NXP Semiconductors K32 L2A Series, Reference Manual, Page: 148 / 1379

• Backdoor Key Security Enable (KEYEN)
• Mass Erase Enable (MEEN)
• Freescale Failure Analysis Access Code (FSLACC)
• Flash Secure (SEC) - global secure of all Flash
The flash module provides security information to the MCU based on the state held by
FTFA_FSEC[SEC]. The MCU, in turn, confirms the security request and limits access to
flash resources. During reset, the flash module initializes FTFA_FSEC using data read
from the security byte of the flash configuration field.
NOTE
The security features apply only to external accesses: debug.
CPU accesses to the flash are not affected by the status of
FTFA_FSEC.
In the unsecured state, all flash commands are available on the programming interfaces
either from the debug port (SWD) or from user code execution. When the flash is secured
(FTFA_FSEC[SEC] = 00, 01, or 11), the programmer interfaces are only allowed to
launch mass erase operations. Additionally, in this mode, the debug port has no access to
memory locations.
Introduction
K32 L2A Reference Manual, Rev. 2, 01/2020
148 NXP Semiconductors