shizhong.txt

单片机做时钟 利用keil uvision3 编程 双龙下载器

#include <AT89X51.H>    //******头文件*******//

unsigned char mg=0,ms=0,fg=0,bittime=0,bitdisplay=0;   //*定义变量*//

//********数码管段代码表(共阴且高位接a，低位接h笔段)**********//
unsigned char code Tab[]={0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,
                     0xFE,0xF6,0xEE,0x3E,0x9C,0x7A,0x9E,0x8E,0x00};

//*********定时中断服务程序**********//
void timer0 (void) interrupt 1 using 0
{
 TH0=0xE0; TL0=0xC0; 
 switch(bitdisplay)
 {
  case 0:P2=Tab[mg%10];P0=0xFE;break;
  case 1:P2=Tab[mg/10];P0=0xFD;break;
  case 2:P2=~(Tab[0])&0xFE;P0=0xFB;break;
  case 3:P2=Tab[ms%10];P0=0xF7;break;
  case 4:P2=Tab[ms/10];P0=0xEF;break;
  case 5:P2=~(Tab[0])&0xFE;P0=0xDF;break;
  case 6:P2=Tab[fg%10];P0=0xBF;break;
  case 7:P2=Tab[fg/10];P0=0x7F;break;
 }
 bitdisplay++;bittime++;
 if(bitdisplay==8){bitdisplay=0;}
}
void ys()
{unsigned char aaa,bbb;
 for(aaa=255;aaa>0;aaa--)
  for(bbb=0;bbb<255;bbb++);	}

//*********主程序**********//
void main(void)
{
 TMOD=0x01; TH0=0xE0;TL0=0xC0;
 EA=1; ET0=1; TR0=1;P1=0x00;
 while(1)
{
  if(bittime>250)
  {
  bittime=0;mg++;
  }
  if(mg==60)
  {
  mg=0;ms++;
  }
  if(ms==60)
  {
  ms=0;fg++;
  }
  if(fg==24)
  {
  fg=0;
   }
    if(P3==0xFE)
  { 
    ys();P3==0xFE;mg=mg+1; 
  }   
  if(P3==0xFD)
  { 
    ys();P3==0xFD;ms=ms+1; 
  }  
    if(P3==0xFB)
  { 
   ys();P3==0xFB;fg=fg+1; 
  }
if(mg<6&ms==0&fg==7)
  	if(mg%2==0)
  		{P1=0x08;}
  	else
  		{P1=0x00;}
else
	P1 = 0x00;
 }
}