51单片机计时程序与仿真电路图程序

ID:849631 · 发表于 2020-11-26 15:22

#include<reg51.h>
unsigned char  seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff};
//共阳极断码表
unsigned char num=0,count=0;
sbit K0=P3^2;
sbit K1=P3^3;
int i=0;
void dis_play();
void intittimer();

void main()
{
intittimer();
while(1)
{
   dis_play();
}
}

void intittimer()
{
  TMOD=0x01;
  TH0=(65536-50000)/256;  //50ms=50000us
  TL0=(65536-50000)%256;
  ET0=1;
  EA=1;
  TR0=0;
  IT0=1;
  EX0=1;
  IT1=1;
  EX1=1;
}

void dis_play()
{
  if(num==100)
  {
num=0;
  }
  P2=seg[num/10];
  P1=seg[num%10];
}
void a() interrupt 0
{
TR0=~TR0;
num=num;
}
void b()interrupt 2
{
  TR0=0;
  num=0;
}

void timer_isr()  interrupt 1
{
  TH0=(65536-50000)/256;  //50ms=50000us  256=2^8  初值>>8
  TL0=(65536-50000)%256;
  count++;
  if(count==20)
  {
   num++;
   count=0;
  }
}

秒表.zip (36.84 KB, 下载次数: 10)

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