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  1. #1
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    external crystal connected to microcontroller

    hi.....
    why crystal is connected to microcontroller in every microcontroller circuits?

    •   Alt10th February 2012, 16:39

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  2. #2
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    Re: external crystal connected to microcontroller

    The Micros need a square wave to run thier internal clocks, by using the appropriate crystal you can set the speed at which the micros run.

    A crystal is one of the most accurate timebases, but you can use a ceramic resonator, R/C or external oscillator.

    Many of the newer micros also have an inbuilt oscillator option as well, while good for many uses, is not quiet as accurate as a crystal.


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