PIC18LC658T-ESLASHCL datasheet(106/366 Pages) MICROCHIP

106 / 366 page

PIC18CXX8

DS30475A-page 106

Advanced Information

 2000 Microchip Technology Inc.

8.9

PORTJ, LATJ, and TRISJ Registers

PORTJ is an 8-bit wide, bi-directional port available

only on the PIC18C858 devices. The corresponding

Data Direction register is TRISJ. Setting a TRISJ bit

(=1) will make the corresponding PORTJ pin an input

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

hi-impedance mode). Clearing a TRISJ bit (=0) will

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

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

Read-modify-write operations on the LATJ register

read and write the latched output value for PORTJ.

PORTJ on the PIC18C858 is an 8-bit port with Schmitt

Trigger input buffers. Each pin is individually config-

urable as an input or output.

EXAMPLE 8-9:

INITIALIZING PORTJ

FIGURE 8-18: PORTJ BLOCK DIAGRAM

Note:

This port is available on PIC18C858.

CLRF

PORTJ

; Initialize PORTJ by

; clearing output

; data latches

CLRF

LATJ

; Alternate method

; to clear output

; data latches

MOVLW

0xCF

; Value used to

; initialize data

; direction

MOVWF

TRISJ

; Set RJ3:RJ0 as inputs

; RJ5:RJ4 as outputs

; RJ7:RJ6 as inputs

Data Bus

WR LATJ

WR TRISJ

Data Latch

TRIS Latch

RD TRISJ

VDD

VSS

RD PORTJ

I/O Pin

WR PORTJ

RD LATJ

Schmitt

Trigger

Note:

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

PIC18LC658T-E/CL Datasheet(PDF) 106 Page - Microchip Technology

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