SAM4L Datasheet, PDF (408/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

17.7.3.9 Host Frame Number Register
Register Name:
UHFNUM
Access Type:
Read/Write
Offset:
0x0420
Reset Value:
0x00000000
ATSAM4L4/L2
31
30
29
28
27
26
25
24
-
-
-
-
-
-
-
-
23
22
21
20
19
18
17
16
FLENHIGH
15
14
13
12
11
10
9
8
-
-
FNUM[10:5]
7
6
5
4
3
2
1
0
FNUM[4:0]
-
-
-
• FLENHIGH: Frame Length
This field contains the 8 high-order bits of the 14-bits internal frame counter (frame counter at 12MHz, counter length is 12000
to ensure a SOF generation every 1 ms).
• FNUM: Frame Number
This field contains the current SOF number.
This field can be written by software to initialize a new frame number value. In this case, at the next SOF, the FNUM field takes
its new value
42023C–SAM–02/2013
408