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.

Table 1. PPS Input Selection Table
Peripheral	PPS Input Register	Register Reset Value at POR		Default Pin Selection at POR
Peripheral	PPS Input Register	14/16-Pin Devices	20-Pin Devices	14/16-Pin Devices	20-Pin Devices
External Interrupt	INTPPS	`‘b000 010`		RA2
Timer0 Clock	T0CKIPPS	`‘b000 010`		RA2
Timer1 Clock	T1CKIPPS	`‘b000 101`		RA5
Timer1 Gate	T1GPPS	`‘b000 100`		RA4
Timer3 Clock	T3CKIPPS	`‘b010 101`		RC5
Timer3 Gate	T3GPPS	`‘b010 100`		RC4
Timer2 Input	T2INPPS	`‘b000 101`		RA5
Timer4 Input	T4INPPS	`‘b010 001`		RC1
Timer6 Input	T6INPPS	`‘b010 010`		RC2
CCP1	CCP1PPS	`‘b010 101`		RC5
CCP2	CCP2PPS	`‘b010 011`		RC3
CWG1	CWG1PPS	`‘b000 010`		RA2
CLCIN0	CLCIN0PPS	`‘b010 011`	`‘b000 010`	RC3	RA2
CLCIN1	CLCIN1PPS	`‘b010 100`	`‘b010 011`	RC4	RC3
CLCIN2	CLCIN2PPS	`‘b010 001`	`‘b001 100`	RC1	RB4
CLCIN3	CLCIN3PPS	`‘b000 101`	`‘b001 101`	RA5	RB5
SCL1/SCK1	SSP1CLKPPS⁽¹⁾	`‘b010 000`	`‘b001 110`	RC0	RB6
SDA1/SDI1	SSP1DATPPS⁽¹⁾	`‘b010 001`	`‘b001 100`	RC1	RB4
SS1	SSP1SSPPS	`‘b010 011`	`‘b010 110`	RC3	RC6
SCL2/SCK2	SSP2CLKPPS⁽¹⁾	`‘b010 100`	`‘b001 111`	RC4	RB7
SDA2/SDI2	SSP2DATPPS⁽¹⁾	`‘b010 101`	`‘b001 101`	RC5	RB5
SS2	SSP2SSPPS	`‘b000 000`	`‘b000 001`	RA0	RA1
RX1/DT1	RX1PPS	`‘b010 101`	`‘b001 101`	RC5	RB5
CK1	CK1PPS	`‘b010 100`	`‘b001 111`	RC4	RB7
RX2/DT2	RX2PPS	`‘b010 001`		RC1
CK2	CK2PPS	`‘b010 000`		RC0
ADC Conversion Trigger	ADACTPPS	`‘b010 010`		RC2

Note:

1.Bidirectional pin. The corresponding output must select the same pin.