用定時器實現(xiàn)的1602可調(diào)電子鐘

本人最近小搞了下單片機，目前還是菜鳥，以下是單片機程序，基本功能都可以實現(xiàn)，但程序有點小問題（反應不靈敏），還請高手指點下，感激不盡哦�。�！

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code table[]="   2011-3-11  ";
uchar code table1[]="  14:59:55  ";
uchar count, hour, minute, second, press;
sbit rs=P2^4;
sbit rw=P2^5;
sbit en=P2^6;
sbit key1=P3^0;
sbit key2=P3^1;
sbit key3=P3^2;
void delay ()
{ ; ;}
void write_cmd(uchar cmd)   //1602寫指令
{
    rs=0;
    delay();
    rw=0;
    delay();
    en=0;
    delay();
    P0=cmd;
    en=1;
    delay();
    en=0;
    delay();
}
void write_byte(uchar date)  //1602寫數(shù)據(jù)
{
    rs=1;
    delay();
    rw=0;
    delay();
    en=0;
    delay();
    P0=date;
    en=1;
    delay();
    en=0;    
}    
void delay1(uint z)
{
    uint x, y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);
}
void display(uchar addr, uchar date)  //顯示在液晶屏上
{
    uchar ge, shi;
    ge=date%10;
    shi=date/10;
    write_cmd(0x80+0x40+addr);
    write_byte(shi+0x30);
    write_byte(ge+0x30);
}
void keyscan()  //鍵盤掃描，key1功能鍵，key2增加，key3減少
{
    if(key1==0)
    {
        delay1(5);
        if(key1==0)
        {
            while(!key1);
            press++;
            if(press==1)
            {
                TR0=0;
                write_cmd(0x80+0x40+0x09);
                write_cmd(0x0f);
            }
            if(press==2)
            {
                write_cmd(0x80+0x40+0x06);
                write_cmd(0x0f);
            }
            if(press==3)
            {
                write_cmd(0x80+0x40+0x03);
                write_cmd(0x0f);
            }
            if(press==4)
            {
                press=0;
                write_cmd(0x0c);
                TR0=1;
            }
        }
    }
    if(key2==0)
    {
        delay1(5);
        if(key2==0)
        {
            while(!key2);
            if(press==1)
            {
                second++;
                if(second==60)
                {
                    second=0;
                }
                 display(8,second);
            }
            if(press==2)
            {
                minute++;
                if(minute==60)
                {
                    minute=0;
                }
                display(5,minute);
               
            }
            if(press==3)
            {
                hour++;
                if(hour==24)
                {
                    hour=0;
                }
                display(2,hour);
            }
        }
    }
     if(key3==0)
    {
        delay1(5);
        if(key3==0)
        {
            while(!key3);
            if(press==1)
            {
                second--;
                if(second==-1)
                {
                    second=59;
                }
                 display(8,second);
            }
            if(press==2)
            {
                minute--;
                if(minute==-1)
                {
                    minute=59;
                }
                display(5,minute);
               
            }
            if(press==3)
            {
                hour--;
                if(hour==0)
                {
                    hour=23;
                }
                display(2,hour);
            }
        }
    }
}

void init ()
{
    en=0;
    TMOD=0x01;
    TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
    EA=1;
    ET0=1;
 TR0=1;
    write_cmd(0x38);
    write_cmd(0x0c);
    write_cmd(0x06);
    write_cmd(0x01);
    hour=14;
    minute=59;
    second=55;
}
void timer0 () interrupt 1 //定時器中斷處理函數(shù)
{
    TH0=(65536-50000)/256;
 TL0=(65536-50000)%256;
    count++;
    if(count==18)
    {
        count=0;
  
        second++;
       
        if(second==60)
        {
            second=0;
            minute++;
           if(minute==60)
           {
               minute=0;
               hour++;
               if(hour==24)
               {
                   hour=0;
               }
                display(2,hour);               
            }
            display(5,minute);
        }   
        display(8,second);
    }    
}


void main ()
{
    uchar i;
    init();
    write_cmd(0x80);
    for(i=0;i<15;i++)
    {
        write_byte(table[i]);
        delay1(5);
    }
    write_cmd(0x80+0x40);
    for(i=0;i<13;i++)
    {
        write_byte(table1[i]);
        delay1(5);
    }  
    while(1)
    {
       keyscan();
    }           
}