單片機雙數(shù)碼管1分鐘計時新手入門

ID:773907 · 發(fā)表于 2020-6-9 14:00

#include<reg51.h>
unsigned char code c[]={0xc0,0xf9,0xA4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char code cd[]={0x90,0x80,0xf8,0x82,0x92,0x99,0xb0,0xA4,0xf9,0xc0};
unsigned char second;
unsigned  char tcount;

void  main()
{
TMOD=0x01;
      TH0=(65536-50000)/256;
      TL0=(65536-50000)%256;
ET0=1;
      EA=1;
      TR0=1;
      tcount=0;
      second=0;
      P0=c[second/10];//0
      P2=c[second%10];//0
      while(1)//50ms
      {
         if(TF0==1)          //開啟查詢
         {
                  tcount++;
         if(tcount==20)//1s
      {
            tcount=0;
            second++;//1
               if(second==60)
                  {
                     second=0;
                     }
            P0=c[second/10];
         P2=c[second%10];
         }
         TF0=0; //手動置0
         TH0=(65336-50000)/256;
         TL0=(65336-50000)%256;
         }
      }
}
void t0(void) interrupt 1 using 0
{

}

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