dsjsbx.bak

51定时器常用例子包括测频率测脉宽产生波形

	#include"at89x52.h"
	#define uchar unsigned char
	#define uint  unsigned int
	sbit m=P1^0;
        

	void main()
         {  uchar l;
	    TMOD=0X02;
	    TR0=1;
	    TH0=(-65530)>>8;
	    TL0=-65530;

	     while(1)
	        {while(TF0==0);
		  TF0=0;l=l+1;
		  //TH0=0Xb0;
	          //TL0=0Xb0;
		  //if(l==2)
		  // {
		    m=!m;
		   // l=0;
		  //  }
		       
	         }
	  
          }