SAM7X128_14 Datasheet, PDF (462/662 Pages) ATMEL Corporation – ARM-based Flash MCU

34.6.12 UDP Transceiver Control Register
Register Name:
UDP_ TXVC
Access Type:
Read-write
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
–
–
–
–
–
–
9
8
–
TXVDIS
7
6
5
4
3
2
1
0
–
–
–
–
–
–
–
–
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_TXCV register.
• TXVDIS: Transceiver Disable
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.
NOTE: If the USB pullup is not connected on DP, the user should not write in any UDP register other than the UDP_ TXVC regis-
ter. This is because if DP and DM are floating at 0, or pulled down, then SE0 is received by the device with the consequence of a
USB Reset.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
462