PIC16C54C-04I/P【PDF 12/194 页】IC MCU OTP 512X12 18DIP

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PIC18F2450/4450

2006 Microchip Technology Inc.

Advance Information

DS39760A-page 107

9.4

PORTD, TRISD and LATD

Registers

PORTD is an 8-bit wide, bidirectional port. The

corresponding data direction register is TRISD. Setting

a TRISD bit (= 1) will make the corresponding PORTD

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

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

will make the corresponding PORTD pin an output (i.e.,

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

The Data Latch register (LATD) is also memory

mapped. Read-modify-write operations on the LATD

PORTD.

All pins on PORTD are implemented with Schmitt

Trigger

input

buffers.

Each

individually

configurable as an input or output.

EXAMPLE 9-4:

INITIALIZING PORTD

Note:

PORTD is only available on 40/44-pin

devices.

Note:

On a Power-on Reset, these pins are

configured as digital inputs.

CLRF

PORTD

; Initialize PORTD by

; clearing output

; data latches

CLRF

LATD

; Alternate method

; to clear output

; data latches

MOVLW

0CFh

; Value used to

; initialize data

; direction

MOVWF

TRISD

; Set RD<3:0> as inputs

; RD<5:4> as outputs

; RD<7:6> as inputs

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