clock.c

Mcs-51单片机接8155接数码管显示时间

#include <REGX51.H>
#include <absacc.h>
#define CTRL      XBYTE[0x0100]     /*控制字地址*/
#define PA        XBYTE[0x0101]     /*PA口地址*/
#define PB        XBYTE[0x0102]     /*PB口地址*/
#define PC        XBYTE[0x0103]     /*PC口地址*/
#define uchar unsigned char 
code uchar TAB[]={0x3f,0x06,0x5b,0x4f,0x66,0x6D,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar  sz[6];
unsigned int i,a,b,c,sww,ww,qw,bw,sw,gw;

void bin_hms(void)
{
  if(a>=46800)a=a-43200;
  sww=sz[0]=a/36000;
  ww=sz[1]=a/3600%10;
  qw=sz[2]=a%3600/600;
  bw=sz[3]=a%3600/60%10;
  sw=sz[4]=a%60/10;
  gw=sz[5]=a%60%10;
}

void delay(void)
{
  for(i=0;i<12;i++)
  {;}
}

void display(void)
{
  PA=0x00;
  PC=0xdf;
  bin_hms();
    for(b=0;b<6;b++)
	    {
		 PA=TAB[sz[b]];
		 delay();
		 if(PC==0xfe)break;
		 PA=0x00;
		 PC=PC<<7|PC>>1;
		}



}

t0_100ms() interrupt 1
{
  TL0=0xB0;
  TH0=0x3C;
  c++;
     if(c==20)	
	   {a++;c=0;}

}

main()
{

	CTRL=0x0d;
 
  a=0;
  c=0;
  TMOD=0x01;
  IE=0x82;
  TH0=0x3C;
  TL0=0xB0;
  TR0=1;
  while(1)
     {
	 display();
	 }

}