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The answer surely is given in the datasheet (like so often)...for a properly working microcontroller.
But what does "not working properly" mean?
* A faulty microcontroller may do everything: not oscillate, oscillate with wrong frequency (unlikely), start/stop oscillating, properly oscillating, smoke..
* Not working because of no power: it will not oscillate
* Not working because of wrong configuration: oscillating, not oscillating
* Not working because of faulty firmware: oscillating, not oscillating, start/stop oscillating (power down and wakeup)
* ... overtemperature, overvoltage, undervoltage, reset...
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