PORTSEL=PORTU1
USB Port Select. The USBPortSel register is identical to the OTGStCtrl register (see Section 15.8.6). In device-only operations only bits 0 and 1 of this register are used to control the routing of USB pins to Port 1 or Port 2.
| PORTSEL | Selects which USB port the device controller signals are mapped to. Other values are reserved. 0 (PORTU1): The USB device controller signals are mapped to the U1 port: USB_CONNECT1, USB_UP_LED1, USB_D+1, USB_D-1. 3 (PORTU2): The USB device controller signals are mapped to the U2 port: USB_CONNECT2, USB_UP_LED2, USB_D+2, USB_D-2. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| 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 15.9. Hardware clears this bit when HNP_SUCCESS or HNP_FAILURE is set. |
| A_HNP_TRACK | Enable HNP tracking for A-device (host), see Section 15.9. 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 15.9. 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. |