at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 689
at91sam9g20-cu
Manufacturer Part Number
at91sam9g20-cu
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9G20-CU.pdf
(814 pages)
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37.6.1
Register Name:UDP_FRM_NUM
Access Type: Read-only
• FRM_NUM[10:0]: Frame Number as Defined in the Packet Field Formats
This 11-bit value is incremented by the host on a per frame basis. This value is updated at each start of frame.
Value Updated at the SOF_EOP (Start of Frame End of Packet).
• FRM_ERR: Frame Error
This bit is set at SOF_EOP when the SOF packet is received containing an error.
This bit is reset upon receipt of SOF_PID.
• FRM_OK: Frame OK
This bit is set at SOF_EOP when the SOF packet is received without any error.
This bit is reset upon receipt of SOF_PID (Packet Identification).
In the Interrupt Status Register, the SOF interrupt is updated upon receiving SOF_PID. This bit is set without waiting for
EOP.
Note:
6384B–ATARM–15-Dec-08
31
23
15
---
–
–
7
In the 8-bit Register Interface, FRM_OK is bit 4 of FRM_NUM_H and FRM_ERR is bit 3 of FRM_NUM_L.
UDP Frame Number Register
30
22
14
---
–
–
6
29
---
21
13
–
–
5
28
20
12
---
–
–
4
FRM_NUM
27
19
11
---
–
–
3
AT91SAM9G20 Preliminary
26
18
10
---
–
2
FRM_NUM
FRM_OK
25
17
---
9
1
FRM_ERR
24
16
---
8
0
689
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