SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
Read-only protection prevents the contents of the flash block from being reprogrammed, while still allowing the content to be read by processor or the debug interface. If a FMPREn bit is cleared, all read accesses to the flash memory block are disallowed, including any data accesses. Care must be taken not to store required data in a flash memory block that has the associated FMPREn bit cleared.
The read-only mode does not prevent read access to the stored program, but it does provide protection against accidental (or malicious) erasure or programming. Read-only is especially useful for utilities like the bootloader when the debug interface is permanently disabled. In such combinations, the bootloader, which provides access control to the flash memory, is protected from being erased or modified.