Datasheet

414
42023E–SAM–07/2013
ATSAM4L8/L4/L2
17.7.3.9 Host Frame Number Register
Register Name: UHFNUM
Access Type: Read/Write
Offset: 0x0420
Reset Value: 0x00000000
• 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
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]
76543210
FNUM[4:0] - - -