50.8.5 Register Write Protection

To prevent any single software error that may corrupt CAN behavior, the registers listed below can be write-protected by setting the WPEN bit in the CAN Write Protection Mode Register (CAN_WPMR).

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

The WPVS flag is automatically reset after reading CAN_WPSR.

The following registers can be write-protected:

• CAN Mode Register
• CAN Baudrate Register
• CAN Message Mode Register
• CAN Message Acceptance Mask Register
• CAN Message ID Register