEN1
FE1
-
RCCKSEL0
EXSUT0
OC4OE4
FPES4
COM4B0S
DTPS40
COM4B0
-
-
USBS1
TXEN1
DOR1
-
EXCKSEL3
RCE
OC4OE3
FPAC4
COM4D1S
CS43
FOC4A
-
USART1 Baud Rate Register High Byte
-
UCSZ11
UCSZ12
PE1
-
EXCKSEL2
EXTE
OC4OE2
FPF4
COM4D0S
CS42
FOC4B
-
UCSZ10
RXB81
U2X1
RCON
EXCKSEL1
-
OC4OE1
WGM41
FOC4D
CS41
PWM4A
Timer/Counter4 High Byte
-
UCPOL1
TXB81
MPCM1
EXTON
EXCKSEL0
CLKS
OC4OE0
WGM40
PWM4D
CS40
PWM4B
USART1 Baud Rate Register Low Byte
9
7766DS–AVR–01/09
ATMEL [ ATMEL CORPORATION ]
