MSP430F5438A 32.768K主频运行没有问题，高频25M主频运行程序跑飞

我的芯片为MSP5438A,主频为内部时钟25M，应用的外设为Timer，UART，AD,现在的问题就是如果用32.768K主频，程序运行良好，但是如果用25M，程序会跑飞，我的数组的定义都用了__no_init 定义，而且查看寄存器的话，没有出现看门狗复位，内核电压我也抬升到了level 3 ,我的Clk, Timer，UART，AD的配置如下:

void UCS_Init(void)
{
    unsigned int N_FLL=0;
    UCSCTL3 |= SELREF_2;                      // Set DCO FLL reference = REFO  32768HZ
    UCSCTL4 |= SELA_2;                        // Set ACLK = REFO
    __bis_SR_register(SCG0);                  // Disable the FLL control loop
    UCSCTL0 = 0x0000;                         // Set lowest possible DCOx, MODx
    UCSCTL1 = DCORSEL_6;                      // Select DCO range 50MHz operation
    N_FLL = 762;//
    UCSCTL2 = FLLD_1 + N_FLL;                   // Set DCO Multiplier for 25MHz
    // (N + 1) * FLLRef = Fdco
    // (762 + 1) * 32768 = 25MHz
    // Set FLL Div = fDCOCLK/2
    __bic_SR_register(SCG0);                  // Enable the FLL control loop
    
    // Worst-case settling time for the DCO when the DCO range bits have been
    // changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
    // UG for optimization.
    // 32 x 32 x 25 MHz / 32,768 Hz = 781250 = MCLK cycles for DCO to settle
    __delay_cycles(78125);
    
  // Loop until XT1,XT2 & DCO fault flag is cleared
   /*
  do
  {
    UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
                                            // Clear XT2,XT1,DCO fault flags
    SFRIFG1 &= ~OFIFG;                      // Clear fault flags
  }while (SFRIFG1&OFIFG);                   // Test oscillator fault flag   
*/    
}

unsigned char  Fre=2;                       //主频   1为32768  2为 25M

void TimerB0_Init(void)             //1ms定时
{
 
 
  if(Fre==1)
  {
    TB0CTL =  MC_0;         //计数器禁止
//    TBCTL|=MC_1+CNTL_0+TBCLGRP_0;
    TB0CCTL0 |= CCIE;                //中断使能
    TB0CCR0 =32;                  // 1ms定时
    TB0CTL = TBSSEL_1 + MC_1 + TBCLR;  //SMCLK
  }
  else if(Fre==2)
  {
    TB0CTL =  MC_0;         //计数器禁止
//    TBCTL|=MC_1+CNTL_0+TBCLGRP_0;
    TB0CCTL0 |= CCIE;                //中断使能
    TB0CCR0 =60000;                  // 1ms定时
    TB0CTL = TBSSEL_2 + MC_1 + TBCLR;  //SMCLK    
  }
}

void ADC_Init()
{
  P6SEL = 0x10;                             // Enable A/D channel inputs
 
  ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_15; // Turn on ADC12_A, extend sampling time
                                            // to avoid overflow of results
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_3;       // Use sampling timer, repeated sequence
  ADC12MCTL0 = ADC12INCH_4+ADC12SREF_7+ADC12EOS;        // ref+=AVcc, channel = A3, end seq.
  ADC12IE = 0x01;                           // Enable ADC12IFG.3
//  ADC12CTL0 |= ADC12ENC;                    // Enable conversions
//  ADC12CTL0 |= ADC12SC;                     // Start conversion - software trigger                            // 使能转换
}