#include<reg52.h>
unsigned int i=0;
sbit P36=P3^6;
unsigned char j;
unsigned int kop;
unsigned char a[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char b[8]={0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
void delaym(unsigned int t)
{ unsigned char p;
while(t--)
{
for(p=0; p<125; p++);
}
}
void main()
{
EA = 1;
TH0=0x00;
TL0=0x00;
ET0=1;
ET1=1;
TMOD = 0x15;// 打开定时器和计数器T0，因此矩形脉冲输入端接P3.4
TH1=0x3C; //50ms
TL1=0xB0;
TR0 = 1;
TR1 = 1;
while(1)
{
for(j=0;j<3;j++) //显示个数
{
P0=b[j];
P2=j;
delaym(2);
}
}
}
timer3() interrupt 3 //定时器中断时间到,就读取计数器值
{ TH1=0X3C;
TL1=0XB0;
i++;
if(i==20) //1s才进行技术脉冲值显示，即每秒更新一次速度
{
kop=TH0;//计数器计入脉冲，每来一个矩形脉冲计数值加1
kop=kop<<8;
kop=kop+TL0;
b[2]=a[kop/100]; //显示计数器的值即实际测得速度
b[1]=a[kop%100/10];
b[0]=a[kop%100%10];
i=0;
TH0=0;//计数器速度获取后清零，进行下次获取
TL0=0;
}
}
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