99mabiao.c

本程序是一个实现秒表功能的设计程序,附带时钟功能.

#include <reg51.H>

sbit P3_5=P3^5;

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];

    }

}