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Can't wake up from Halt Mode

Part Number: F28076

Dear Sir,

我根據範例程式, 執行如下程式進入Halt Mode, 並且在進入Halt mode之前, 有關掉所有的interrupt

SysCtl_enableWatchdogStandbyWakeup();
SysCtl_setWatchdogMode(SYSCTL_WD_MODE_RESET);
SysCtl_enableWatchdogInHalt();


Flash_powerDown(FLASH0CTRL_BASE);
SysCtl_enterHaltMode();

Flash_wakeFromLPM(FLASH0CTRL_BASE);

SysCtl_setClock(DEVICE_SETCLOCK_CFG);

然後我對GPIO pin輸入一個7.8ms pulse喚醒, 

喚醒時, 會執行到SysCtl_setClock(DEVICE_SETCLOCK_CFG), 

但接著執行到CPUTimer_getTimerOverflowStatus()就停了, 無法wake up,

想請問有甚麼原因會造成這種結果?