Problem with PIC 16F819


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  1. #1
    Join Date
    May 2004
    Location
    NW France
    Posts
    3,653

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    Hi, Newbee

    Just open your PIC datasheet @ the OSC section, and you will discover the reset pin need a fast rising signal to act correctly ...
    you also will find correct circuitry to pass by your supply lazyness ...

    in other words, your supply is a bit slow when giving power, and the reset pin must be kept low till the supply voltage is established ...

    that's why power supervisors like MC33064P / TC54 VN xx have been created.

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  2. #2
    Join Date
    Dec 2010
    Posts
    5

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    Acetronics thanks, I tried both things grounding the MCLRE pin while powering it up with battery instead of adopter supply. It didn't work, so I think the chip must be faulty. Whether on external oscillator or internal its behavior doesn't change.

  3. #3
    Join Date
    May 2008
    Location
    Italy
    Posts
    825

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    (From post 4) .....I had even tried to power it with 9 V battery cells
    (From post 9)....so I think the chip must be faulty. Whether on external oscillator or internal its behavior doesn't change.
    What did you expect after the 9 volts test ?


    Al.
    All progress began with an idea

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