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Benjamin Valentin f037e06b13 cpu/saml21: enable buck voltage regulator when possible
Switch from the on-chip LDO to the on-chip buck voltage regulator
when not fast internal oscillators are used.

On `saml21-xpro` with `examples/default` this gives

**before:** 750 µA
** after:** 385 µA
2020-04-02 17:25:16 +02:00
..
2019-11-23 22:39:35 +01:00
2019-11-23 22:39:35 +01:00
2019-11-23 22:39:35 +01:00
2019-11-23 22:39:35 +01:00
2020-02-04 13:20:56 +01:00
2020-03-25 19:10:01 +00:00
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