PIC18F2480/2580/4480/4580
11.3 PORTC, TRISC and LATC
Registers
Note:
On a Power-on Reset, these pins are
configured as digital inputs.
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 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
CLRF
PORTC
; Initialize PORTC by
; clearing output
; data latches
The Output Latch register (LATC) is also memory
mapped. Read-modify-write operations on the LATC
register read and write the latched output value for
PORTC.
CLRF
LATC
; Alternate method
; to clear output
; data latches
PORTC is multiplexed with several peripheral functions
(Table 11-5). The pins have Schmitt Trigger input
buffers.
MOVLW
MOVWF
0CFh
; Value used to
; initialize data
; direction
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> as inputs
TRISC
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.
© 2009 Microchip Technology Inc.
DS39637D-page 141
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