Information

42.4.24 USB Control Register (USBx_USBCTRL)
Addresses: USB0_USBCTRL is 4007_2000h base + 100h offset = 4007_2100h
Bit 7 6 5 4 3 2 1 0
Read
SUSP PDE
0
Write
Reset
1 1 0 0 0 0 0 0
USBx_USBCTRL field descriptions
Field Description
7
SUSP
Places the USB transceiver into the suspend state.
0 USB transceiver is not in suspend state.
1 USB transceiver is in suspend state.
6
PDE
Enables the weak pulldowns on the USB transceiver.
0 Weak pulldowns are disabled on D+ and D-
1 Weak pulldowns are enabled on D+ and D-.
5–0
Reserved
This read-only field is reserved and always has the value zero.
42.4.25 USB OTG Observe Register (USBx_OBSERVE)
Provides visibility on the state of the pull-ups and pull-downs at the transceiver. Useful
when interfacing to an external OTG control module via a serial interface.
Addresses: USB0_OBSERVE is 4007_2000h base + 104h offset = 4007_2104h
Bit 7 6 5 4 3 2 1 0
Read DPPU DPPD 0 DMPD 0 0
Write
Reset
0 1 0 1 0 0 0 0
USBx_OBSERVE field descriptions
Field Description
7
DPPU
Provides observability of the D+ Pull Up signal output from the USB OTG module.
0 D+ pullup disabled.
1 D+ pullup enabled.
6
DPPD
Provides observability of the D+ Pull Down signal output from the USB OTG module.
0 D+ pulldown disabled.
1 D+ pulldown enabled.
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Memory Map/Register Definitions
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
1078 Freescale Semiconductor, Inc.