NXP Semiconductors Kinetis KE1xZ256, Reference Manual

Page: 302 / 1325

FTFE_FCCOBn field descriptions (continued)
Field Description
FCCOB Endianness and Multi-Byte Access:
The FCCOB register group uses a big endian addressing convention. For all command parameter fields
larger than 1 byte, the most significant data resides in the lowest FCCOB register number. The FCCOB
register group may be read and written as individual bytes, aligned words (2 bytes) or aligned longwords
(4 bytes).
1. Refers to FCCOB register name, not register address
16.4.4.6 Program Flash Protection Registers (FTFE_FPROTn)
The FPROT registers define which program flash regions are protected from program and
erase operations. Protected flash regions cannot have their content changed; that is, these
regions cannot be programmed and cannot be erased by any FTFE command.
Unprotected regions can be changed by program and erase operations.
The four FPROT registers allow up to 32 protectable regions of equal memory size.
Program flash protection register Program flash protection bits
FPROT0 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 the
program flash protection bytes in the Flash Configuration Field as indicated in the
following table.
Program flash protection register Flash Configuration Field offset address
FPROT0 0x000B
FPROT1 0x000A
FPROT2 0x0009
FPROT3 0x0008
To change the program flash protection that is loaded during the reset sequence,
unprotect the sector of program flash memory that contains the Flash Configuration
Field. Then, reprogram the program flash protection byte.
Memory map and registers
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
302 NXP Semiconductors