OTG Status and Control and USB port select
| PORT_FUNC | Controls connection of USB functions (see Figure 51). Bit 0 is set or cleared by hardware when B_HNP_TRACK or A_HNP_TRACK is set and HNP succeeds. See Section 14.9. 00: U1 = device (OTG), U2 = host 01: U1 = host (OTG), U2 = host 10: Reserved 11: U1 = host, U2 = device In a device-only configuration, the following values are allowed: 00: U1 = device. The USB device controller signals are mapped to the U1 port: USB_CONNECT1, USB_UP_LED1, USB_D+1, USB_D-1. 11: U2 = device. The USB device controller signals are mapped to the U2 port: USB_CONNECT2, USB_UP_LED2, USB_D+2, USB_D-2. |
| TMR_SCALE | Timer scale selection. This field determines the duration of each timer count. 00: 10 ms (100 KHz) 01: 100 ms (10 KHz) 10: 1000 ms (1 KHz) 11: Reserved |
| TMR_MODE | Timer mode selection. 0: monoshot 1: free running |
| TMR_EN | Timer enable. When set, TMR_CNT increments. When cleared, TMR_CNT is reset to 0. |
| TMR_RST | Timer reset. Writing one to this bit resets TMR_CNT to 0. This provides a single bit control for the software to restart the timer when the timer is enabled. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| B_HNP_TRACK | Enable HNP tracking for B-device (peripheral), see Section 14.9. Hardware clears this bit when HNP_SUCCESS or HNP_FAILURE is set. |
| A_HNP_TRACK | Enable HNP tracking for A-device (host), see Section 14.9. Hardware clears this bit when HNP_SUCCESS or HNP_FAILURE is set. |
| PU_REMOVED | When the B-device changes its role from peripheral to host, software sets this bit when it removes the D+ pull-up, see Section 14.9. Hardware clears this bit when HNP_SUCCESS or HNP_FAILURE is set. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| TMR_CNT | Current timer count value. |