[原創(chuàng)]時鐘設(shè)計用一個按鍵實現(xiàn)開啟關(guān)閉復(fù)位功能

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit key1=P3^3;
sbit key2=P3^4;
sbit key3=P3^5;
uchar t,a,b,c,flag;
uint temp;
uchar code table[]={0xc0,0xf9,0xa4,0xb0,
     0x99,0x92,0x82,0xf8,
     0x80,0x90};
void init();
void key_scan();
void delay(uint z)
{
 uint x,y;
  for(x=z;x>0;x--)
   for(y=110;y>0;y--); 
}
void display(uchar a, uchar b, uchar c);
void main()
{ 
 init();  
 while(1)
 {   
  a=temp/100;
  b=temp%100/10;
  c=temp%10;
  key_scan(); 
  display(a,b,c);
  
 }
}
void init()
{ 
 t=0;
 temp=0;
 P2=0x1f;
 P0=0xc0;
 TMOD=0X01;
 TH0=(65536-10000)/256;
 TL0=(65536-10000)%256;
 EA=1;
 ET0=1;
}
void display(uchar a,uchar b,uchar c)
{
 P2=0x7f;
 P0=table[a];
 delay(10);
 P2=0xbf;
 P0=table;
 delay(10);
 P2=0xdf;
 P0=table[c];
 delay(10);