[riot-notifications] [RIOT-OS/RIOT] CPU SAML21: fix timers frequency when using slow clocks (#16446)

Antonio Galea notifications at github.com
Thu May 6 00:11:28 CEST 2021

> There is a case for using OSC16M instead of the DFLL - the buck converter can only be enabled if no DPLL/DFLL is used (see [errata sheet](http://ww1.microchip.com/downloads/en/DeviceDoc/SAM_L21_Family_Errata_DS80000781B.pdf)).
> But I can do that as a follow-up.

If I am not mistaken, that errata should be already taken care of, in `_set_active_mode_vreg`; but if you really need a 48MHz clock (for USB, for instance), you just can't work around enabling DFLL48M (at present, DPLL96M is not supported at all in RIOT).

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