Hi,


I have the following code. When i do power up, all i do see is that
the LED on RA.1 is lit up after ~250mS
What i had been expecting was an edge on RA.1 to light up the LED for
~ 250mS. ie the code looping within main and a subsequent interrupt
causes the LED to be cleared (switched ON) and with the return from
the ISR back to the main loop with a delay of 250 mS, the LED is set
(switched OFF)

I can't seem to find what i am doing wrong. Can someone please point
out what i am possibly doing wrong ?

Thanks,


	PROCESSOR	16f72
	#include "p16f72.inc"
	
	__CONFIG _CP_OFF & _WDT_OFF & _PWRTE_ON & _HS_OSC

loopus_a	EQU 0x2d

loopms_a	EQU 0x2e
loopms_b	EQU 0x2f
loopms_c	EQU 0x2f


LEDPORT	equ	PORTA
LEDBIT	equ	1

	org	0x0
	goto	init

	org	0x4
	goto	isr

	#include "delays.inc"

init
	banksel	TRISA
	movlw	0x06
	movwf	ADCON1
	movlw	0x00			; Port A output
	movwf	TRISA

	movlw	0x01			; RB.0 int
	movwf	TRISB

	banksel	OPTION_REG
	bcf	OPTION_REG, INTEDG	; falling edge int
	bsf	OPTION_REG, NOT_RBPU	; disable pullup
	bsf	INTCON, INTE		; enable RB.0 int
	bsf	INTCON, GIE		; global int

main
	banksel	LEDPORT
	movlw	0xff
	call	delay_ms
	bsf	LEDPORT, LEDBIT		; LED off
	movlw	0xff
	call	delay_ms
	goto	main

isr
	banksel	LEDPORT
	bcf	INTCON, INTF
	bcf	LEDPORT, LEDBIT
	retfie

	END
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