Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet
Product codes
ATSAM4S-EK2
966
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
39.7.13 UDP Transceiver Control Register
Name:
UDP_TXVC
Address:
0x40034074
Access:
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.
tions to the UDP registers including the UDP_TXVC 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.
done by setting TXVDIS field.
To enable the transceiver, TXVDIS must be cleared.
• PUON: Pull-up On
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.
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
–
–
–
–
–
–
–
–