34.16 Register Write Protection

To prevent any single software error from corrupting SMC behavior, certain registers in the address space can be write-protected by setting the WPEN bit in the Write Protection Mode Register (SMC_WPMR).

If a write access to a write-protected register is detected, the WPVS flag in the Write Protection Status Register (SMC_WPSR) is set and the field WPVSRC indicates the register in which the write access has been attempted.

The WPVS bit is automatically cleared after reading SMC_WPSR.

The following registers can be write-protected:

• SMC Setup Register
• SMC Pulse Register
• SMC Cycle Register
• SMC Mode Register
• SMC Off-Chip Memory Scrambling Register
• SMC Safety Report Interrupt Enable Register