SAM4L Datasheet, PDF (387/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

17.7.2.9 Device Frame Number Register
Register Name:
UDFNUM
Access Type:
Read-Only
Offset:
0x0020
Reset Value:
0x00000000
ATSAM4L4/L2
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
-
-
-
-
-
-
-
-
15
14
13
12
11
10
9
8
FNCERR
-
FNUM[10:5]
7
6
5
4
3
2
1
0
FNUM[4:0]
-
-
-
• FNCERR: Frame Number CRC Error
This bit is cleared upon receiving a USB reset.
This bit is set when a corrupted frame number is received. This bit and the SOF interrupt bit are updated at the same time.
• FNUM: Frame Number
This field is cleared upon receiving a USB reset.
This field contains the 11-bit frame number information, as provided from the last SOF packet.
FNUM is updated even if a corrupted SOF is received.
42023C–SAM–02/2013
387