51单片机电子钟显示程序（6位数码管）不知道错在哪，程.....

#include
#include
#define uchar unsigned char
#define set 0
#define run 1
#define keyset 4  //定义按键值
#define keyplu 5
#define keymin 6
#define keymain 7
***it dula=P2^6;
***it wela=P2^7;
***it beep=P2^3;
uchar keyval,ledbit=0,ledsetbit=0;
uchar h,m,s,pp;
uchar code BIT[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                     0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar mode=run;
void setl();
void led(uchar number,uchar ledbit);
void keyscan();
void display(uchar h,uchar m,uchar s);
void delayms(uchar x)
{
  uchar i,j;
  for(i=x;i>0;i--)
for(j=110;j>0;j--);
}
void keyscan()
{
uchar key,temp;
P3=0xfe;
   temp=P3;
   temp=temp&0xf0;
   if(temp!=0xf0)
      {
      delayms(20);    //防抖
      if(temp!=0xf0)
         {
         temp=P3;
         switch(temp)
            {
               case 0xee:
               key=0;
            break;
         case 0xde:
               key=1;
            break;
         case 0xbe:
               key=2;
            break;
               case 0x7e:
               key=3;
            break;

            }
         while(temp!=0xf0)
         {
      P3=temp;
      temp=temp&0xf0;
         }
      }
}
   P3=0xfd;
   temp=P3;
   temp=temp&0xf0;
if(temp!=0xf0)
   {
      delayms(20);
      if(temp!=0xf0)
      {
         temp=P3;
         switch(temp)
         {
              case 0xed:
            key=4;
         break;
         case 0xdd:
            key=5;
         break;
         case 0xbd:
            key=6;
         break;
         case 0x7d:
            key=7;
         break;
         }
      while(temp!=0xf0)
         {
            temp=P3;
      temp=temp&0xf0;
         }
   }
  }
   P3=0xfb;
   temp=P3;
   temp=temp&0xf0;
   if(temp!=0xf0)
   {
   delayms(20);
   if(temp!=0xf0)
      {
      temp=P3;
      switch(temp)
         {
         case 0xeb:
         key=8;
      break;
      case 0xdb:
         key=9;
      break;
      case 0xbb:
         key=10;
      break;
      case 0x7b:
         key=11;
      break;
         }
      while(temp!=0xf0)
      {
         temp=P3;
   temp=temp&0xf0;
      }
   }
}

P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
   {
      delayms(20);
      if(temp!=0xf0)
      {
         temp=P3;
         switch(temp)
            {

         case 0xe7:
               key=12;
            break;
         case 0xd7:
               key=13;
            break;
         case 0xb7:
               key=14;
            break;
         case 0x77:
               key=15;
            break;
            }
         while(temp!=0xf0)
            {
         temp=P3;
         temp=temp&0xf0;
            }
   }
}
  }
void setl()
{
keyscan();
if(keyval=keyset)
{
   if(mode==set&&ledsetbit<=5)
   {
   ledsetbit++;
   }
   if(mode==set&&ledsetbit>5)
   {
   mode=run;
   ledsetbit=0;
   }
   if(keyval==keyplu&&mode==set)
   {
   switch(ledsetbit)
   {
      case 0:if(s<59)s++;break;
   case 1:if(s<50)s+=10;break;
   case 2:if(m<59)m++;break;
      case 3:if(m<50)m+=10;break;
   case 4:if(h<23)h++;break;
   case 5:if(h<14)h+=10;break;
   }
   }
   if(keyval==keymin&&mode==set)
   {
   switch(ledsetbit)
   {
      case 0:if(s>0)s--;break;
   case 1:if(s>10)s-=10;break;
   case 2:if(m>0)m--;break;
      case 3:if(m>10)m-=10;break;
   case 4:if(h>0)h--;break;
   case 5:if(h>10)h-=10;break;
   }
   }

}
}

void led(uchar number,uchar ledbit)
{
  P0=table[number];
  dula=1;
  dula=0;
  if(mode==run)
  P0=BIT[ledbit];
  wela=1;
  wela=0;
  if(mode==set)
  {
if(ledbit==ledsetbit)
P0=0xff;
else
P0=table[number];
dula=1;
dula=0;
  }
}

void display(uchar h,uchar m,uchar s)
{
  unsigned int t=100;
  switch(ledbit)
  {
case 0:led(s%10,ledbit);
case 1:led(s/10,ledbit);
case 2:led(m%10,ledbit);
case 3:led(m/10,ledbit);
case 4:led(h%10,ledbit);
case 5:led(h/10,ledbit);
  }
  ledbit++;
  if(ledbit>5)ledbit=0;
  while(t--);
}

void time0() interrupt  1
{
  TH0=(65536-46080)/256;
  TL0=(65536-46080)%256;
  pp++;
}

void main()
{
TMOD=0x01;
TH0=(65536-46080)/256;
  TL0=(65536-46080)%256;
  ET0=1;
  EA=0;
  TR0=1;
  while(1)
  {
setl();
if(mode==run)
{
   display(h,m,s);
}
else
{
   led();
}
if(pp==20)
{
   pp=0;
   s++;
   if(s==60)
   {
      s=0;
   m++;
   if(m=60)
   {
   m=0;
   m++;
   if(m==60)
   {
      h++;
   if(h==24)
   {
   h=0;
   m=0;
   s=0;
   }
   }
   }
   }
}

  }
}