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32.4.4.1.8.1 Offset
Register
Offset
FEPROT
16h
32.4.4.1.8.2 Function
The FEPROT register defines which emulated 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.
32.4.4.1.8.3 Diagram
Bits
7
6
5
4
3
2
1
0
R
W
Reset
u
u
u
u
u
u
u
u
32.4.4.1.8.4 Fields
Field
Function
7-0
EPROT
EEPROM Region Protect
Individual emulated 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
parameter description).
In NVM Normal mode: 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 emulated EEPROM results in a protection
violation error and sets the FSTAT[FPVIOL] bit.
00000000b - EEPROM region is protected
00000001b - EEPROM region is not protected
Memory map and registers
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
730
NXP Semiconductors
Содержание MWCT101 S Series
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