14.6 CRC Interrupt
The CRC will generate an interrupt when the BUSY bit
         transitions from 1 to 0. The CRCIF Interrupt Flag bit of the PIRx register is
         set every time the BUSY bit transitions, regardless of whether or not the CRC interrupt is
         enabled. The CRCIF bit can only be cleared in software. The CRC interrupt enable is the
         CRCIE bit of the PIEx register.
