#include <p18F4580.h>
#define mybit PORTBbits.RB7
void chk_isr(void);
void INT1_ISR(void);
#pragma code My_HiPrio_Int =0x0008	
void My_HiPrio_Int (void)
{
_asm
GOTO chk_isr
_endasm
}
#pragma code
#pragma interrupt chk_isr 	
					
void chk_isr (void)
{
if (INTCON3bits.INT1IF==1)	
INT1_ISR( );	
	}
void main(void)
  {
   	TRISBbits.TRISB7=0;	
	TRISBbits.TRISB1=1; 	
	INTCON3bits.INT1IF=0;	
	INTCON3bits.INT1IE=1;	
	INTCON2bits.INTEDG1=0;
  }
void INT1_ISR(void)
  {
    mybit=~mybit;
    INTCON3bits.INT1IF=0;		
  }