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
* @
*
*/

#includereg51.h

#define uchar unsigned char

#define uint unsigned intsbit 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;num15;num++){write_data(table[num]);delay(5);}

write_com(0x80+0x40);for(num=0;num12;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);} }