SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The processor enters a lockup state if a hard fault occurs when executing the NMI or hard fault handlers. When the processor is in the lockup state, it does not execute any instructions. The processor remains in lockup state until it is reset, an NMI occurs, or it is halted by a debugger.
NOTE
If the lockup state occurs from the NMI handler, a subsequent NMI does not cause the processor to leave the lockup state.