25.3.1 Register Write Protection

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

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

The following registers can be write-protected by setting SFR_WPMR.WPEN:

• Optical Link Register
• Core Debug Configuration Register
• ERASE Flash Register
• PWM Debug Register