ByPic

Library_pps

// #include "http://www.byvac.com//mBlib/flb/Library/2016/lib_pps.bas"

Peripheral Pin Select (PPS) Applies to MX170 & MX370

This map refers to the MX170 devices. The SMD version of the MX170 also has port C shown in grey

	Peripheral	Pin
Inputs	INT4,T2CK,IC4,SS1,	PRA0	PRB3	PRB4	RB15	RB7	RRC7	RRC0	RRC5
Outputs	U1TXs,U2RTSs,SS1s,OC1s,C2OUTs
Inputs	INT3,T3CK, IC3,U1CTS,U2RX,SDI1	PRA1	PRB5	PRB1	RRB11	RRB8	RRA8	RRC8	RRA9
Outputs	SDO1s,SDO2s,OC2s
Inputs	INT2,T4CK,IC1,IC5,U1RX,U2CTS,SDI2,OCFB	PRA2	PRB6	PRA4	RB13	RB2	PRC6	PRC1	PRC3
Outputs	SDO1s,SDO2s,OC4s,OC5s,REFCLKO
Inputs	INT1,T5CK,IC2,SS2,OCFA	PRA3	PRB14	PRB0	PRB10	PRB9	PRC9	PRC2	PRC4
Outputs	U1RTSs,U2TXs,SS2s,OC3s,C1OUTs

This map refers to the MX370 devices. ** NOTE RPxx, above table uses PRxx

	Peripheral	Pin
Inputs	INT3,T2CK,IC3,U1RX,U2RX,U5CTS,REFCLKI	RPD2	RPG8	RPF4	RPD10	RPF1	RPB9	RPB10	RPC14	RPB5	RPF2
Outputs	U3TXs,U4RTSs,SD02s,OC3s,C2OUTs
Inputs	INT4,T5CK,IC4,U3RX,U4CTS,SDI1,SDI2	RPD3	RPG7	RPF5	RPD11	RPF0	RPB1	RPE5	RPC13	RPB3	RPF3
Outputs	SD02s,U2TXs,U1TXs,U5RTSs,SD01s,OC4s
Inputs	INT2,T4CK,IC2,IC5,U1CTS,U2CTS,SS1	RPD9	RPG6	RPB8	RPB15	RPD4	RPB0	RPE3	RPB7	RPB2
Outputs	SDO1s,U3RTSs,U4TXs,REFCLK0s,U5TXs,SS1s,OC5s,C1OUTs
Inputs	INT1,T3CK,IC1,U3CTS,U4RX,U5RX,SS2,OCFA	RPD1	RPG9	RPB14	RPD0	RPD8	RPB6	RPD5
Outputs	SD01s,U5TXs,U2RTSs,U1RTSs,SS2s,OC2s,OC1s

Special NOCONNECTs (see pps_out)

NOTES: The above are constants and should be prefixed with '*' when used in the pps functions, notice also that the output peripheral constants have a 's' postfix.

This function associates an input peripheral to a pin

pps_in(*peripheral(), *pin())

This function associates an output pin to a peripheral

pps_out(*pin(), *peripheral())

There is a special peripheral called NOCONNECTs. This is to disconnect an output peripheral as one output peripheral can be directed to more than one port. This is particularly useful for redirecting UART2.

How to Use

Example 1: Set up external interrupt 2, which is an input to be on RA4

pps_in(*INT2(), *PRA4()) // that's it, you will still need to set up the interrupt

Example 2: On all the boards UART1 is left for the user to use as UART is used for the main communication with the IC. So on the MX1 device we can set up on a choice of pins:

pps_out(*PRA0(), *U1TXs())
pps_in(*U1RX(), *PRA2())

The above will have U1TX coming out of pin RA0 and the input to the UART will be on pin RA2

HOT TIP
To use meaning full names when using the PPS a similar syntax is used as for the ports above. As an example, using the MX370 table setting up UART1 on port D2 and D3 could be:

pps_in(*U1RX(),*RPD2())
pps_out(*RPD3(),*U1TXs())

A better way is to define the port and pins as a constant, then it is easy to change them if required.

constant   RX   {RPD2(0),RPD2(1)}
constant   TX   {RPD3(0),RPD3(1)}

pps_in(*U1RX(),*RX())
pps_out(*RPD3(),*TX())