2.5.4.4 Lockup

The processor enters a lockup state if a fault occurs when executing the NMI or HardFault handlers. When the processor is in lockup state it does not execute any instructions. The processor remains in lockup state until either:

It is reset
An NMI occurs
It is halted by the debugger

Important: If lockup state occurs from the NMI handler a subsequent NMI does not cause the processor to leave lockup state.

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