NXP Semiconductors freescale K51 Series Reference Manual

FTFL_FCCOBn field descriptions (continued)Field DescriptionFCCOB Number Typical Command Parameter Contents [7:0]A Data Byte 6B Data Byte 7FCCOB Endianness and Multi-Byte Access :The FCCOB register group uses a big endian addressing convention. For all command parameter fieldslarger than 1 byte, the most significant data resides in the lowest FCCOB register number. The FCCOBregister group may be read and written as individual bytes, aligned words (2 bytes) or aligned longwords(4 bytes).28.34.6 Program Flash Protection Registers (FTFL_FPROTn)The FPROT registers define which logical program flash regions are protected fromprogram and erase operations. Protected flash regions cannot have their content changed;that is, these regions cannot be programmed and cannot be erased by any FTFLcommand. Unprotected regions can be changed by program and erase operations.The four FPROT registers allow 32 protectable regions. Each bit protects a 1/32 region ofthe program flash memory. The bitfields are defined in each register as follows:Program flash protection register Program flash protection bitsFPROT0 PROT[31:24]FPROT1 PROT[23:16]FPROT2 PROT[15:8]FPROT3 PROT[7:0]During the reset sequence, the FPROT registers are loaded with the contents of theprogram flash protection bytes in the Flash Configuration Field as indicated in thefollowing table.Program flash protection register Flash Configuration Field offset addressFPROT0 0x0008FPROT1 0x0009FPROT2 0x000AFPROT3 0x000BTo change the program flash protection that is loaded during the reset sequence,unprotect the sector of program flash memory that contains the Flash ConfigurationField. Then, reprogram the program flash protection byte.Memory Map and RegistersK51 Sub-Family Reference Manual, Rev. 6, Nov 2011626 Freescale Semiconductor, Inc.