TMS320F28377D: 直接debug和点击flash定时器中断执行频率不一致(程序刷在flash里面)

如题，我的代码中初始化了一个定时器0，但是在用debug下载程序和直接点刷写按钮的方式下，发现GPIO的反转速度是不一样的，代码如下：

interrupt void cpu_timer0_isr(void);
void init_timer(){
    // Interrupts that are used in this example are re-mapped to
    // ISR functions found within this file.
    EALLOW;  // This is needed to write to EALLOW protected registers
    PieVectTable.TIMER0_INT = &cpu_timer0_isr;
    //PieVectTable.TIMER1_INT = &cpu_timer1_isr;
    //PieVectTable.TIMER2_INT = &cpu_timer2_isr;
    EDIS;    // This is needed to disable write to EALLOW protected registers

    InitCpuTimers();
    // 200MHz CPU Freq, 1 second Period (in uSeconds)
    ConfigCpuTimer(&CpuTimer0, 200, 500000);
    // To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any
    // of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in F2837xS_cputimervars.h), the
    // below settings must also be updated.
    CpuTimer0Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0
    IER |= M_INT1;
    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

}
int a=0;
interrupt void cpu_timer0_isr(void)
{
   CpuTimer0.InterruptCount++;

   // Acknowledge this interrupt to receive more interrupts from group 1
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

   GpioDataRegs.GPDTOGGLE.bit.GPIO108 = 1;


   a++;
}

，貌似点了绿色虫子的下载模式定时器时间才是对的，在测试中下载完成后我都断点重启过，结果一样。