at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 691

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

37.6.3
Register Name:UDP_FADDR
Access Type: Read-write
• FADD[6:0]: Function Address Value
The Function Address Value must be programmed by firmware once the device receives a set address request from the
host, and has achieved the status stage of the no-data control sequence. Refer to the Universal Serial Bus Specification,
Rev. 2.0 for more information. After power up or reset, the function address value is set to 0.
• FEN: Function Enable
Read:
0 = Function endpoint disabled.
1 = Function endpoint enabled.
Write:
0 = Disables function endpoint.
1 = Default value.
The Function Enable bit (FEN) allows the microcontroller to enable or disable the function endpoints. The microcontroller
sets this bit after receipt of a reset from the host. Once this bit is set, the USB device is able to accept and transfer data
packets from and to the host.
6384B–ATARM–15-Dec-08
31
23
15
–
–
–
7
–
UDP Function Address Register
30
22
14
–
–
–
6
29
21
13
–
–
–
5
28
20
12
–
–
–
4
FADD
27
19
11
–
–
–
3
AT91SAM9G20 Preliminary
26
18
10
–
–
–
2
25
17
–
–
9
–
1
FEN
24
16
–
–
8
0
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