18F8680 datasheet(141/496 Pages) MICROCHIP

141 / 496 page

 2004 Microchip Technology Inc.

DS30491C-page 139

PIC18F6585/8585/6680/8680

10.6

PORTF, LATF and TRISF Registers

PORTF is an 8-bit wide, bidirectional port. The corre-

sponding data direction register is TRISF. Setting a

TRISF bit (= 1) will make the corresponding PORTF pin

an input (i.e., put the corresponding output driver in a

high-impedance mode). Clearing a TRISF bit (= 0) will

make the corresponding PORTF pin an output (i.e., put

the contents of the output latch on the selected pin).

Read-modify-write operations on the LATF register

read and write the latched output value for PORTF.

PORTF is multiplexed with several analog peripheral

functions, including the A/D converter inputs and

comparator inputs, outputs, and voltage reference.

EXAMPLE 10-6:

INITIALIZING PORTF

FIGURE 10-13:

PORTF RF1/AN6/C2OUT AND RF2/AN7/C1OUT PINS BLOCK DIAGRAM

Note 1: On a Power-on Reset, the RF6:RF0 pins

are configured as inputs and 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

0CFh

; Value used to

; initialize data

; direction

MOVWF

TRISF

; Set RF3:RF0 as inputs

; RF5:RF4 as outputs

; RF7:RF6 as inputs

Port/Comparator Select

Data Bus

WR LATF or

WR TRISF

Data Latch

TRIS Latch

RD TRISF

Comparator Data Out

VDD

VSS

RD PORTF

I/O pin

WR PORTF

RD LATF

Schmitt

Trigger

Note

I/O pins have diode protection to VDD and VSS.

Analog

Input

Mode

To A/D Converter

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