Datasheet

569

AT32UC3A

30.8.2.8 USB Device Frame Number Register (UDFNUM)

Offset: 0x0020

Access Type: Read-Only

Reset Value: 0x00000000

• FNUM: Frame Number

Set by hardware. These bits are the 11-bit frame number information. They are provided in the last received SOF packet.

Cleared by hardware upon receiving a USB reset.

Note that FNUM is updated even if a corrupted SOF is received.

• FNCERR: Frame Number CRC Error

Set by hardware when a corrupted frame number is received. This bit and the SOF interrupt flag are updated at the same

time.

Cleared by hardware upon receiving a USB reset.

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

ru ru

0 0 0 0 0 0 0

7 6 5 4 3 2 1 0

FNUM – – –

0 0 0 0 0

32058K

AVR32-01/12