Read input from ports and print it on the LEDs

Read input from PORTS and print it to the LEDs,

Code:

TITLE "READ SWITCHES AND OUTPUT"
list p= 16f877
include <p16f877.inc>
BANK0 macro
bcf STATUS,RP0
bcf STATUS,RP1
endm
BANK1 macro
bsf STATUS,RP0
bcf STATUS,RP1
endm
BANK2 macro
bcf STATUS,RP0
bsf STATUS,RP1
endm
BANK3 macro
bsf STATUS,RP0
bsf STATUS,RP1
endm

ORG 0 ;START ADDRESS
NOP
GOTO START ;PROGRAM START

ORG 0x20
START CALL INITP ;INITIALISE PORTS
REPEAT
MOVF PORTA,W ;READ PORT A
MOVWF PORTD ;OUTPUT DATA
GOTO REPEAT ;REPEAT FoREVER

;PORT INIT ROUTINE
INITP BANK1
MOVLW 06 ;MAKE PORT A DIGITAL
MOVWF ADCON1
MOVLW 0xFF
MOVWF TRISA ;MAKE A INPUT
CLRF TRISD ;MAKE PORT D OUTPUT
BANK0 ; BACK To BANK 0
RETURN
END

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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