Integrated Microcontroller Reference Manual

Universal Serial Bus, OTG Capable Controller
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
15-32 Freescale Semiconductor
15.4.1.24 USB OTG Observe Register (USB_OTG_OBSERVE)
IPSBAR
Offset: 0x1C_0104 (USB_OTG_OBSERVE)
Access: User read/write
76543210
R
DP_PU DP_PD
0
DM_PD VBUSE VBUSCHG VBUSDIS
1
W
Reset:11000011
Figure 15-31. USB OTG Observe Register
Table 15-36. USB_OTG_OBSERVE Field Descriptions
Field Description
7
DP_PU
Provides observability of the D+ Pull Up signal output from the USB OTG module. This bit is useful when
interfacing to an external OTG control module via a serial interface.
0 D+ pullup disabled.
1 D+ pullup enabled.
6
DP_PD
Provides observability of the D+ Pull Down signal output from the USB OTG module. Useful when interfacing
to an external OTG control module via a serial interface.
0 D+ pulldown disabled.
1 D+ pulldown enabled.
5
Reserved
Reserved. Should always read zero.
4
DM_PD
Provides observability of the D+ Pull Down signal output from the USB OTG module. Useful when interfacing
to an external OTG control module via a serial interface.
0 D+ pulldown disabled.
1 D+ pulldown enabled.
3
VBUSE
Provides observability of the VBUS Enable signal output from the USB OTG module. Useful when interfacing
to an external OTG control module via a serial interface.
0 VBUS is negated.
1 VBUS is asserted.
2
VBUSCHG
Provides observability of the VBUS Charge signal output from the USB OTG module. Useful when interfacing
to an external OTG control module via a serial interface.
0 VBUS Charge is negated.
1 VBUS Charge is asserted.
1
VBUSDIS
Provides observability of the VBUS Discharge signal output from the USB OTG module. Useful when
interfacing to an external OTG control module via a serial interface.
0 VBUS Discharge is negated.
1 VBUS Discharge is asserted.
0
Reserved
Reserved.