PIC18LC658T-ESLASHCL datasheet(104/366 Pages) MICROCHIP

104 / 366 page

PIC18CXX8

DS30475A-page 104

Advanced Information

 2000 Microchip Technology Inc.

8.8

PORTH, LATH, and TRISH Registers

PORTH is a 5-bit wide, bi-directional port available only

on the PIC18C858 devices. The corresponding Data

Direction register is TRISH. Setting a TRISH bit (=1)

will make the corresponding PORTH pin an input (i.e.,

put the corresponding output driver in a hi-impedance

mode). Clearing a TRISH bit (=0) will make the corre-

sponding PORTH pin an output (i.e., put the contents

of the output latch on the selected pin).

Read-modify-write operations on the LATH register

read and write the latched output value for PORTH.

Pins RH0-RH3 on the PIC18C858 are bi-directional I/O

pins with ST input buffers. Pins RH4-RH7 on all devices

are multiplexed with A/D converter inputs.

FIGURE 8-16: RH3:RH0 PINS BLOCK

DIAGRAM

EXAMPLE 8-8:

INITIALIZING PORTH

FIGURE 8-17: RH7:RH4 PINS BLOCK

DIAGRAM

Note:

This port is available on PIC18C858.

Note:

On a Power-on Reset, the RH7:RH4 pins

are configured as inputs and read as ’0’.

Data Bus

WR LATH

WR TRISH

Data Latch

TRIS Latch

RD TRISH

Schmitt

Trigger

VDD

VSS

PORTH

I/O Pin

WR PORTH

RD LATH

Note:

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

CLRF

PORTH

; Initialize PORTH by

; clearing output

; data latches

CLRF

LATH

; Alternate method

; to clear output

; data latches

MOVLW

0x0F

;

MOVWF

ADCON1

;

MOVLW

0xCF

; Value used to

; initialize data

; direction

MOVWF

TRISH

; Set RH3:RH0 as inputs

; RH5:RH4 as outputs

; RH7:RH6 as inputs

Data

Bus

WR LATH

WR TRISH

Data Latch

TRIS Latch

RD TRISH

RD PORTH

VSS

VDD

I/O Pin

Analog

Input

Mode

Input

Buffer

To A/D Converter

RD LATH

WR PORTH

Note:

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

PIC18LC658T-E/CL Datasheet(PDF) 104 Page - Microchip Technology

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