17.3.1 Idle and Interrupts
Idle mode ends when an interrupt occurs (even if global interrupts
are disabled), but IDLEN is not changed. The device can re-enter Idle by
executing the SLEEP
instruction. If
Recover-on-Interrupt is enabled (ROI = 1
), the interrupt that brings the
device out of Idle also restores full-speed CPU execution when Doze is also enabled.