27.5.13 USBDEVCTL Register (Offset = 0x60) [reset = 0x80]
USB Device Control (USBDEVCTL)
OTG A / Host
USBDEVCTL is an 8-bit register used for controlling and monitoring the USB VBUS line. If the PHY is suspended, no PHY clock is received and the VBUS is not sampled. In addition, in Host mode, USBDEVCTL provides the status information for the current operating mode (Host or Device) of the USB controller. If the USB controller is in Host mode, this register also indicates if a full- or low-speed Device has been connected.
USBDEVCTL is shown in Figure 27-18 and described in Table 27-23.
Return to Summary Table.
Figure 27-18 USBDEVCTL Register
| 7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| DEV |
FSDEV |
LSDEV |
VBUS |
HOST |
HOSTREQ |
SESSION |
| R-0x1 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R/W-0x0 |
R/W-0x0 |
|
Table 27-23 USBDEVCTL Register Field Descriptions
| Bit |
Field |
Type |
Reset |
Description |
| 7 |
DEV |
R |
0x1 |
Device Mode.
This value is only valid while a session is in progress.
0x0 = The USB controller is operating on the OTG A side of the cable.
0x1 = The USB controller is operating on the OTG B side of the cable.
|
| 6 |
FSDEV |
R |
0x0 |
Full-Speed Device Detected.
0x0 = A full-speed Device has not been detected on the port.
0x1 = A full-speed Device has been detected on the port.
|
| 5 |
LSDEV |
R |
0x0 |
Low-Speed Device Detected.
0x0 = A low-speed Device has not been detected on the port.
0x1 = A low-speed Device has been detected on the port.
|
| 4-3 |
VBUS |
R |
0x0 |
VBUS Level.
0x0 = Below SessionEnd
VBUS is detected as under 0.5 V.
0x1 = Above SessionEnd, below AValid
VBUS is detected as above 0.5 V and under 1.5 V.
0x2 = Above AValid, below VBUSValid
VBUS is detected as above 1.5 V and below 4.75 V.
0x3 = Above VBUSValid
VBUS is detected as above 4.75 V.
|
| 2 |
HOST |
R |
0x0 |
Host Mode.
This value is only valid while a session is in progress.
0x0 = The USB controller is acting as a Device.
0x1 = The USB controller is acting as a Host.
|
| 1 |
HOSTREQ |
R/W |
0x0 |
Host Request.
This bit is cleared when Host Negotiation is completed.
0x0 = No effect.
0x1 = Initiates the Host Negotiation when SUSPEND mode is entered.
|
| 0 |
SESSION |
R/W |
0x0 |
Session Start/End.
When operating as an OTG A device:When operating as an OTG B device: Clearing this bit when the USB controller is not suspended results in undefined behavior.
0x0 = When cleared by software, this bit ends a session.
0x1 = When set by software, this bit starts a session.
|