DSPIC30F3013-20I/ML【PDF 29/161 页】IC DSPIC MCU/DSP 24K 44QFN

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PIC18F46J11 FAMILY

DS39932D-page 154

2011 Microchip Technology Inc.

Choosing the configuration requires the review of all

PPSs and their pin assignments, especially those that

will not be used in the application. In all cases, unused

pin selectable peripherals should be disabled com-

pletely. Unused peripherals should have their inputs

assigned to an unused RPn pin function. I/O pins with

unused RPn functions should be configured with the

null peripheral output.

The assignment of a peripheral to a particular pin does

not automatically perform any other configuration of the

pin’s I/O circuitry. In theory, this means adding a pin

selectable output to a pin may mean inadvertently driv-

ing an existing peripheral input when the output is

driven. Users must be familiar with the behavior of

other fixed peripherals that share a remappable pin and

know when to enable or disable them. To be safe, fixed

digital peripherals that share the same pin should be

disabled when not in use.

Along these lines, configuring a remappable pin for a

specific peripheral does not automatically turn that

feature on. The peripheral must be specifically config-

ured for operation and enabled, as if it were tied to a

fixed pin. Where this happens in the application code

(immediately following device Reset and peripheral

configuration or inside the main application routine)

depends on the peripheral and its use in the

application.

A final consideration is that the PPS functions neither

override analog inputs nor reconfigure pins with analog

functions for digital I/O. If a pin is configured as an

analog input on device Reset, it must be explicitly

reconfigured as digital I/O when used with a PPS.

Example 10-7 provides a configuration for bidirectional

communication with flow control using EUSART2. The

following input and output functions are used:

Input Function RX2

Output Function TX2

EXAMPLE 10-7:

CONFIGURING EUSART2

INPUT AND OUTPUT

FUNCTIONS

Note:

If the Configuration bit, IOL1WAY = 1,

once the IOLOCK bit is set, it cannot be

cleared, preventing any future RP register

changes. The IOLOCK bit is cleared back

to ‘0’ on any device Reset.

;*************************************

; Unlock Registers

;*************************************

; PPS registers are in BANK 14

MOVLB

0x0E

BCF

INTCON, GIE ; Disable interrupts

MOVLW

0x55

MOVWF

EECON2, 0

MOVLW

0xAA

MOVWF

EECON2, 0

; Turn off PPS Write Protect

BCF

PPSCON, IOLOCK, BANKED

;***************************

; Configure Input Functions

; (See Table 9-13)

;***************************

; Assign RX2 To Pin RP0

;***************************

MOVLW

0x00

MOVWF

RPINR16, BANKED

;***************************

; Configure Output Functions

; (See Table 9-14)

;***************************

; Assign TX2 To Pin RP1

;***************************

MOVLW

0x05

MOVWF

RPOR1, BANKED

;*************************************

; Lock Registers

;*************************************

MOVLW

0x55

MOVWF

EECON2, 0

MOVLW

0xAA

MOVWF

EECON2, 0

; Write Protect PPS

BSF PPSCON, IOLOCK, BANKED

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