TMS320F28377D: method of wakeup and data save in Halt mode (LPM)

Hello,

I am testing LPM mode.

I didn't succeed in STANDBY mode, and I succeeded in entering and exiting HALT mode.

I have some questions about result of my test.

1.

Currently, the port I set as wakeup pin is GPIO18.

When I tested it, the result was:

1) GPIO18 LOW -> HALT() executed -> GPIO18 HIGH -> wake up

2) GPIO18 HIGH -> HALT() executed -> GPIO18 LOW -> GPIO18 HIGH -> not wake up

3) GPIO18 HIGH -> HALT() executed -> GPIO18 LOW -> HALT() executed again -> GPIO18 HIGH -> Wake up

That means, the device wakes up when halt is executed only when GPIO18 is LOW. Is it right?

Is there any way to enter and wakeup halt mode when wakeup Pin(GPIO18) HIGH state?

2.

When the device was entering halt and waking up, the data does not saved.

I turned the LED ON right before entering the halt mode, but the LED does not turn on when the device wake up.

if (halt entry condition)
{
   Sts._Led.Led3 = 0;
   HALT();
}

If I write the code like this source, shouldn't it be executed?

Or should I put it in "the interrupt void local_WAKE_ISR(void)" function of example code?

I want to know the method the changed data is not initialized after wake up.

Thank you for your help.