
2010 Microchip Technology Inc.
DS39774D-page 143
PIC18F85J11 FAMILY
11.7
PORTF, LATF and TRISF Registers
PORTF is a 7-bit wide, bidirectional port. The corre-
sponding Data Direction and Output Latch registers are
TRISF and LATF. All pins on PORTF are implemented
with Schmitt Trigger input buffers. Each pin is individually
configurable as an input or output.
PORTF is multiplexed with analog peripheral functions.
Pins RF1 through RF6 may be used as comparator
inputs or outputs by setting the appropriate bits in the
CMCON register. To use RF<6:3> as digital inputs, it is
also necessary to turn off the comparators.
EXAMPLE 11-6:
INITIALIZING PORTF
Note 1: On device Resets, pins, RF<6:1>, are
configured as analog inputs and are read
as ‘0’.
2: To configure PORTF as digital I/O, turn off
comparators and set ADCON1 value.
CLRF
PORTF
; Initialize PORTF by
; clearing output
; data latches
CLRF
LATF
; Alternate method
; to clear output
; data latches
MOVLW
07h
;
MOVWF
CMCON
; Turn off comparators
MOVLW
0Fh;
MOVWF
ADCON1
; Set PORTF as digital I/O
MOVLW
0CEh
; Value used to
; initialize data
; direction
MOVWF
TRISF
; Set RF3:RF1 as inputs
; RF5:RF4 as outputs
; RF7:RF6 as inputs