Program A :

;************************************
; written by :	John Morton	*
; date : 21/07/97				*
; version : 1.0					*
; file saved as : LedOn			*
; for PIC54					*
; clock frequency : 3.82 MHz		*
;************************************

; PROGRAM FUNCTION :  To turn on an LED

 		list 	     	P=16C54
		include		"c:\pic\p16c5x.inc"

;============
; Declarations :  

		porta		equ	05

		org		1FF
		goto		Start
		org		0


;===========
; Subroutines : 


Init		clrf		porta		; resets Port A
		movlw		b'0000'	; RA0 : LED, RA1-3 : not connected
		tris		porta
		retlw		0

;=============
; Program Start : 

Start
		call		Init		; sets up inputs and outputs
Main
		bsf		porta, 0	; turns on LED
		goto		Main		; loops back to Main

END