Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet

42023E–SAM–07/2013

UDFNUM

Read-Only

0x0020

0x00000000

This bit is cleared upon receiving a USB reset.

This bit is set when a corrupted frame number is received. This bit and the SOF  interrupt bit are updated at the same time.

This field is cleared upon receiving a USB reset.

This field contains the 11-bit frame number information, as provided from the last SOF packet.

FNUM is updated even if a corrupted SOF is received.

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[10:5]

7

6

5

4

3

2

1

0

FNUM[4:0]

-

-

-