Microchip Technology DV164136 Data Sheet

DS39646C-page 140

© 2008 Microchip Technology Inc.

PORTC is an 8-bit wide, bidirectional port. The corre-
sponding Data Direction register is TRISC. Setting 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
register read and write the latched output value for
PORTC. 

PORTC is multiplexed with several peripheral
functions. All port pins have Schmitt Trigger input
buffers. RC1 is normally configured by Configuration
bit, CCP2MX, as the default peripheral pin of the
ECCP2 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 the correct TRIS bit settings.

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.

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