ECCP1CON=0x02;	
    T3CON=0x42;		
    TRISDbits.TRISD4=0; 	
    TRISCbits.TRISC0=1; 	
    ECCPR1L=20;			
    ECCPR1H=0;			
    while(1)
    {
      TMR3H=0;
      TMR3L=0;
      PIR2bits.ECCP1IF=0;			
      T3CONbits.TMR3ON=1;			
      while(PIR2bits.ECCP1IF==0);	
      
      T3CONbits.TMR3ON=0;			
    }