34.9.5 Register Write Protection
To prevent any single software error that may corrupt SMC behavior, the registers listed below can be write-protected by setting the WPEN bit in the SMC Write Protection Mode register (SMC_WPMR).
If a write access in a write-protected register is detected, the WPVS flag in the SMC Write Protection Status register (SMC_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
The WPVS flag is automatically cleared after reading the SSMC_WPSR.
The following registers can be write-protected: