P1_27=GPIO_P1, P1_26=GPIO_P1, P1_16=GPIO_P1, P1_20=GPIO_P1, P1_22=GPIO_P1, P1_23=GPIO_P1, P1_29=GPIO_P1, P1_30=GPIO_P1, P1_21=GPIO_P1, P1_25=GPIO_P1, P1_19=GPIO_P1, P1_17=GPIO_P1, P1_28=GPIO_P1, P1_24=GPIO_P1, P1_18=GPIO_P1, P1_31=GPIO_PORT_1
Pin function select register 3.
| P1_16 | Pin function select P1.16. 0 (GPIO_P1): GPIO P1.16 1 (ENET_MDC): ENET_MDC 2 (RESERVED): Reserved 3 (RESERVED): Reserved |
| P1_17 | Pin function select P1.17. 0 (GPIO_P1): GPIO P1.17 1 (ENET_MDIO): ENET_MDIO 2 (RESERVED): Reserved 3 (RESERVED): Reserved |
| P1_18 | Pin function select P1.18. 0 (GPIO_P1): GPIO P1.18 1 (USB_UP_LED): USB_UP_LED 2 (PWM1): PWM1.1 3 (CAP1): CAP1.0 |
| P1_19 | Pin function select P1.19. 0 (GPIO_P1): GPIO P1.19. 1 (MCOA0): MCOA0 2 (USB_PPWR): USB_PPWR 3 (CAP1): CAP1.1 |
| P1_20 | Pin function select P1.20. 0 (GPIO_P1): GPIO P1.20. 1 (MCI0): MCI0 2 (PWM1): PWM1.2 3 (SCK0): SCK0 |
| P1_21 | Pin function select P1.21. 0 (GPIO_P1): GPIO P1.21. 1 (MCABORT): MCABORT 2 (PWM1): PWM1.3 3 (SSEL0): SSEL0 |
| P1_22 | Pin function select P1.22 0 (GPIO_P1): GPIO P1.22. 1 (MCOB0): MCOB0 2 (USB_PWRD): USB_PWRD 3 (MAT1): MAT1.0 |
| P1_23 | Pin function select P1.23. 0 (GPIO_P1): GPIO P1.23. 1 (MCI1): MCI1 2 (PWM1): PWM1.4 3 (MISO0): MISO0 |
| P1_24 | Pin function select P1.24. 0 (GPIO_P1): GPIO P1.24. 1 (MCI2): MCI2 2 (PWM1): PWM1.5 3 (MOSI0): MOSI0 |
| P1_25 | Pin function select P1.25. 0 (GPIO_P1): GPIO P1.25 1 (MCOA1): MCOA1 2 (RESERVED): Reserved 3 (MAT1): MAT1.1 |
| P1_26 | Pin function select P1.26. 0 (GPIO_P1): GPIO P1.26 1 (MCOB1): MCOB1 2 (PWM1): PWM1.6 3 (CAP0): CAP0.0 |
| P1_27 | Pin function select P1.27. 0 (GPIO_P1): GPIO P1.27 1 (CLKOUT): CLKOUT 2 (USB_OVRCR): USB_OVRCR 3 (CAP0): CAP0.1 |
| P1_28 | Pin function select P1.28. 0 (GPIO_P1): GPIO P1.28 1 (MCOA2): MCOA2 2 (PCAP1): PCAP1.0 3 (MAT0): MAT0.0 |
| P1_29 | Pin function select P1.29 0 (GPIO_P1): GPIO P1.29 1 (MCOB2): MCOB2 2 (PCAP1): PCAP1.1 3 (MAT0): MAT0.1 |
| P1_30 | Pin function select P1.30. 0 (GPIO_P1): GPIO P1.30 1 (RESERVED): Reserved 2 (VBUS): VBUS 3 (AD0): AD0.4 |
| P1_31 | Pin function select P1.31. 0 (GPIO_PORT_1): GPIO Port 1.31 1 (RESERVED): Reserved 2 (SCK1): SCK1 3 (AD0): AD0.5 |