The FSLACC bit of FSEC byte can be used to disable the Freescale/NXP failure analysis.
The FSLACC bit permits the user to disable all special or test mode which is only
accessible by Freescale/NXP. This feature help user to achieve a highest level to control
the access of MCU on chip data.
FSEC sections of the FTFE chapter
for more details.
From debug port point of view, user can only disable the secure mode by the external
mass erase bit from SWD. But if Mass Erase is disabled, the debug port can no longer
unsecure the MCU. Please refer to the "Debug and security" section in the Debug chapter
for more details.
From ROM bootloader point of view, user can only disable the secure mode by
FlashEraseAllUnsecure command or FlashSecurityDisable command. When Mass Erase
is disabled, FlashEraseAllUnsecure command can no longer unsecure the MCU. When
backdoor key access is disabled, FlashSecurityDisable command cannot be used. Please
refer to
for more details.
27.2.2 Flash access protection (FAC)
Flash access controls (FAC) are a configurable memory protection scheme designed to
allow end users to utilize software libraries while offering programmable restrictions to
these libraries. This allows NXP or third-party vendors to pre-program software libraries
into a chip and distribute parts to end customers who can use the pre-programmed
software libraries.
Please refer to the Application Note AN5112:
Using the Kinetis Flash Execute-Only
section in the FTFE chapter for
more details.
27.3 Security hardware accelerators
27.3.1 CRC
This device contain one cyclic redundancy check (CRC) module which can generates
16/32-bit CRC code for error detection.
Security hardware accelerators
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