void buzzer_timer(void) interrupt 3 
{
    T1_Start();  // start timer again

    	if (++ticks10 == 250)
	{ 
	    if (++ticks == 40){
	    P2 &= ~0x0C;
	    ticks = 0;
	    SCON &= 0x50;
	    LCD_Flag = 1;
	    TR1 = 0;
			}
	  ticks10 = 0;
	  }
	return;
}