程序9
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
#define hi 0x3c
#define lo 0xb0   //50ms
unsigned char led_no,array_no=8,mask=0xfe,f[10],int_flag;
unsigned int tf0;
unsigned char code ledk[14]
       ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
        0x7d,0x07,0x7f,0x6f,0xf3,0x79,0x3e,0x31};//p10,E11,U12,r13
unsigned long t,time _at_ 0x30,time1 _at_ 0x40;
sbit P37=P3^7;sbit clk=P0^7;sbit sda=P0^6;               //74LS164
void delay(unsigned int n)
{ unsigned int i,j;
  for(i=0;i<n;i++)
     for(j=0;j<n;j++)
       ;}
void shift(unsigned char dx)
{static unsigned char d;
   unsigned char j=0;
    d=dx;
   	while(j<8)
	{if((d&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   d<<=1;j++;}  }


void hextodec(long xx)
 {unsigned  char B;
 B=xx/1000000000;  f[0]=B;
xx=xx%1000000000;
 B=xx/100000000;   f[1]=B;
xx=xx%100000000;
 B=xx/10000000;    f[2]=B;
xx=xx%10000000;
 B=xx/1000000;     f[3]=B;
xx=xx%1000000;
 B=xx/100000;      f[4]=B;
xx=xx%100000;
 B=xx/10000;       f[5]=B;
xx=xx%10000;
 B=xx/1000;        f[6]=B;
xx=xx%1000;
 B=xx/100;         f[7]=B;
xx=xx%100;
 B=xx/10;          f[8]=B;
xx=xx%10;
 B=xx;             f[9]=B;}
void  int0() interrupt 0
{ int_flag++;
  if(int_flag%2==1)TR1=1;
  if(int_flag%2==0)TR1=0; }
void t1() interrupt 3
{TH1=hi;TL1=lo;tf0++;}
 void out()
 {time=50*(long)tf0;
  time1=(long)((TH1*256+TL1)-(hi*256+lo))*50/(long)(0x10000-(hi*256+lo));
  t=time+time1;hextodec(t);
  if(f[4]!=0){f[5]=0;f[6]=12;f[7]=11;f[8]=13;}
  led_no++;if(led_no>3)led_no=0;
  array_no--;if(array_no<5)array_no=8;
  if(led_no==2)shift(ledk[f[array_no]]|0x80);
      else shift(ledk[f[array_no]]);
  mask=_crol_(mask,1);if(mask==0xef)mask=0xfe;
   P2=mask;} 
void main(void)
{TMOD=0x10;TH1=hi;TL1=lo;ET1=1;EX0=1;IT0=1;EA=1;int_flag=0;
 while(1)
  {out();delay(2);}  }