时钟程序加闹铃（一个定时器）

#include
#define uint unsigned int
#define uchar unsigned char
uchar t[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xbf};
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^3;
sbit ring=P2^1;
int aa,bb,cc;
float xx=0;
uchar yy=0;
uchar cnt=20;
uchar num=20;
uchar cntt=0;
uchar temp;
void init()
{
 aa=21;
 bb=23;
 cc=30;
}
void delay(uint z)
{
 uint x,y;
 for(x=z;x>0;x--)
  for(y=11;y>0;y--);
}
/*void key()
{
 if(key2==0)
  {
   delay(5);
    if(key2==1)
   {
    delay(5);
    aa++;
    delay(5);
   }
  }
  
  
} */
void display()
{
 
 {
   P3=0xfe;
   P0=t[aa/10];
   delay(5);
   P3=0xfd;
   P0=t[aa%10];
   delay(5);

   P3=0xfb;
   P0=t[10];
   delay(5);
  
  
   
   P3=0xf7;
   P0=t[bb/10];
   delay(5);
   P3=0xef;
   P0=t[bb%10];
   delay(5);

   
   P3=0xdf;
   P0=t[10];
   delay(5);
  
  
   
   P3=0xbf;
   P0=t[cc/10];
      delay(5);
   P3=0x7f;
   P0=t[cc%10];
   delay(5);

   }
   /*P3=0x7f;
   P0=t[1];
   //delay(5);*/

 

}
void main()
{
 
 init();
 
 TMOD=0x01;//选定时器0，工作方式1
 //TMOD=0x11;
  TH0=(65535-50000)/255;//设置初始值
  TL0=(65535-50000)%255;
   
 /*TH1=(65535-50000)/255;
 
 TL1=(65535-50000)%255; */
  EA=1;//打开总中断
  ET0=1;//打开定时器0中断
  //ET1=1;//开定时器1中断
  //TR1=1;//定时器一开始计数
  TR0=1;//定时器零开始计数
  //PT1=0;
 while(1)
 {
  
   display();
   if(cnt==0)
   {
    cnt=20;
    cc++;
    if(cc>=60)
    {
     cc=0;
     bb++;
     if(bb>=60)
     {
      bb=0;
      aa++;
      if(aa>=23)
      {
       aa=0;
      }
     }
    }
   }
  }
}

void timer0() interrupt 1
{
 TH0=(65535-50000)/255;
 
 TL0=(65535-50000)%255;
 
 cnt--;
 //key();
 
 
 ////////////////////////////key2222222222
 if(aa==7&&bb==0&&cc==0)
  ring=0;
 else
     {
     if(key2==0)
     {
      ring=0;
      delay(50);
      //if(key2==1)
       {if(aa>=23)
        aa=0;
       
       aa++;
         
       delay(50);
       }
      ring=1;
     }
     ///////////////////////////key33333333333333
      if(key3==0)
     {
      ring=0;
      delay(50);
      //if(key2==1)
       {if(bb>=60)
        bb=0;
       
           bb++;
       delay(50);
       }
      ring=1;
     }
       if(key4==0)
     {
      ring=0;
      delay(50);
      //if(key2==1)
       {if(bb<=0)
        bb=59;
       
           bb--;
       delay(50);
       }
      ring=1;
     }
   }
  /*P1=0xfe;
   temp=P1;
   temp=temp&0xf0;
   while(temp!=0xf0)
    {
     delay(5);
     temp=P1;
     temp=temp&0xf0;
     while(temp!=0xf0)
     {
      temp=P1;                                                                  
     switch(temp)
      {
       case 0xee:aa++;
        break;
       case 0xde:aa--;
        break;
       case 0xbe:bb++;
        break;
       case 0x7e:bb--;
        break;
     
         }
       }
    */
}

/*void timer1() interrupt 3   //定时器一中断
{
 
 TH1=(65535-50000)/255;
 
 TL1=(65535-50000)%255;
 
 num--;
 if(num==0)
 {
  num=20;
  xx++;
  if(xx==3600)//一小时
   {xx=0;
    yy++;
     if(yy==7)
     {
      yy=0;
      ring=0;
      //delay(1000000);
      //ring=1;
     }
   }

 }
 
}*/