13.9 Register Write Protection

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

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

The WPVS flag is reset by writing the MATRIX_WPMR with the appropriate access key WPKEY.

The registers listed below can be write-protected.