jieshoul.c

本人学习单片机一年多时间厚参加全国电子设计大赛的程序以及赛前练习的程序。

#include<AT892051.H>

unsigned char a;
unsigned char code tab[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

void delay(void);   //1ms
void delay1(void);   //1.2ms

void Int0(void) interrupt 0
{unsigned int j;
EA=0;
a=0;
delay1();
 for(j=0;j<8;j++)
 {a=a<<1;
  if(P3_2==1)
   a=a+1;
  delay();
  }
EA=1;
IE0=0;
}

main()
{EA=1;
 EX0=1;
 IT0=1;
 for(;;)
 {P3_3=1;P3_0=0;
  P1=tab[a/100];
  delay();
  P3_0=1;P3_1=0;
  P1=tab[(a/10)%10];
  delay();
  P3_1=1;P3_3=0;
  P1=tab[a%10];
  delay();
  }
}

void delay(void)
{unsigned int i;
 for(i=0;i<124;i++)
  ;
 }

void delay1(void)
{unsigned int k;
 for(k=0;k<144;k++)
  ;
 }