单片机C语言电子钟显示年月日星期及时间(带注释)

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]=" 2011-12-30 SAT";
uchar code table1[]=" 23:59:55 ";
uchar code week1[][3]={"MON","TUE","WEN","THU","FRI","SAT","SUN"};
fen++;//分加
if(fen==60)
{
fen=0;
shi++;
if(shi==24)
{
shi=0;
day++;
a++;
weekday(a);
//时加
}
write_sfm(3,shi);
write_ymd(9,day);
if(day==31)
{
day=0x01;
write_ymd(9,day);
}
if(dnum==2)
{
fen++;
if(fen==60)fen=0;
write_sfm(6,fen);
write_com(0x80+0x40+7);
}
if(dnum==3)
{
shi++;
if(shi==24)
{
shi=0;
}
write_sfm(3,shi);
write_com(0x80+0x40+4);
write_com(0x80+0x40+add);//指向要写的地址
write_date(0x30+shi);//0x30代表的数字是0，+shi表示shi的数字
write_date(0x30+ge);//ge的数字
}
void write_ymd(uchar add,uchar date)
{
uchar shi,ge;
shi=date/10;
ge=date%10;
write_com(0x80+add);//指向要写的地址
write_date(0x30+shi);//0x30代表的数字是0，+shi表示shi的数字
write_date(0x30+ge);//ge的数字
}
void unit()
{
uchar num;
en=0;
{
write_date(table[num]);
delay(20);
}
write_com(0x80+0x40);
for(num=0;num<16;num++)//第二行显示table1数组
{
write_date(table1[num]);
delay(20);
}
TMOD=0X01;
TH0=(65536-50000)/256;//开启中断
}
if(dnum==6)
{
year++;
write_ymd(3,year%100);
write_com(0x80+4);
}
}
}
if(d3==0)//减数据
{
delay(10);
if(d3==0)
{
while(!d3);
if(dnum==1)
{
miao--;
if(miao==-1)miao=59;
write_sfm(9,miao);
sbit d4=P3^4;
void delay(uchar z)//延时
{
uint x,y;
for(x=110;x>0;x--)
for(y=z;z>0;z--);
}
void write_com(uchar com) //写指令
{
rs=0;
rw=0;
en=0;
P0=com;
delay(5);
en=1;
month++;
write_ymd(6,month);
if(month==13)
{
month=0x01;
write_ymd(6,month);
year++;
write_ymd(3,year);
}
}
}
write_sfm(6,fen);
}
write_sfm(9,miao);
}
}
void change()
write_com(0x80+0x40+10);
}
if(dnum==2)
{
fen--;
if(fen==-1)fen=59;
write_sfm(6,fen);
write_com(0x80+0x40+7);
}
if(dnum==3)
{
shi--;
if(shi==-1)shi=23;
write_sfm(3,shi);
{
d4=0;
if(d1==0)//移光标
{
delay(10);
if(d1==0)
{
while(!d1);
dnum++;
if(dnum==1)
{
TR0=0;
write_com(0x0f);
write_com(0x80+0x40+10);
}
if(dnum==2)
{
write_com(0x80+0x40+7);
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++;
}
}
if(dnum==4)
{
day++;
a++;
weekday(a);
if(day==31)day=1;
write_ymd(9,day);
write_com(0x80+10);
}
if(dnum==5)
{
month++;
if(month==13)month=1;
write_ymd(6,month);
write_com(0x80+7);
delay(5);
en=0;
}
void write_date(uchar date)//写数据
{
rs=1;
rw=0;
en=0;
P0=date;
delay(5);
en=1;
delay(5);
en=0;
}
void write_weekday (uchar a)
{
uchar x;
write_com(0x80+13);
/*uchar code week2[]="TUE";
uchar code week3[]="WEN";
uchar code week4[]="THU";
uchar code week5[]="FRI";
uchar code week6[]="SAT";
uchar code week7[]="SUN"; */
write_com(0x80+0x40+4);
}
if(dnum==4)
{
day--;
a--;
weekday(a);
if(day==0)day=30;
write_ymd(9,day);
write_com(0x80+10);
}
if(dnum==5)
{
month--;
if(month==0)month=12;
}
if(dnum==3)
{
write_com(0x80+0x40+4);
}
if(dnum==4)
{
writf(dnum==5)
{
write_com(0x80+7);
}
if(dnum==6)
{
write_com(0x80+4);
}
if(dnum==7)
{
dnum=0;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
shi=23;
fen=59;
miao=55;
year=11;
month=12;
day=30;
}
void jishu()//计数
{
if(count==20)
{
count=0;
miao++;//秒加
if(miao==60)
{
miao=0;
write_com(0x38);//显示
write_com(0x0c);//光标不显示
write_com(0x06);//指针加1，整屏不移动
write_com(0x01);//清屏
write_com(0x80);//指针指向0x80
for(num=0;num<16;num++)//第一行显示table数组
write_ymd(6,month);
write_com(0x80+7);