void Timer0_IRQHandler(void) interrupt 1             //8usÖжÏÒ»´Î
{

	P0 = cPwmDriveBuffer[Uln2803.cCount];				

   	++ Uln2803.cCount;

	if (-- cTickCount == 0)
	{
	    cTickCount  = 25;
	    bSystemTick = TRUE;
	}
}