FTFA_FPROTn field descriptions (continued)Field DescriptionIn NVM Special mode: All bits of FPROT are writable without restriction. Unprotected areas can beprotected and protected areas can be unprotected.Restriction: The user must never write to any FPROT register while a command is running (CCIF=0).Trying to alter data in any protected area in the program flash memory results in a protection violationerror and sets the FSTAT[FPVIOL] bit. A full block erase of a program flash block is not possible if itcontains any protected region.Each bit in the 32-bit protection register represents 1/32 of the total program flash except for memoryconfigurations with less than 32 KB of program flash where each assigned bit protects 1 KB .0 Program flash region is protected.1 Program flash region is not protected45.4 Functional DescriptionThe information found here describes functional details of the flash memory module.45.4.1 Flash ProtectionIndividual regions within the flash memory can be protected from program and eraseoperations.Protection is controlled by the following registers:• FPROTn —• For 2n program flash sizes, four registers typically protect 32 regions of theprogram flash memory as shown in the following figureChapter 45 Flash Memory Module (FTFA)KL27 Sub-Family Reference Manual , Rev. 5, 01/2016Freescale Semiconductor, Inc. 901
