SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
Each GPIO port is a separate hardware instantiation of the same physical block (see Figure 17-1 and Figure 17-2). The MSP432E4 microcontroller contains 18 ports and thus up to 140 of these physical GPIO blocks. Note that not all pins are implemented on every block. Some GPIO pins can function as I/O signals for the on-chip peripheral modules. For information on which GPIO pins are used for alternate hardware functions, see the device-specific data sheet.