//液晶屏显示的时钟，可以通过键盘进行控制的#include<reg52.h>#define uint unsigned int#define uchar unsigned char
sbit s1=P2^0;sbit s2=P2^1;sbit s3=P2^2;sbit rd=P3^3;sbit rs=P1^0;sbit rw=P1^1;sbit lcden=P1^2;sbit psb=P1^3;
uchar count,s1num;uchar code table[]="2012--07--04";uchar code table1[]="23: 59: 50";
uchar count,shi,fen,miao,s1num,xiaoshi,day,mouth,year;void delay(uint z){ uchar x,y; for(x=z;x>0;x--) for(y=110;y>0;y--);}
void write_com(uchar com)   //写指令{ rs=0; rw=0; lcden=0; P0=com; delay(5); lcden=1; delay(5); lcden=0;}
void write_dat(uchar dat) //写数据{ rs=1; lcden=0; rw=0; P0=dat; delay(5); lcden=1; delay(5); lcden=0;}
void init()   //初始化{ uchar num;     psb=1; lcden=0; xiaoshi=23; fen=59; miao=55; year=2012; mouth=7; day=4; write_com(0x30); write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); for(num=0;num<13;num++) { write_dat(table[num]); delay(5); } write_com(0x88); for(num=0;num<10;num++) { write_dat(table1[num]); delay(5); } TMOD=0x01; //开启中断 TH0=(65536-50000)/256; TL0=(65536-50000)%256; EA=1; ET0=1; TR0=1;}
void write_sfm(uchar add, uchar dat)        //写时分秒函数{ uchar shi,ge; shi=dat/10; ge=dat%10;  write_com(0x88+add); write_dat(shi+0x30); write_dat(ge+0x30);}
void keyscan() //键盘扫描{ s1num=0; //功能键程序 if(s1==0) { delay(5); if(s1==0) { if(s1==0); delay(5); s1num=s1num+1; while(!s1);
if(s1num==1) { TR0=0; write_com(0x88+4);     write_com(0x0f); } if(s1num==2) { write_com(0x88+2); } if(s1num==3) { write_com(0x88); } if(s1num==4) { s1num=0; write_com(0x0c); TR0=1; }

} } //########################################### if(s1num!=0)   //加数程序 { if(s2==0) { delay(5); if(s2==0) { while(!s2); if(s1num==1) { miao++; if(miao==60) { miao=0;
} write_sfm(4,miao); write_com(0x88+4); //+0x40+10 } if(s1num==2) { fen++; if(fen==60) fen=0; write_sfm(2,fen); write_com(0x88+2); // +0x40+7 } if(s1num==3) { shi++; if(shi==24) shi=0; write_sfm(4,xiaoshi); write_com(0x88); // +0x40+4 } } } //########################################## if(s3==0)  //减数程序 { delay(5); if(s3==0) { while(!s3); if(s1num==1) { miao--; if(miao==-1) miao=59; write_sfm(4,miao); write_com(0x88); //+0x40+10 } if(s1num==2) { fen--; if(fen==-1) fen=59; write_sfm(2,fen); write_com(0x88+2); } if(s1num==3) { shi--; if(shi==-1) shi=23; write_sfm(0,shi); write_com(0x88); } }
} }}
void main()    //主函数{ init(); while(1) { keyscan(); } }
void timer0() interrupt 1   //中断函数{ TH0=(65536-50000)/256; TL0=(65536-50000)%256; count++; if(count==20) { count=0; miao++; if(miao==60) { miao=0; fen++; if(fen==60) { fen=0; xiaoshi++; if(xiaoshi==24) {   xiaoshi=0; day++; if(day==4) { day=0; mouth++; if(mouth==4) { mouth=0; year++; } write_sfm(-5,mouth); } write_sfm(-3,day); }
write_sfm(0,xiaoshi); } write_sfm(2,fen); } write_sfm(4,miao); }} 此帖出自小平头技术问答