Refer to the PDF data sheet for device specific package drawings
The MSP432P401x MCUs support 32KB of ROM, with the rest of the 1MB region reserved (for future upgrades). The lower 2KB of the ROM is reserved for TI internal purposes and accesses to this space returns an error response. The rest of the ROM is used for driver libraries.
The entire ROM region returns an error response for write accesses. The lower 2KB of the ROM always returns an error response for any access.