MCLR Pin


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  1. #1
    Join Date
    Sep 2004
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    montreal, canada
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    Default Re: MCLR Pin

    Can't argue against Datasheet, that's for sure... But (cough) let's have some fun and let's play with words a lil bit.

    Voltages applied to the MCLR pin that exceed its
    specification
    can result in both MCLR Resets and
    excessive current beyond the device specification
    during the ESD event. For this reason, Microchip
    recommends that the MCLR pin no longer be tied
    directly to VDD. The use of an RC network, as shown in
    Here's the fun... MCLR IS tied to VDD...
    Absolute Maximum Ratings(†)
    .....
    .....
    Voltage on MCLR with respect to Vss .................................................. ............................................. -0.3V to +13.5V
    Well OK...max spec for MCLR is set 'round 13 volts... well, if this happen... high likely the PIC will burn way before

    [/end smarta55]
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  2. #2
    Join Date
    Feb 2008
    Location
    Michigan, USA
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    Default Re: MCLR Pin

    Found one of those ghost problems that only seems to occur after days of living with it and finally deciding to go to the Forum and seek and answer....

    On my 18F4550, I have been living with 30 second start up times after programming or a reset. As I was typing the question, it occured to me to check if I had put a pull-up on MCLR.....NOPE!

    Disabled the reset option and tada! it works just the way the datasheet says it should. Imagine!

    Another one for the mental library.
    Bo

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