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Silicon Labs EFM32: I want to use an external oscillator, is it a square wave or a sine wave?

EFx32

The external clock (HFXO, LFXO) supports both square waves and sine waves.
For more details, please refer to the application note below.

For the circuit when using an external oscillator, please refer to anothertopic(When using an external oscillator, how should I connect it?).

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