38.3.2.5 Data Bus Accesses

Access attempts to unused Special Function Register (SFR) addresses within the CRCSCAN peripheral’s address space will be discarded and return Bus Error to the CPU.

Attempted writes to read-only SFRs will be discarded and return Bus Error. A bus error received during the scan will cause the CRC Scan to fail, and a parity error on read data will cause the CRC Scan to fail.