31.3.10.3 Manual Usage Model

When the Auto Repeat bit selects manual mode (CRCCTRL.AUTOR=0), the last step of the CRC operation always sets the INTFLAG.CRCDONE bit. The state of INTFLAG.CRCERR reflects the validity of the message (Flash memory region).

If checking the same region (i.e. message) again, simply clear CRCEN, then CRCDONE and CRCERR before setting CRCEN again. The IV loads into the ACC and the operation begins again.