51单片机实现外部中断0-F

#include< reg51.h>
#define uint unsigned int
#define uchar unsigned char
sfr P0M0 = 0x94;
sfr P0M1 = 0x93;
sfr P2M0 = 0x96;
sfr P2M1 = 0x95;
uchar count;
uchar i;
uchar code leddata[]={
    0xC0,  //"0"
    0xF9,  //"1"
    0xA4,  //"2"
    0xB0,  //"3"
    0x99,  //"4"
    0x92,  //"5"
    0x82,  //"6"
    0xF8,  //"7"
    0x80,  //"8"
    0x90,  //"9"
    0x88,  //"A"
    0x83,  //"B"
    0xC6,  //"C"
    0xA1,  //"D"
    0x86,  //"E"
    0x8E,  //"F"
    0x89,  //"H"
    0xC7,  //"L"
    0xC8,  //"n"
    0xC1,  //"u"
    0x8C,  //"P"
    0xA3,  //"o"
    0xBF,  //"-"
    0xFF,  //??
    0xFF  //???
};
uchar code ledwei[]={
    0x01,0x02,0x04,0x08,
    0x10,0x20,0x40,0x80   
};
void init(){
    EX0 = 1;       
    IT0 = 1;       
    EA = 1;            
}
void display(){       
    P0 = leddata[count];       
    P2 = ~ledwei[i];       
}
void main(){
    P0M0 = 0x00;
    P0M1 = 0x00;
    P2M0 = 0x00;
    P2M1 = 0x00;
    init();       
    while(1)
    {
        display();        
    }
}
void int0() interrupt 2{
    count++;
    i++;
    if(count == 16){
        count = 0;
    }
    if(i == 8){
        i = 0;
    }
}