1574timer.c

MXIC旺宏液晶电视芯片MX88V44的源码

#include "..\inc\public2.h"

int		T0_0Interval;
BYTE	T0_0Service;		//Timer 0 service Var.

/**--------------------------------------------------------------------------
* Name          void    interrupt	Timer1C_NewServiceRoutine()
*               char	bautrate_LSB
*
* Description	This is a timer interrupt. It will entry when every 20ms.
*				And will check Parse flag status.
*
* Flow Chart
*
* Return
*
* DATE          Author          Description
* ===========================================================================
* 2003-02-20	KM Ho			This is first time implement
**/
void Timer0(void) interrupt 1 using 3
{
	TR0=0;							//STOP COUNT Timer0

	if (T0_0Service)				//is Timer 0 service flag setting?
	{
		T0_0Interval--;				// counter
		if (T0_0Interval < 0)		// is timer out?
			T0_0Service = 0;		// turn off the service flag
	}

	TH0=0x9E;						//Timer0 working in Mode 1 and set 20m sec.
	TL0=0x58;						//Working Cry=14.318MHz 1/14.318M * 12 = 0.8 us
									//20ms = 0.8 * 25000
									//	TH0 = (65536 - 25000) / 256 = 0x9E
									//	TL0 = (65536 - 25000) % 256 = 0x58
	TF0=0;
	TR0=1;							//Start count Timer0
}