急需电子时钟的设计，利用单片机AT89C52、时钟芯片DS1302、1602液晶显示器来控制的，要有c程序。

#include<reg52.h>

#include<define.h>

void delay(uint z)

{

uint x,y;

for(x=z;x>0;x--)

for(y=110;y>0;y--);

}

void didi()

{

beep=0;

delay(50);

beep=1;

delay(100);

beep=0;

delay(50);

beep=1;

}

void write_com(uchar com)

{

rs=0;

lcden=0;

P0=com;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

void write_date(uchar date)

{

rs=1;

lcden=0;

P0=date;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

void init()

{

uchar num;

EA=1;

EX0=1;

IT0=1;

dula=0;

wela=0;

lcden=0;

// set_time();

set_alarm(14,13,10);

write_ds(0x0B,0x26);

read_ds(0x0c);

// fen=59;

// miao=53;

// shi=23;

write_com(0x38);

write_com(0x0c);

write_com(0x06);

write_com(0x01);

write_com(0x80);

for(num=0;num<15;num++)

{

write_date(table[num]);

delay(5);

}

write_com(0x80+0x40);

for(num=0;num<12;num++)

{

write_date(table1[num]);

delay(5);

}

}

void write_sfm(uchar add,uchar date)

{

uchar shi,ge;

shi=date/10;

ge=date%10;

write_com(0x80+0x40+add);

write_date(0x30+shi);

write_date(0x30+ge);

}

void keyscan()

{

rd=0;

if(flag1==1)

{

if(s2==0)

{

delay(5);

if(s2==0)

{

while(!s2);

flag1=0;

}

}

if(s3==0)

{

delay(5);

if(s3==0)

{

while(!s3);

flag1=0;

}

}

}

if(s1==0)

{

delay(5);

if(s1==0)

{ s1num++;

flag=1;

flag1=0;

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);

flag=0;

write_ds(0,miao);

write_ds(2,fen);

write_ds(4,shi);

}

}

if(s1num!=0)

{

if(s2==0)

{

delay(1);

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(1);

if(s3==0)

{

while(!s3);

if(s1num==1)

{

/* if(miao==0)

{

miao=59;

write_sfm(10,miao);

write_com(0x80+0x40+10);

}*/

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 write_ds(uchar add,uchar date)

{

dscs=0;

dsas=1;

dsds=1;

dsrw=1;

P0=add;

dsas=0;

dsrw=0;

P0=date;

dsrw=1;

dsas=1;

dscs=1;

}

uchar read_ds(uchar add)

{

uchar ds_date;

dsas=1;

dsds=1;

dsrw=1;

dscs=0;

P0=add;

dsas=0;

dsds=0;

P0=0xff;

ds_date=P0;

dsds=1;

dsas=1;

dscs=1;

return ds_date;

}

void set_time()

{

write_ds(4,10);

write_ds(2,32);

}

void set_alarm(uchar ashi,uchar afen,uchar amiao)

{

write_ds(1,amiao);

write_ds(3,afen);

write_ds(5,ashi);

}

void main()

{

init();

while(1)

{

keyscan();

if(flag1==1)

didi();

if(flag==0)

{

miao=read_ds(0);

fen=read_ds(2);

shi=read_ds(4);

write_sfm(10,miao);

write_sfm(7,fen);

write_sfm(4,shi);

}

}

}

void exter() interrupt 0

{ uchar c;

flag1=1;

c=read_ds(0x0c);

}