17.4.4.7 EEPROM Protection Register (FTFE_FEPROT)
The FEPROT register defines which EEPROM regions of the FlexRAM are protected
against program and erase operations. Protected EEPROM regions cannot have their
content changed by writing to it. Unprotected regions can be changed by writing to the
FlexRAM.
Address: 4002_0000h base + 16h offset = 4002_0016h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
* Notes:
x = Undefined at reset.
•
FTFE_FEPROT field descriptions
Field
Description
EPROT
EEPROM Region Protect
Individual EEPROM regions can be protected from alteration by setting the associated EPROT bit to the
protected state. The EPROT bits are not used when the FlexNVM Partition Code is set to data flash only.
When the FlexNVM Partition Code is set to data flash and EEPROM or EEPROM only, each EPROT bit
covers one-eighth of the configured EEPROM data (see the EEPROM Data Set Size parameter
description).
The protection can only be increased. This means that currently-unprotected memory can be protected,
but currently-protected memory cannot be unprotected. Since unprotected regions are marked with a 1
and protected regions use a 0, only writes changing 1s to 0s are accepted. This 1-to-0 transition check is
performed on a bit-by-bit basis. Those FEPROT bits with 1-to-0 transitions are accepted while all bits with
0-to-1 transitions are ignored.
Restriction: Never write to the FEPROT register while a command is running (CCIF=0).
Reset: During the reset sequence, the FEPROT register is loaded with the contents of the EEPROM
protection byte in the Flash Configuration Field located in program flash. The flash basis for the reset
values is signified by X in the register diagram. To change the EEPROM protection that will be loaded
during the reset sequence, the sector of program flash that contains the Flash Configuration Field must be
unprotected; then the EEPROM protection byte must be erased and reprogrammed.
Trying to alter data by writing to any protected area in the EEPROM results in a protection violation error
and sets the FSTAT[FPVIOL] bit.
0
EEPROM region is protected
1
EEPROM region is not protected
Memory map and registers
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
382
NXP Semiconductors
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