Quartz crystal oscillator that we use in micro-controller lab oscillates giving constant frequency.Have u thought how does it starts oscillating.
As far as I know ,a crystal of quartz is properly cut and mounted so that it can be made to distort in an electric field by applying a voltage to an electrode near or on the crystal.This property is known as piezoelectricity.This means we apply certain voltage at starting and than after due to piezoelectric effect it continue oscillating. When the field is removed, the quartz will generate an electric field as it returns to its previous shape, and this can generate a voltage.
It means, pin of micro-controller at first supply voltage..what do u think??
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