| Bit15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| FNUM[10:5] | |||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| FNUM[4:0] | |||||||
| AccessR/W | R/W | R/W | R/W | R/W | |||
| Reset0 | 0 | 0 | 0 | 0 | |||
Frame Number
These bits contains the current SOF number.
These bits 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.
As the FNUM register lies across two consecutive byte addresses, writing byte-wise (8-bits) to the FNUM register may produce incorrect frame number generation. It is recommended to write FNUM register word-wise (32-bits) or half-word-wise (16-bits).