Why putting a goto ISR at the ISR entry point and not the code.
Do you handle the interrupt correct?
 
Harry
> -----Oorspronkelijk bericht-----
> Van: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
> Namens Manu Abraham
> Verzonden: zaterdag 12 september 2009 1:08
> Aan: piclist@mit.edu
> Onderwerp: [PIC] RB0/INT behaving different than expected ?
> 
> 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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