22.2 PPS Inputs
Each digital peripheral has a dedicated PPS Peripheral Input Selection (xxxPPS) register with which the input pin to the peripheral is selected. Devices that have 20 leads or less (8/14/16/20) allow PPS routing to any I/O pin, while devices with 28 leads or more allow PPS routing to I/Os contained within two ports (see the table below).
Important: The notation “xxx” in the generic register name
is a placeholder for the peripheral identifier. For example, xxx = T0CKI for the T0CKIPPS
register.
Multiple peripherals can operate from the same source simultaneously. Port reads always return the pin level regardless of peripheral PPS selection. If a pin also has analog functions associated, the ANSEL bit for that pin must be cleared to enable the digital input buffer.
| Peripheral | PPS Input Register | 14-Pin Devices | 20-Pin Devices | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Default Pin Selection at POR | Register Reset Value at POR | Available Input Port | Default Pin Selection at POR | Register Reset Value at POR | Available Input Port | ||||||||
| Interrupt 0 | INT0PPS | RA2 | ‘b000 010 | A | — | C | W | RA2 | ‘b000 010 | A | B | C | W |
| Interrupt 1 | INT1PPS | RA4 | ‘b000 100 | A | — | C | W | RA4 | ‘b000 100 | A | B | C | W |
| Interrupt 2 | INT2PPS | RA5 | ‘b000 101 | A | — | C | W | RA5 | ‘b000 101 | A | B | C | W |
| Timer0 Clock | T0CKIPPS | RA2 | ‘b000 010 | A | — | C | W | RA2 | ‘b000 010 | A | B | C | W |
| Timer1 Clock | T1CKIPPS | RA5 | ‘b000 101 | A | — | C | W | RA5 | ‘b000 101 | A | B | C | W |
| Timer1 Gate | T1GPPS | RA4 | ‘b000 100 | A | — | C | W | RA4 | ‘b000 100 | A | B | C | W |
| Timer2 Input | T2INPPS | RA5 | ‘b000 101 | A | — | C | W | RA5 | ‘b000 101 | A | B | C | W |
| Timer4 Input | T4INPPS | RC1 | ‘b010 001 | A | — | C | W | RC1 | ‘b010 001 | A | B | C | W |
| Universal Timer Input 0 | TUIN0PPS | RA1 | ‘b000 001 | A | — | C | W | RA1 | ‘b000 001 | A | B | C | W |
| Universal Timer Input 1 | TUIN1PPS | RC0 | ‘b010 000 | A | — | C | W | RC0 | ‘b010 000 | A | B | C | W |
| CCP1 | CCP1PPS | RC5 | ‘b010 101 | A | — | C | W | RC5 | ‘b010 101 | A | B | C | W |
| CCP2 | CCP2PPS | RC3 | ‘b010 011 | A | — | C | W | RC3 | ‘b010 011 | A | B | C | W |
| PWM Input 0 | PWMIN0PPS | RC5 | ‘b010 101 | A | — | C | W | RC5 | ‘b010 101 | A | B | C | W |
| PWM Input 1 | PWMIN1PPS | RC3 | ‘b010 011 | A | — | C | W | RC3 | ‘b010 011 | A | B | C | W |
| PWM1 External Reset Source | PWM1ERSPPS | RA5 | ‘b000 101 | A | — | C | W | RA5 | ‘b000 101 | A | B | C | W |
| PWM2 External Reset Source | PWM2ERSPPS | RC1 | ‘b010 001 | A | — | C | W | RC1 | ‘b010 001 | A | B | C | W |
| CWG1 | CWG1PPS | RA2 | ‘b000 010 | A | — | C | — | RA2 | ‘b000 010 | A | B | C | — |
| CLCx Input 1 | CLCIN0PPS | RC3 | ‘b010 011 | A | — | C | W | RA2 | ‘b000 010 | A | B | C | W |
| CLCx Input 2 | CLCIN1PPS | RC4 | ‘b010 100 | A | — | C | W | RC3 | ‘b010 011 | A | B | C | W |
| CLCx Input 3 | CLCIN2PPS | RC1 | ‘b010 001 | A | — | C | W | RB6 | ‘b001 110 | A | B | C | W |
| CLCx Input 4 | CLCIN3PPS | RA5 | ‘b000 101 | A | — | C | W | RB5 | ‘b001 101 | A | B | C | W |
| UART1 Receive | U1RXPPS | RC5 | ‘b010 101 | A | — | C | W | RB5 | ‘b001 101 | A | B | C | W |
| UART1 Clear to Send | U1CTSPPS | RC4 | ‘b010 100 | A | — | C | — | RB7 | ‘b001 111 | A | B | C | — |
| UART2 Receive | U2RXPPS | RC1 | ‘b010 001 | A | — | C | W | RC1 | ‘b010 001 | A | B | C | W |
| UART2 Clear to Send | U2CTSPPS | RC0 | ‘b010 000 | A | — | C | — | RC0 | ‘b010 000 | A | B | C | — |
| SPI1 Clock | SPI1SCKPPS | RC0 | ‘b010 000 | A | — | C | W | RB6 | ‘b001 110 | A | B | C | W |
| SPI1 Data | SPI1SDIPPS | RC1 | ‘b010 001 | A | — | C | W | RB5 | ‘b001 101 | A | B | C | W |
| SPI1 Client Select | SPI1SSPPS | RC3 | ‘b010 011 | A | — | C | W | RC6 | ‘b010 110 | A | B | C | W |
| I2C1 Clock | I2C1SCLPPS(1) | RC0 | ‘b010 000 | A | — | C | — | RB6 | ‘b001 110 | A | B | C | — |
| I2C1 Data | I2C1SDAPPS(1) | RC1 | ‘b010 001 | A | — | C | — | RB5 | ‘b001 101 | A | B | C | — |
| ADC Auto-Conversion Trigger | ADACTPPS | RC3 | ‘b010 011 | A | — | C | W | RC3 | ‘b010 011 | A | B | C | W |
Note:
- Bidirectional pin. The corresponding output must select the same pin.