High frequency counter


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  1. #1
    Join Date
    May 2009
    Location
    Saint-Quentin-en-Yvelines, FRANCE
    Posts
    61

    Default High frequency counter

    Hi,

    I would like to measure the frequency of a square wave signal up to 20 MHz.

    I do not want to pre-divide the frequency to avoid a loss of accuracy and/or increasing the measurement time.
    I am currently using a PIC 18F2685. It works fine with the signal applied to Timer 3 but only up to 2 MHz.

    Does somebody know a PIC 18F with a timer able to count at this high frequency ?



    Many thanks

    MikeBZH

  2. #2
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    2,992

    Default Re: High frequency counter

    Hi Mike.

    Maybe this can help you:
    https://www.google.com/url?sa=t&rct=...9LYSNCf3dHlJrs

    With a humble 16C5x pic can measure up to 50MHz.

    Though use of prescaler is necessary, it does not reduce accuracy.

    Ioannis

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