When waking up from power mode 2 and 3 there is a small chance that the
SLEEP.MODE bits are faulty set to a value other than zero before the PCON.IDLE bit is
cleared by the CPU. This causes the chip to re-enter power mode immediately. Since an
enabled interrupt is pending at this point, the chip will wake up and re-enter power mode
continuously and appear to hang.
Once the device hang, only a system reset will get the chip back to normal operation.
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