P0_22=GPIO_P0, P0_21=GPIO_PORT_0, P0_30=GPIO_P0, P0_24=GPIO_P0, P0_17=GPIO_P0, P0_20=GPIO_P0, P0_19=GPIO_P0, P0_29=GPIO_P0, P0_27=GPIO_P0, P0_25=GPIO_P0, P0_26=GPIO_P0, P0_28=GPIO_P0, P0_16=GPIO_P0, P0_18=GPIO_P0, P0_23=GPIO_P0
Pin function select register 1.
| P0_16 | Pin function select P0.16. 0 (GPIO_P0): GPIO P0.16 1 (RXD1): RXD1 2 (SSEL0): SSEL0 3 (SSEL): SSEL |
| P0_17 | Pin function select P0.17. 0 (GPIO_P0): GPIO P0.17 1 (CTS1): CTS1 2 (MISO0): MISO0 3 (MISO): MISO |
| P0_18 | Pin function select P0.18. 0 (GPIO_P0): GPIO P0.18 1 (DCD1): DCD1 2 (MOSI0): MOSI0 3 (MOSI): MOSI |
| P0_19 | Pin function select P019. 0 (GPIO_P0): GPIO P0.19. 1 (DSR1): DSR1 2 (RESERVED): Reserved 3 (SDA1): SDA1 |
| P0_20 | Pin function select P0.20. 0 (GPIO_P0): GPIO P0.20. 1 (DTR1): DTR1 2 (RESERVED): Reserved 3 (SCL1): SCL1 |
| P0_21 | Pin function select P0.21. 0 (GPIO_PORT_0): GPIO Port 0.21. 1 (RI1): RI1 2 (RESERVED): Reserved 3 (RD1): RD1 |
| P0_22 | Pin function select P022 0 (GPIO_P0): GPIO P0.22. 1 (RTS1): RTS1 2 (RESERVED): Reserved 3 (TD1): TD1 |
| P0_23 | Pin function select P023. 0 (GPIO_P0): GPIO P0.23. 1 (AD0): AD0.0 2 (I2SRX_CLK): I2SRX_CLK 3 (CAP3): CAP3.0 |
| P0_24 | Pin function select P0.24. 0 (GPIO_P0): GPIO P0.24. 1 (AD0): AD0.1 2 (I2SRX_WS): I2SRX_WS 3 (CAP3): CAP3.1 |
| P0_25 | Pin function select P0.25. 0 (GPIO_P0): GPIO P0.25 1 (AD0): AD0.2 2 (I2SRX_SDA): I2SRX_SDA 3 (TXD3): TXD3 |
| P0_26 | Pin function select P0.26. 0 (GPIO_P0): GPIO P0.26 1 (AD0): AD0.3 2 (AOUT): AOUT 3 (RXD3): RXD3 |
| P0_27 | Pin function select P0.27. 0 (GPIO_P0): GPIO P0.27 1 (SDA0): SDA0 2 (USB_SDA): USB_SDA 3 (RESERVED): Reserved |
| P0_28 | Pin function select P0.28. 0 (GPIO_P0): GPIO P0.28 1 (SCL0): SCL0 2 (USB_SCL): USB_SCL 3 (RESERVED): Reserved |
| P0_29 | Pin function select P0.29 0 (GPIO_P0): GPIO P0.29 1 (USB_DP): USB_D+ 2 (RESERVED): Reserved 3 (RESERVED): Reserved |
| P0_30 | Pin function select P0.30. 0 (GPIO_P0): GPIO P0.30 1 (USB_DM): USB_D- 2 (RESERVED): Reserved 3 (RESERVED): Reserved |
| RESERVED | Reserved |