Operation During Sleep Mode

The CWG module operates independently from the system clock and will continue to run during Sleep, provided that the clock and input sources selected remain active. The High-Frequency Internal Oscillator (HFINTOSC) remains active during Sleep, provided that the CWG module is enabled, the input source is active, and the HFINTOSC is selected as the clock source, regardless of the system clock source selected.

In other words: if the HFINTOSC is simultaneously selected as the system clock and the CWG clock source, then when the CWG is enabled and the input source is active, the CPU will go idle during Sleep, but the CWG will continue to operate and the HFINTOSC will remain active. This will have a direct effect on the Sleep mode current.