#include <p18F4580.h>
#define mybit PORTBbits.RB7
void chk_isr(void);
void INT0_ISR(void);
#pragma interrupt chk_isr
void chk_isr (void)
{
if (INTCONbits.INT0IF==1)	
INT0_ISR( );			
}
#pragma code My_HiPrio_Int=0x08	
					
void My_HiPrio_Int (void)
{
_asm
GOTO chk_isr
_endasm
}
#pragma code
void main(void)
  {
   	TRISBbits.TRISB7=0;	
	TRISBbits.TRISB0=1;	
	TRISC = 0xFF;		
	TRISD = 0;			
	INTCONbits.INT0IF=0; 	
	INTCONbits.INT0IE=1;	
	INTCONbits.GIE=1;	
   while(1)	
    {
	PORTD=PORTC;
    }
  }
void INT0_ISR(void)
  {
    mybit=~mybit;
    INTCONbits.INT0IF=0;		
  }