Datasheet

SAM9G20
DS60001516A-page 688  2017 Microchip Technology Inc.
36.6.12 UDP Transceiver Control Register
Name:UDP_TXVC
Access:Read/Write
WARNING: The UDP peripheral clock in the Power Management Controller (PMC) must be enabled before any read/write operations 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 set-
ting TXVDIS field.
To enable the transceiver, TXVDIS must be cleared.
PUON: Pullup On
0: The 1.5KΩ integrated pullup on DP is disconnected.
1: The 1.5 KΩ integrated pullup on DP is connected.
Note: If the USB pullup is not connected on DP, the user should not write in any UDP register other than the UDP_TXVC register.
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.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
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PUON TXVDIS
76543210
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