10.4.5 Operation During Code-Protect and Write-Protect

The DFM can be code-protected using the CP Configuration bit. In-Circuit Serial Programming read and write operations are disabled when code protection is enabled. However, internal reads operate normally. Internal writes operate normally, provided that write protection is not enabled.

If the DFM is write-protected or if NVMADR points at an invalid address location, attempts to set the GO bit will fail and the WRERR bit will be set.