53.4.2 Write Protection Registers

To prevent any single software error from corrupting TZAESBASC behavior, certain registers in the address space can be write-protected by setting the WPEN bit or the WPITEN bit in the TZAESBASC Write Protection Mode register (TZAESBASC_WPMR).

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

The WPVS bit is automatically cleared after reading TZAESBASC_WPSR.