Infinite loop problem of microcontroller program

#include                  
void Send(char signal)       //Data sending function
{
  SBUF=signal;
  while(TI==0);
  TI=0;
}

void main(void)             //main function
{  

   int i;
   char a[10]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};   //Character table
   TMOD=0x20;
   SCON=0x40;
   PCON=0x00;
   TH1=0xfd;
   TL1=0xfd;
   TR1=1;
  for(i=0;i<10;i++)
  {
      Send(a[i]);          //Send characters in sequence
   }
}

By reading the program, we can know that when it is executed, the microcontroller will send out a total of ten characters from 0 to 9. The result of Keil simulation is the same. However, when the program is written into the development board and actually run, it becomes sending characters 0 to 9 over and over again, forming an infinite loop - it is difficult to explain why this happens.

In order to correct this phenomenon, we have to add a while(1) statement at the end of the program so that it will work normally.

The modified procedure is as follows:

#include                  
void Send(char signal)       //Data sending function
{
  SBUF=signal;
  while(TI==0);
  TI=0;
}

void main(void)             //main function
{  

   int i;
   char a[10]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};   //Character table
   TMOD=0x20;
   SCON=0x40;
   PCON=0x00;
   TH1=0xfd;
   TL1=0xfd;
   TR1=1;
  for(i=0;i<10;i++)
  {
      Send(a[i]);          //Send characters in sequence
   }
   while(1);                
}

At least through this phenomenon we can know that Keil's simulation does not necessarily represent the actual situation.