#include<reg51.h>
#include<stdio.h>
Uart_Init();
main();
{    Uart_Init();
     EX0=1;
  EA=1;
  while(1);
}

void int0() interrupt 0 using 0
{    printf("Timer 0 overflow\n");

}

Uart_Init()
{SCON=0x52;
 TMOD=0x20;
 TCON=0x69;
 TH1=0xf3;
}

怎么調試不出來