When to wait for OSCHFS Flag on AVR DA Family

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i just wanted to ask when to wait for the OSCHFS flag, i.e. under which circumstances the OSCHF could still be unstable. I could not find any further info in the datasheet or errata. Also in the application note TB3234 it is not waited for after a change of the frequency via FRQSEL.


Thanks in advance and have a nice weekend!