Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 966

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

UDP_TXVC

0x40034074

Read-write  

WARNING: The UDP peripheral clock in the Power Management Controller (PMC) must be enabled before any read/write opera-
tions to the UDP registers including the UDP_TXVC register.

When UDP is disabled, power consumption can be reduced significantly by disabling the embedded transceiver. This can be 
done by setting TXVDIS field.

To enable the transceiver, TXVDIS must be cleared.

0: The 1.5K

Ω integrated pull-up on DDP is disconnected.

1: The 1.5 K

Ω integrated pull-up on DDP is connected.

NOTE: If the USB pull-up is not connected on DDP, the user should not write in any UDP register other than the UDP_TXVC reg-
ister. This is because if DDP and DDM are floating at 0, or pulled down, then SE0 is received by the device with the consequence 
of 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

–

–

–

–

–

–

PUON

TXVDIS

7

6

5

4

3

2

1

0

–

–

–

–

–

–

–

–