41.2 UDPHS Frame Number Register
| Name: | UDPHS_FNUM |
| Offset: | 0x04 |
| Reset: | 0x00000000 |
| Property: | Read-only |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| FNUM_ERR | |||||||||
| Access | R | ||||||||
| Reset | 0 |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| FRAME_NUMBER[10:5] | |||||||||
| Access | R | R | R | R | R | R | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| FRAME_NUMBER[4:0] | MICRO_FRAME_NUM[2:0] | ||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bit 31 – FNUM_ERR Frame Number CRC Error (cleared upon USB reset)
This bit is set by hardware when a corrupted Frame Number in Start of Frame packet (or Micro SOF) is received.
This bit and the INT_SOF (or MICRO_SOF) interrupt are updated at the same time.
Bits 13:3 – FRAME_NUMBER[10:0] Frame Number as defined in the Packet Field Formats (cleared upon USB reset)
This field is provided in the last received SOF packet (see UDPHS_IEN.INT_SOF).
Bits 2:0 – MICRO_FRAME_NUM[2:0] Microframe Number (cleared upon USB reset)
Number of the received microframe (0 to 7) in one frame.This field is reset at the beginning of each new frame (1 ms).
One microframe is received each 125 microseconds (1 ms/8).