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 Bus Matrix Write Protect Mode Register (MATRIX_WPMR) with the appropriate access key WPKEY.

The following registers can be write-protected:

• Bus Matrix Master Configuration Registers
• Bus Matrix Slave Configuration Registers
• Bus Matrix Priority Registers A For Slaves
• Bus Matrix Priority Registers B For Slaves
• Bus Matrix Master Remap Control Register