PIC18F2221 datasheet(117/402 Pages) MICROCHIP

117 / 402 page

DS39689F-page 117

PIC18F2221/2321/4221/4321 FAMILY

11.3

PORTC, TRISC and LATC

Registers

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

corresponding Data Direction register is TRISC. Set-

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

PORTC pin an input (i.e., put the corresponding output

driver in a High-Impedance mode). Clearing a TRISC

bit (= 0) will make the corresponding PORTC pin an

output (i.e., 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 11-5). The pins have Schmitt Trigger input

buffers. RC1 is normally configured by Configuration

bit, CCP2MX, as the default peripheral pin of the CCP2

module (default/erased state, CCP2MX = 1).

When enabling peripheral functions, care should be

taken in defining TRIS bits for each PORTC pin. Some

peripherals override the TRIS bit to make a pin an output,

while other peripherals override the TRIS bit to make a

pin an input. The user should 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 11-3:

INITIALIZING PORTC

Note:

On a Power-on Reset, these pins are

configured as digital inputs.

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

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