buzz.c

51单片机实验例程

/*********************************************************************************************************
**
**                                  (c) Copyright 2004-2006
**                                    All Rights Reserved
**
**
**                                    版权所有：朗顿科技
**                                   http://www.ldmcu.com
**
********************************************************************************************************/
#include <reg52.h>

sbit buzz = P3^5;

void T0_irq(void) interrupt 1 using 1
{
	TH0 = -(300/256);
	TL0 =- (300%256);

	buzz = ~buzz;
}

main()
{
  	TMOD = 0x01;
	TH0 = -(1000/256);
	TL0 =- (1000%256);
	EA = 1;
	ET0 = 1;
	TR0 = 1;

	for(;;){

	}
}