DM163006 datasheet(124/320 Pages) MICROCHIP

124 / 320 page

PIC18C601/801

DS39541A-page 124

Advance Information

 2001 Microchip Technology Inc.

9.9

PORTJ, LATJ, and TRISJ

Registers

PORTJ is an 8-bit wide, bi-directional I/O port. The cor-

responding 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 is multiplexed with de-multiplexed system data

bus D7:D0, when device is configured in 8-bit execution

mode. Register MEMCON configures PORTJ as I/O or

system bus pins.

EXAMPLE 9-10:

INITIALIZING PORTJ

FIGURE 9-19:

PORTJ BLOCK DIAGRAM

IN I/O MODE

Note:

PORTJ is available only on PIC18C801

devices.

Note:

On Power-on Reset, PORTJ defaults to

system bus signals.

CLRF

PORTJ

; Initialize PORTJ by

; clearing output

; data latches

CLRF

LATJ

; Alternate method

; to clear output

; data latches

MOVLW

0CFh

; 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

RD PORTJ

Data Latch

TRIS Latch

RD TRISJ

Schmitt

Trigger

Input

Buffer

I/O pin(1)

RD LATJ

PORTJ

Note 1: I/O pins have diode protection to VDD and VSS.

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