list p=16f628
		#include<p16f628.inc>
		__CONFIG  _MCLRE_ON & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
		ERRORLEVEL   -302
		cblock	0x20
			temp 
			temp_s      
  		endc
;******************************************************************
	org 0x00
	goto main
;***********************************INTERRUPT LOOP*****************
	org 0X04
inter:
		movwf 	temp
		swapf 	STATUS,w
		clrf  	STATUS
		movwf	temp_s
		btfsc	PORTB,0x00
		goto	loop1
loop2:
		movlw b'00000101'
		movwf	PORTA
		btfsc	PORTB,0x05
		goto	loop2
		goto	loop_x
		
loop1:		
		movlw 	b'10001000'
		movwf 	PORTA
		btfsc 	PORTB,0x00
		goto  	loop1
loop_x
		bcf   	INTCON,0x01
		bcf	  	INTCON,0x00
		swapf 	temp_s,w
		movwf 	STATUS
		swapf 	temp,w
		retfie

main:
		bsf		INTCON,0x07			;Globel interrupt enable(we are using interr.)
		bsf 	INTCON,0x04	
		bsf		INTCON,0x03			;RB4-RB7 interrupt on change is enabled/ in other words these pins will also work as
								;interrupts and interrupt will occur every time any of these pin changes state
								; i.e.:HIGH to LOW or LOW to HIGH, we can not set it to be on eather one state change  		
		bcf 	INTCON, 0x01		
		bcf		INTCON,	0x00			;Clear RB4-RB7 interrupt flag so, that another interr. can occur.

;**********************************SET UP THE PORTS *****************
		bsf		STATUS,RP0			;switch to BANK 1
		movlw 	b'00100001'	
		movwf 	TRISB				;set RB6 & RB5 as input
		movlw	b'00000000'
		movwf 	TRISA				;setPORT A all output
		bcf 	STATUS,RP0			;back to BANK  0
		movlw 	0x07				;turn comparators off, so HIGH will be simple
								; HIGH rather than +5V (compared to supply) so with the LOW
		movwf 	CMCON				

Loop:

		movlw 	b'00001001'		
		movwf 	PORTA				;set pin 0 of port a HIGH
		goto 	Loop
		END