31.3.10.8 Effects of ECC on CRC
CRC reads of the Flash obey the selected ECC mode of the device. If ECC is enabled the CRC uses the corrected data. If ECC is not enabled (either bypass or simple parity) the CRC uses the uncorrected data. ECC errors, either SEC or DED, are not reported to the system for CRC reads. CRC reads of the Flash also do not affect the FLT features or SFR bits.