29.4.6 Security Bit Protection

When the security bit is enabled, any access to the Flash either through the Serial Wire Debug Port (SW-DP) or the Serial Wire JTAG Debug Port (SWJ-DP) or the Trace interface or the Fast Flash Programming Interface, is denied. This ensures the confidentiality of the code programmed in the Flash.

The security bit is GPNVM0.

Disabling the security bit can only be achieved by asserting the ERASE pin at ‘1’, and after a full Flash erase is performed. When the security bit is disabled, all accesses to the Flash are permitted.