DSPIC33EP64GS708 datasheet(138/484 Pages) MICROCHIP

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dsPIC33EPXXXGS70X/80X FAMILY

DS70005258C-page 138

 2016-2018 Microchip Technology Inc.

11.6.4

INPUT MAPPING

The inputs of the Peripheral Pin Select options are

mapped on the basis of the peripheral. That is, a control

will be mapped to. The RPINRx registers are used to

configure peripheral input mapping (see Register 11-9

through Register 11-32). Each register contains sets of

8-bit fields, with each set associated with one of the

remappable peripherals. Programming a given periph-

eral’s bit field with an appropriate 8-bit index value maps

the RPn pin with the corresponding value, or internal

signal, to that peripheral. See Table 11-11 for a list of

available inputs.

For example, Figure 11-2 illustrates remappable pin

selection for the U1RX input.

FIGURE 11-2:

REMAPPABLE INPUT FOR

U1RX

11.6.4.1

Virtual Connections

The dsPIC33EPXXXGS70X/80X devices support six

virtual RPn pins (RP176-RP181), which are identical in

functionality to all other RPn pins, with the exception of

pinouts. These six pins are internal to the devices and

are not connected to a physical device pin.

These pins provide a simple way for inter-peripheral

connection without utilizing a physical pin. For

example, the output of the analog comparator can be

connected to RP176 and the PWM Fault input can be

configured for RP176 as well. This configuration allows

the analog comparator to trigger PWM Faults without

the use of an actual physical pin on the device.

TABLE 11-11: REMAPPABLE

SOURCES

VSS

PWM4L

RP16

U1RX Input

U1RXR<7:0>

to Peripheral

RP181

181

Note:

For input only, Peripheral Pin Select func-

tionality does not have priority over TRISx

settings. Therefore, when configuring an

RPn pin for input, the corresponding bit in

the TRISx register must also be configured

for input (set to ‘1’).

Remap Index

Output Function

0VSS

1CMP1

2CMP2

3CMP3

4CMP4

5PWM4H

6PTGO30

7PTGO31

8-11

Reserved

REFO

SYNCO1

SYNCO2

PWM4L

16-20

RP16-RP20

21-31

Reserved

32-41

RP32-RP41

Reserved

43-58

RP43-RP58

Reserved

60-76

RP60-RP76

77-175

Reserved

176-181

RP176-RP181

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