Chapter 28
Security
28.1 Introduction
This chapter summarizes all security related features of this device.
28.2 Flash security feature summary
The flash security features supported by this MCU are summarized here.
28.2.1 Flash security byte
Security state can be enabled via programming Flash security byte (FSEC at 0x0000
040E) in the flash configuration field (a 16 Byte region start from 0x0000 0400). User
can program the FSEC byte using FTFE flash program phrase commands. The FSEC
byte will be loaded into FTFE_FSEC register during boot sequence after chip reset. The
FTFE_FSEC register is read-only.
The SEC bit of FSEC byte controls the chip security status. After enabling device
security, the debug port (SWD) cannot access the memory resources of the MCU, and
ROM boot loader also limited to access flash and not allows reading out flash
information via ROM boot loader command.
The flash security byte (FSEC) also allow user to enable the flash backdoor key access
feature by configuring the KEYEN bits. When backdoor Key is enabled, the software can
unsecure the MCU after presenting the correct backdoor key with Verify Backdoor
Access Key command.
The MEEN bit of FSEC byte can be used to disable the mass erase capability from debug
port and the FlashEraseAllUnsecure command from ROM bootloader.
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