EXT INT 4Digit Counter using 7Seg in 8051

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#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
 
sbit clear = P3^4;
 
uchar code DSY_CODE[]=
{
    0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff
};
 
uchar code Scan_BITs[]=
{
    0x20,0x10,0x08,0x04,0x02,0x01
};
 
uchar data Buffer_Counts[]={0,0,0,0,0,0};
uint Count=0;
 
void DelayMS(uint x)
{
    uchar t;
    while(x--)
    {
        for(t=0;t<120;t++);
    }
}
 
void Show_Counts()
{
    uint i;
    Buffer_Counts[3] = Count / 1000;
    Buffer_Counts[2] = Count % 1000 / 100;
    Buffer_Counts[1] = Count % 100 / 10;
    Buffer_Counts[0] = Count % 10;
        
    if(Buffer_Counts[3]==0)
        {
        Buffer_Counts[3] = 0x0a;
        }
        if(Buffer_Counts[2]==0)
        {
            Buffer_Counts[2]=0x0a;
        }
 
        if(Buffer_Counts[1]==0)
        {
            Buffer_Counts[1]=0x0a;
        }
    
 
 
    for(i=0;i<4;i++)
    {
        P2 = Scan_BITs[i];
        P1 = DSY_CODE[Buffer_Counts[i]];
        DelayMS(1);
    }
}
 
void main()
{
    IT0 = 1;
    IE  = 0x81;
    while(1)
    {
        if(clear == 0) Count = 0;
        Show_Counts();
    }
}
 
void EX_INT0() interrupt 0
{
    Count++;
}