用51做一个0.00-99.9S的秒表 -

标题: 用51做一个0.00-99.9S的秒表 [打印本页]

作者: 51hhcc 时间: 2017-3-28 19:03
标题: 用51做一个0.00-99.9S的秒表
#include "reg52.h"    //此文件中定义了单片机的一些特殊功能寄存器
typedef unsigned int uint;    //对数据类型进行声明定义
typedef unsigned char uchar;

uchar datas[3]={0,0,0};
uchar code smgduan[18]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};//显示0~F的值

uint sec = 0;
uchar i = 0;
uint count = 0;
bit flag = 0;

void Timer0Init()
{
TMOD=0x01;//选择为定时器0 模式1，工作方式1，仅用TR0打开启动。
TH0=(-2500)>>8; //给定时器赋初值，定时1ms
TL0=(-2500)&0x00ff;
ET0=1;//打开定时器0中断允许
EA=1;//打开总中断
TR0=1;//打开定时器
}
void jisuan()
{
datas[0] = sec%10;
datas[1] = sec/10%10;
datas[2] = sec/100%10;
}
void main()
{
Timer0Init(); //定时器0初始化
while(1)
{
if(flag)
{
      sec ++;
         jisuan();
      flag = 0;
      if(sec == 999)
   {
   sec = 0;
   }
}
}
}
void Timer0() interrupt 1
{
TH0=(-2500)>>8; //给定时器赋初值，定时2.5ms
TL0=(-2500)&0x00ff;
P0 = 0x00;
P2 = i <<2;
if(i == 1)
   P0 = smgduan[datas[i]]|0x80;
else
   P0 = smgduan[datas[i]];
i ++;
if(i == 3)
   i = 0;
count ++;
if(count == 40)//0.1S
{
      count = 0;
      flag = 1;
}
}

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