16.3.12 Configuration Change Protection

This peripheral has registers under Configuration Change Protection (CCP). This is a security mechanism to avoid unintentional changes to the NVMCTRL settings. Before writing to these, a specific key must be written to the CPU.CCP register, followed by a write access to the protected bits within four CPU instructions.

Attempting to write to a protected register without following the appropriate CCP unlock sequence leaves the protected register unchanged and returns a Bus Error response on the data bus.

The following registers are under CCP: