Datasheet

 2011 Microchip Technology Inc. DS39762F-page 151
PIC18F97J60 FAMILY
11.4 PORTC, TRISC and
LATC Registers
PORTC is an 8-bit wide, bidirectional port; it is fully
implemented on all devices. The corresponding 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).
Only PORTC pins, RC2 through RC7, are digital only
pins and can tolerate input voltages up to 5.5V.
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.
PORTC is multiplexed with several peripheral functions
(Table 11-7). The pins have Schmitt Trigger input
buffers. RC1 is normally configured by Configuration
bit, CCP2MX, as the default peripheral pin for the
ECCP2 module and Enhanced PWM output, P2A
(default 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.
EXAMPLE 11-3: INITIALIZING PORTC
Note: These pins are configured as digital inputs
on any device Reset.
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