PIC18LF23K22-ESLASHML datasheet(142/496 Pages) MICROCHIP

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PIC18(L)F2X/4XK22

DS41412C-page 142

Preliminary

 2010 Microchip Technology Inc.

10.4

PORTC Registers

PORTC is an 8-bit wide, bidirectional port. The

corresponding data direction register is TRISC. Setting

a TRISC bit (= 1) will make the corresponding PORTC

pin an input (i.e., disable the output driver). Clearing a

TRISC bit (= 0) will make the corresponding PORTC

pin an output (i.e., enable the output driver and put the

contents of the output latch on the selected pin).

The Data Latch register (LATC) is also memory

mapped. Read-modify-write operations on the LATC

PORTC.

PORTC is multiplexed with several peripheral functions

(Table 10-8). The pins have Schmitt Trigger input buf-

fers.

Some of these pin functions can be relocated to alter-

nate pins using the Control fuse bits in CONFIG3H.

RC0 is the default pin for T3CKI. Clearing the T3CMX

bit moves the pin function to RB5. RC1 is the default pin

for the CCP2 peripheral pin. Clearing the CCP2MX bit

moves the pin function to the RB3 pin.

Two other pin functions, P2B and CCP3, can be relo-

cated from their default pins to PORTC pins by clearing

the control fuses in CONFIG3H. Clearing P2BMX and

CCP3MX moves the pin functions to RC0 and RC6(1)/

RE0(2), respectively.

When enabling peripheral functions, care should be

taken in defining TRIS bits for each PORTC pin. The

EUSART and MSSP peripherals override the TRIS bit

to make a pin an output or an input, depending on the

peripheral configuration. Refer to the corresponding

peripheral section for additional information.

The contents of the TRISC register are affected by

peripheral overrides. Reading TRISC always returns

the current contents, even though a peripheral device

may be overriding one or more of the pins.

EXAMPLE 10-3:

INITIALIZING PORTC

10.4.1

PORTC OUTPUT PRIORITY

Each PORTC pin is multiplexed with other functions.

The pins, their combined functions and their output

priorities are briefly described here. For additional

information, refer to the appropriate section in this data

sheet.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the higher priority.

Table 10-4 lists the PORTC pin functions from the

highest to the lowest priority.

Analog input functions, such as ADC, comparator and

SR Latch inputs, are not shown in the priority lists.

These inputs are active when the I/O pin is set for

Analog mode using the ANSELx registers. Digital

output functions may control the pin when it is in Analog

mode with the priority shown below.

TABLE 10-7:

CONFIGURATION REGISTERS ASSOCIATED WITH PORTB

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

on Page

CONFIG3H

MCLRE

—

P2BMX

T3CMX

HFOFST

CCP3MX

PBADEN

CCP2MX

354

CONFIG4L

DEBUG

XINST

—

—LVP(1)

—

STRVEN

355

Legend:

— = unimplemented locations, read as ‘0’. Shaded bits are not used for PORTB.

Note 1:

Can only be changed when in high voltage programming mode.

Note:

On a Power-on Reset, these pins are con-

figured as analog inputs.

MOVLB

0xF

; Set BSR for banked SFRs

CLRF

PORTC

; Initialize PORTC by

; clearing output

; data latches

CLRF

LATC

; Alternate method

; to clear output

; data latches

MOVLW

0CFh

; Value used to

; initialize data

; direction

MOVWF

TRISC

; Set RC<3:0> as inputs

; RC<5:4> as outputs

; RC<7:6> as inputs

MOVLW

30h

; Value used to

; enable digital inputs

MOVWF

ANSELC ; RC<3:2> dig input enable

; No ANSEL bits for RC<1:0>

; RC<7:6> dig input enable

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