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主时钟20MHz，外接副时钟接32。768KHz做实时时钟频率，在程序运行中，发现每一分钟，时间要慢2秒，请问是怎么回事？下面是RE做RTC的部分程序，请帮忙解决
#pragma interrupt INT_timer_re();
void Clock_Init (void)
{
  uCHAR detectTime=10;
  prcr=0x01;         
  cm13=1;             
  cm15=1;            
  cm05=0;            
  while(0!=detectTime)
  {
   if(ocd3) twdDelay(50);
   detectTime--;
  }
  if(ocd3)       
  {
   fra00=1;    
   twdDelay(50);
   fra1=0;     
   twdDelay(50);
     fra01=1;      
   ocd=1;      
  }
  else
      ocd=0;     
   cm16=0;   
   cm17=0;    
   cm06=0;   
   prcr=0;          
}
void Sub_Clock_Init (void)
{
  uCHAR detectTime=10;
  pd4_3 = 0;            //P4_3(XCIN), P4_4(XCOUT): Set input port
  pd4_4 = 0;            //P4_3(XCIN), P4_4(XCOUT): Set input port
  prc0=1;               //System control register protect disabled       
  cm04=1;               //XCIN-XCOUT oscillation function
  prc0=0;               //System control register protect                  
  while(0!=detectTime)
  {
   twdDelay(50);
   detectTime--;
  }   
}
void timer_re_init(void)
{
 uCHAR detectTime=10;
 tstart_trecr1 = 0;     /* Stop Timer RE operation */
    while(0!=detectTime)
    {
   if(tcstf_trecr1 == 0)    
     break;
   twdDelay(50);
   detectTime--;
    }  
 treic = 0x00;      /* Disable Timer RE Interrupt */
 
 trerst_trecr1 = 1;     /* Timer RE Register and Control Circuit Reset */
 trerst_trecr1 = 0;
  
 rcs0_trecsr = 0;     /*Set to 0 in real-time clock mode */
 rcs1_trecsr = 0;                    //Set to 0 in real-time clock mode
 rcs2_trecsr = 0;     //Set to 0 in real-time clock mode
 rcs3_trecsr = 1;     /* Set to "1" real-time clock mode */
    
 tresec = 0x00;                      //Second data, 00 second set
    tremin = 0x00;                      //Minute data, 00 minute set
    trehr = 0x00;                       //Hour data, 00 hour set
    trewk = 0x00;                       //Day of week data, Sunday set

    toena_trecr1 = 0;                   //Disable clock output
 h12_h24_trecr1 = 1;                 //Operating mode, 24-hour mode set
 
 pm_trecr1 = 0;                      //A.M./P.M. bit, a.m. set
 int_trecr1 = 1;                     //Set to 1 in real-time clock mode
 seie_trecr2 = 1;                    //Period of the second interrupt enabled
  
 treic = 0x07;      /* Timer RE interrupt enabled (level 2) */
  
 tstart_trecr1 = 1;     /* Start Timer RE operation */
 detectTime=10;
    while(0!=detectTime)
    {
   if(tcstf_trecr1)   
     break;
   twdDelay(50);
   detectTime--;
    }  
}

void hdwinit( void )
{
 _DisbleInt;
 /* Clock generator initiate */
 Clock_Init();
 /* Port initiate */
 Port_Init();
 /* INT initiate */
 INT_Init();
 /* WDT initiate */
 //WDT_Init();
 /* AD initiate */
 AD_Init();
 /* TM00 initiate */
 timer_ra_init();
 /* TM01 initiate */
 timer_rc_init();
 //real time clock initate
 Sub_Clock_Init();
 timer_re_init();
 /*IIC initate*/
 Iic_init();
 _EnableInt;   //开中断
}

void main(void)
{   
 hdwinit();
 while(1)
 {
 }
}
void INT_timer_re(void)
{
 TimeData[0] = tresec&0x7f;      //Second data backed up
 TimeData[1] = tremin&0x7f;      //Minute data backed up
 TimeData[2] = trehr&0x3f;       //Hour data backed up
 TimeData[3] = trewk&0x07;       //Week data backed up
 TimeData[4] = trecr1;           //A.M./P.M. bit backed up
}