元器件：
Atmel89c51
LM032L液晶屏
Button

仿真已经测试通过，大家使用只需要自己修改液晶的端口即可.

C程序代码:
/*电子时钟 1062液晶显示
  *  @
  *
  */

#include
#define uchar unsigned char
#define uint unsigned int
sbit LCD_EN=P3^4;
sbit LCD_RS=P3^5;
sbit s1=P3^0;
sbit s2=P3^1;
sbit s3=P3^2;
sbit rd=P3^7;
uchar count,s1num;
char miao,shi,fen;
uchar code table[]=" 2010-06-25 FIR";
uchar code table1[]="    20:25:00";

 


void delay(uint z)
{
 uint x,y;
 for(x=z;x>0;x--)
  for(y=110;y>0;y--);
}


void write_com(uchar com)
{
 LCD_RS=0;
 P1=com;
 delay(5);
 LCD_EN=1;
 delay(5);
 LCD_EN=0;
}


void write_data(uchar date)
{
 LCD_RS=1;
 P1=date;
 delay(5);
 LCD_EN=1;
 delay(5);
 LCD_EN=0;
}


void init()
{
 uchar num; 
 LCD_EN=0;
 write_com(0x38);
 write_com(0x0f);
 write_com(0x06);
 write_com(0x01);
 write_com(0x80);
 for(num=0;num<15;num++)
  {
   write_data(table[num]);
   delay(5);
  }
 write_com(0x80+0x40);
 for(num=0;num<12;num++)
  {
   write_data(table1[num]);
   delay(5);
  }
 TMOD=0x01;
 TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
 EA=1;
 ET0=1;
 TR0=1;
}

 

void write_sfm(uchar add,uchar date)
{
 uchar shi,ge;
 shi=date/10;
 ge=date%10;
 write_com(0x80+0x40+add);
 write_data(0x30+shi);
 write_data(0x30+ge);
}

void keyscan()
{
 rd=0;
 if(s1==0) 
 {
  delay(5);
  if(s1==0)
  { s1num++;
   while(!s1);
   if(s1num==1)
   {
    TR0=0;
    write_com(0x80+0x40+10);
    write_com(0x0f);
   }
 }
   if(s1num==2)
   {
    write_com(0x80+0x40+7);
   }
   if(s1num==3)
   {
    write_com(0x80+0x40+4);
   }
   if(s1num==4)
   {
    s1num=0;
    write_com(0x0c);
    TR0=1;
   }

    
  }
  if(s1num!=0)
  {
   if(s2==0)
   {
    delay(5);
    if(s2==0)
    {
     while(!s2);
     if(s1num==1)
     {
      miao++;
      if(miao==60)
       miao=0;
      write_sfm(10,miao);
      write_com(0x80+0x40+10);
      
      
     }
     if(s1num==2)
     {
      fen++;
      if(fen==60)
       fen=0;
      write_sfm(7,fen);
      write_com(0x80+0x40+7);
     }
     if(s1num==3)
     {
      shi++;
      if(shi==24)
       shi=0;
      write_sfm(4,shi);
      write_com(0x80+0x40+4);
     }
    }
   }
   if(s3==0)
   {
    delay(5);
    if(s3==0)
    {
     while(!s3);
     if(s1num==1)
     {
    
      miao--;
      if(miao==-1)
       miao=59;
      write_sfm(10,miao);
      write_com(0x80+0x40+10);
     }
     if(s1num==2)
     {
      fen--;
      if(fen==-1)
       fen=59;
      write_sfm(7,fen);
      write_com(0x80+0x40+7);
     }
     if(s1num==3)
     {
      shi--;
      if(shi==-1)
       shi=23;
      write_sfm(4,shi);
      write_com(0x80+0x40+4);
     }
    }
   }
  }
}


void main()
{
 init();
 while(1)
 {
  keyscan();
  
 }

}


void timer0() interrupt 1
{
 TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
 count++;
if(count==18)
  {
   count=0;
   miao++;
   if(miao==60)
   {
    miao=0;
    fen++;
    if(fen==60)
    {
     fen=0;
     shi++;
     if(shi==24)
     {
      shi=0;
     }
     write_sfm(4,shi);
    }
    write_sfm(7,fen);
   }
   write_sfm(10,miao);
   
  } 
}