Comparators on 18F4520


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  1. #1
    Join Date
    Aug 2009
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    2

    Default Comparators on 18F4520

    I'm just doing a little experimenting and would like to test out the comparators on an 18F4520.

    I don't need an interrupt or a internal reference voltage, I just want a zero-crossing-detector on comparator 2 and be able to view the results on my o-scope.

    I'm starting to wonder if the comparator 2 output is even available on a pic pin ? It's labeled C2OUT, and the datasheet shows RA5 as C2OUT, but I'm not seeing any action on that pin.

    The circuit :



    The input / output (this is what I'm reading on the PIC pin RA1 and output on RA5)



    Thanks .. please convey if you have any idea why I'm not seeing a nice square wave on RA5 of the pic !

  2. #2
    Join Date
    Aug 2009
    Posts
    2

    Default

    Ok it's fixed, info for the archives :

    I had set the comparator mode wrong. 010 is "two independent comparators". 011 is "two independent comparators WITH OUTPUTS"

    I have no idea how I overlooked that for 2 full days.

    <sigh>

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