NXP Semiconductors MWCT101 S Series, Reference Manual

Page: 731 / 1761

32.4.4.1.9 Data Flash Protection Register (FDPROT)
32.4.4.1.9.1 Offset
Register Offset
FDPROT 17h
32.4.4.1.9.2 Function
The FDPROT register defines which data flash regions are protected against 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 FTFC command (except
ERSALLU command and erase all which is triggered external to the FTFC). Unprotected
regions can be changed by both program and erase operations.
32.4.4.1.9.3 Diagram
Bits 7 6 5 4 3 2 1 0
R
DPROT
W
Reset
u u u u u u u u
32.4.4.1.9.4 Fields
Field Function
7-0
DPROT
Data Flash Region Protect
Individual data flash regions can be protected from program and erase operations by setting the
associated DPROT bit to the protected state. Each DPROT bit protects one-eighth of the partitioned data
flash memory space. The granularity of data flash protection cannot be less than the data flash sector
size. If an unused DPROT bit is set to the protected state, the
Erase all Blocks command does not
execute and sets the FSTAT[FPVIOL] bit. Similar to FPROT, if the configuration DFlash size isn't a 2^n
multiple, round up to the next 2^n size for the region_size.
In NVM Normal mode: The protection can only be increased, meaning 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 FDPROT bits with 1-to-0 transitions
are accepted while all bits with 0-to-1 transitions are ignored.
Restriction: The user must never write to the FDPROT register while a command is running (CCIF=0).
Chapter 32 Flash Memory Module (FTFC)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors 731