/*****************************************************************************
* 频率计程序
* 作者 :
* Email:9902013327@163.com
* 单片机采用AT89S52，晶振频率为：12.00MHz。
/******************************************************************************/
#include <AT89X51.H>
unsigned char code SEG_Tab[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,
0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E};//数字代码段
unsigned char code DS_Tab[]={0x01,0x02,0x04,0x08};//位选代码
unsigned char display_buf[]={0,0,0,0};//要显示的数值
unsigned char digit;
sfr SEG_OUT = 0x80;
sfr DS_OUT = 0xa0;
unsigned char temp[4];
unsigned char T0count;
unsigned char timecount;
unsigned long x;
bit flag; //定义变量
void main(void)
{
unsigned char i;
TMOD=0x15;
TH0=0;
TL0=0;
TH1=(65536-4000)/256;
TL1=(65536-4000)%256;
TR1=1;
TR0=1;
ET0=1;
ET1=1;
EA=1;//开中断
while(1)
{
if(flag==1)
{
flag=0;
x=T0count*65536+TH0*256+TL0;//频率转换为数值
for(i=0;i<4;i++)
{
temp[i]=0;
}
i=0;
while(x/10)//数值赋给那一位
{
temp[i]=x%10;
x=x/10;
i++;
}
temp[i]=x;
for(i=0;i<4;i++)
{
display_buf[i]=temp[i];
}
timecount=0;
T0count=0;
TH0=0;
TL0=0;
TR0=1;//把T0计数器清0
}
}
}
void time0(void) interrupt 1 using 1
{
T0count++;
}
void t1(void) interrupt 3 using 0
{
TH1=(65536-4000)/256;//产生一秒的定时
TL1=(65536-4000)%256;
timecount++;
if(timecount==250)
{
TR0=0;
timecount=0;
flag=1;
}
SEG_OUT = SEG_Tab[display_buf[digit]];//P0口的数据显示
DS_OUT = DS_Tab[digit];//P2口的位选
if(++digit > 3)
digit = 0;
}
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