at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 705

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

37.6.11
Register Name:UDP_FDRx [x = 0..5]
Access Type: Read-write
• FIFO_DATA[7:0]: FIFO Data Value
The microcontroller can push or pop values in the FIFO through this register.
RXBYTECNT in the corresponding UDP_CSRx register is the number of bytes to be read from the FIFO (sent by the host).
The maximum number of bytes to write is fixed by the Max Packet Size in the Standard Endpoint Descriptor. It can not be
more than the physical memory size associated to the endpoint. Refer to the Universal Serial Bus Specification, Rev. 2.0
for more information.
6384B–ATARM–15-Dec-08
31
23
15
–
–
–
7
UDP FIFO Data Register
30
22
14
–
–
–
6
29
21
13
–
–
–
5
28
20
12
–
–
–
4
FIFO_DATA
27
19
11
–
–
–
3
AT91SAM9G20 Preliminary
26
18
10
–
–
–
2
25
17
–
–
9
–
1
24
16
–
–
8
–
0
705