MSP430FR5994: 关于从LPM3.5唤醒到执行Main的第一条函数的时间大于数据手册的时间

void RTCinit()
{

	//设置RTC为计数器模式，32KHZ外部晶振，32BIT计数值
	RTC_C_initCounter(RTC_C_BASE,RTC_C_CLOCKSELECT_32KHZ_OSC,RTC_C_COUNTERSIZE_32BIT);
	RTC_C_setCounterValue( RTC_C_BASE,0X0);
	//Enable interrupt for RTC Ready Status, which asserts when the RTC	
	//Calendar registers are ready to read.
	//Also, enable interrupts for the Calendar alarm and Calendar event.
	RTC_C_enableInterrupt(RTC_C_BASE, RTCTEVIE);
	//RTC_C_disableInterrupt(RTC_C_BASE, RTCTEVIE );
	 __enable_interrupt();
}


int8_t Timeing(float fnextTime )
{
	uint32_t ulcounterValue =0;
	if(fnextTime > RTC_MAX_SECOND) //判断时间是否合格
	{
		return -1;
	}
	else if(fnextTime < FLOATERR)
	{
		return -2;
	}
	else
	{
		upMcuState(MCU_SLEEP);
		ulcounterValue = 4294967296 - (uint32_t)((fnextTime)*32768.0);
		RTC_C_holdClock(RTC_C_BASE);
		RTC_C_initCounter(RTC_C_BASE,RTC_C_CLOCKSELECT_32KHZ_OSC,RTC_C_COUNTERSIZE_32BIT);
		RTC_C_setCounterValue(RTC_C_BASE,ulcounterValue);
		RTC_C_enableInterrupt(RTC_C_BASE, RTCTEVIE);
		RTC_C_startClock(RTC_C_BASE);
}

int main(void)
{
// Stop watchdog timer
WDT_A_hold(WDT_A_BASE);

//FRAMCtl_A_enableWriteProtection();

	gIF_GPIOinit();
	io_On;
	RTCinit();                                                      //初始化RTC
	gIF_SystemClockConfig();										//初始化系统时钟



    while(1)
    {

		Timeing(0.1);
      
		io_OFF;
		PMM_turnOffRegulator();
		LPM3;
    }
}