SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The NMI signal is an alternate function for the GPIO port pins specified in the device-specific data sheet.
The alternate function must be enabled in the GPIO for the signal to be used as an interrupt, as described in Section 17. Enabling the NMI alternate function requires the use of the GPIO lock and commit function, similar to the requirements of the GPIO port pins associated with JTAG/SWD functionality (see Section 17.5.20). The active sense of the NMI signal is high; asserting the enabled NMI signal above VIH initiates the NMI interrupt sequence.