mb.c

99秒马表设计 开始时

#include <reg51.H> 

  

unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f, 

                               0x66,0x6d,0x7d,0x07, 

                               0x7f,0x6f,0x77,0x7c, 

                               0x39,0x5e,0x79,0x71,0x00}; 

unsigned char second; 

unsigned char keycnt; 

unsigned int tcnt; 

  

void main(void) 

{ 

  unsigned char i,j; 

  

  TMOD=0x02; 

  ET0=1; 

  EA=1; 

  second=0; 

  P0=dispcode[second/10]; 

  P2=dispcode[second%10]; 

  while(1) 

    { 

      if(P3^5==0) 

        { 

          for(i=20;i>0;i--) 

          for(j=248;j>0;j--); 

          if(P3^5==0) 

            { 

              keycnt++; 

              switch(keycnt) 

                { 

                  case 1: 

                    TH0=0x06; 

                    TL0=0x06; 

                    TR0=1; 

                    break; 

                  case 2: 

                    TR0=0; 

                    break; 

                  case 3: 

                    keycnt=0; 

                    second=0; 

                    P0=dispcode[second/10]; 

                    P2=dispcode[second%10]; 

                    break; 

                } 

              while(P3^5==0); 

            } 

        } 

    } 

} 

  

void t0(void) interrupt 1 using 0 

{ 

  tcnt++; 

  if(tcnt==400) 

    { 

      tcnt=0; 

      second++; 

      if(second==100) 

        { 

          second=0; 

        } 

      P0=dispcode[second/10]; 

      P2=dispcode[second%10]; 

    } 

}