Microchip Technology megaAVR 0 Series Manual page 92

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megaAVR 0-Series
Clock Controller (CLKCTRL)
Bit 0 – ENABLE Enable
When this bit is written to '1', the configuration of the respective input pins is overridden to TOSC1 and
TOSC2. Also, the Source Select bit (SEL) and Crystal Start-Up Time (CSUT) become read-only.
This bit is I/O protected to prevent unintentional enabling of the oscillator.
Datasheet Preliminary
DS40002015A-page 92
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