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Why Kinetis Microcontroller crashed?

Question asked by Gabriele Endrizzi on Apr 5, 2019
Latest reply on Apr 8, 2019 by Jing Pan

I'm using a MK22FX512AVLL12. I have selected LLWU_P15 used like interrupt to wake up the microcontroller.

During normal use I reach some unknown bug in my huge code but the microcontroller reaches a condition i can't understand.

All the GPIO are disabled, the microcontroller seems in sleep. But the wakeup interrupt doesn't wake  up the micro, and the code doesn't restart automatically (watchdog is active, should do it). Only a reset make it waking up. 

There is some protection circuit that could stop the microcontroller in this way?