27.3.4 Sleep Mode Operation

In all CPU sleep modes, the CRCSCAN peripheral is halted, and will resume operation when the CPU wakes up.

It is possible to enter sleep mode after setting up the CRCSCAN to start a PRIORITY check (see CTRLB27.5.2 Control B for more information), but before the actual check is started. If the CPU is able enter sleep mode before the check starts and a Priority check was configured, the check will start and complete (halting the CPU) immediately after waking up, and before entering any interrupt handler.