请教一个关于MC9S12XEP100的小灯翻转程序 程序, 翻转, 请教

arthur2009

请教MC9S12XEP100程序：定时500ms实现PORTB_PB0管脚的小灯翻转，我在按下面的程序调试后发现小灯只亮，而没有实时翻转，请问是什么原因呢？不胜感激！

#include <hidef.h>      /* common defines and macros */
#include <MC9S12XEP100.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xep100"
#include "CRG_Init.h"
#include "PIT_Init.h"
unsigned char Flag;
void Delay(unsigned int Time)
{
    unsigned char i;
    for(i=0; i<125; i++)
        for( ; Time>0; Time--);
}
void main(void) {
  /* put your own code here */
  EnableInterrupts;
  DDRB=0xff;
  PORTB=0xff;
  
  for(;;) {
  
     if(Flag==1){
      
        Flag=0;
        Delay(50000);
        PORTB_PB0=~PORTB_PB0;
     }
  } /* wait forever */
  /* please make sure that you never leave this function */
}
#pragma  CODE_SEG   NON_BANKED
interrupt void PIT0_Timeout()    //interrupt function when Time0 out 20ms
{
   PITTF &= 0x01;           // Clear the timer0-out flag  
   Flag = 1;
}