ATMEGA8U2_14 Datasheet, PDF (212/310 Pages) ATMEL Corporation – 125 Powerful Instructions – Most Single Clock Cycle Execution

ATmega8U2/16U2/32U2
• Bit 5 – EORSME: End Of Resume Interrupt Enable Bit
Writing this bit to one enables interrupt on EORSMI flag. An end of resume Upstream resume
interrupt will be generated only if the EORSME bit is set to one, the Global Interrupt Flag in
SREG is written to one, and the EORSMI bit is set.
• Bit 4 – WAKEUPE: Wake-up CPU Interrupt Enable Bit
Writing this bit to one enables interrupt on WAKEUPI flag. A wake-up interrupt will be generated
only if the WAKEUPE bit is set to one, the Global Interrupt Flag in SREG is written to one, and
the WAKEUPI bit is set.
• Bit 3 – EORSTE: End Of Reset Interrupt Enable Bit
Writing this bit to one enables interrupt on EORSTI flag. A USB reset interrupt will be generated
only if the EORSTE bit is set to one, the Global Interrupt Flag in SREG is written to one, and the
EORSTI bit is set.
• Bit 2 – SOFE: Start Of Frame Interrupt Enable Bit
Writing this bit to one enables interrupt on SOFI flag. A Start of Frame USB reset interrupt will be
generated only if the SOFE bit is set to one, the Global Interrupt Flag in SREG is written to one,
and the SOFI bit is set.
• Bit 1 – Res: Reserved
This bit is reserved and will always read as zero.
• Bit 0 – SUSPE: Suspend Interrupt Enable Bit
Writing this bit to one enables interrupt on SUSPI flag. A suspend interrupt will be generated
only if the SUSPE bit is set to one, the Global Interrupt Flag in SREG is written to one, and the
SUSPI bit is set.
21.18.4 UDADDR – USB Device Address Register
Bit
7
6
5
4
3
2
1
0
(0xE3)
ADDEN
UADD[6:0]
UDADDR
Read/Write
R/W
R
R
R
R
R
R
R
Initial Value
0
0
0
0
0
0
0
0
• Bit 7 – ADDEN: Address Enable Bit
Writing this bit to one will enable the UADD[6:0] field as device address for the USB controller.
When this bit is set the USB device controller will be able to answer all requests on the USB that
refer to the UADD[6:0] USB bus address.
See “Address Setup” on page 199 for more details.
• Bits 6:0 – UADD[6:0]: USB Address Bits
These bits contain the USB device address, thatthe USB controller should answer on the USB
bus. This address should be enabled writing one to the ADDEN bit.
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