51单片机倒计时程序

ID:1131470 · 发表于 2024-9-6 22:56

#include<reg52.h>
#define uchar unsigned char
#define uint  unsignede int
sbit dula=P2^6;
sbit wela=P2^7;
char code tabl[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x76,0x79,0x38,0x3f,0};
uchar temp,b,s,g,tab;
void delay(uchar x)
  {uchar i,j;
  for(i=0;i<x;i++)
   for(j=0;j<110;j++);}

void int0()interrupt 0
{TR0=1;
//tab=100;
  }
void initil()
  {dula=0;
   wela=0;
   tab=101;
TMOD=0X01;
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
   EA=1;
   ET0=1;
   EX0=1;
//TR0=1;
}
void display(uchar b,uchar s,uchar g)
  { dula=1;
      P0=tabl[b];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfe;
      wela=0;
      delay(1);

      dula=1;
      P0=tabl[s];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfd;
      wela=0;
      delay(1);

      dula=1;
      P0=tabl[g];
      dula=0;
      P0=0xff;
      wela=1;
      P0=0xfb;
      wela=0;
      delay(1);
}

void timer0()interrupt 1
{TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
  temp++;

               }
void  main()
  {
initil();
   while(1)
{
   if (temp==8)

   {  temp=0;
      tab--;
      if (tab==-1)
      {
         tab=0;
         TR0=0;

   }


      b=tab/100;
      s=tab%100/10;
      g=tab%10;}
      display(b,s,g);
}}

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