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Microcontroller Clock signal

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I am bit confused with micro controller input clock signal. Should it be it a pulsed signal or sine wave? Generally the output of a crystal is sine wave which is given as input to micro controller, will the controller convert this wave into pulses and does the processing?

Ian Rogers

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The oscillator circuit is usually shown in the datasheet.. The signal is indeed converted to a square wave, so any wave ie RC ( more triangular ) and XT / HS ( sinusoidal ) or buffered ( square ) will work okay..
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