NXP Semiconductors K32 L2A Series, Reference Manual, Page: 653 / 1379

24.4.12 Security
The flash memory module provides security information to the MCU based on contents
of the FSEC security register.
The MCU then limits access to flash memory resources as defined in the device's Chip
Configuration details. During reset, the flash memory module initializes the FSEC
register using data read from the security byte of the Flash Configuration Field (see
Flash
Configuration Field Description ).
The following fields are available in the FSEC register. The settings are described in the
Flash Security Register (FTFA_FSEC) details.
Flash security features are discussed further in AN4507: Using the Kinetis Security and
Flash Protection Features . Note that not all features described in the application note are
available on this device.
Table 24-40. FSEC register fields
FSEC field Description
KEYEN Backdoor Key Access
MEEN Mass Erase Capability
FSLACC Factory Security Level Access
SEC MCU security
24.4.12.1 Flash Memory Access by Mode and Security
The following table summarizes how access to the flash memory module is affected by
security and operating mode.
Table 24-41. Flash Memory Access Summary
Operating Mode
Chip Security State
Unsecure Secure
NVM Normal Full command set
NVM Special Full command set
Only the Erase All Blocks, Erase All Blocks
Unsecure and Read 1s All Blocks
commands.
Chapter 24 Flash Memory Module (FTFA)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 653