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bare minimum for PIC 16F84A

Discussion in 'Hobby Electronics' started by wiredmonkey, Oct 11, 2004.

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  1. wiredmonkey

    wiredmonkey Guest

    Hi All,

    I've recently jumped into the world of MCU's and have had a great time
    of doing so. I've managed to grasp assembler over the past few weeks
    quite well and have pulled off some fun little tricks with LCD panels
    and the like. All this had been performed virtually however with a
    simulator I bought (oshonsoft if anyone is interested). I have built a
    PIC programmer and it seems to do the trick (well, i can write and read
    from the mcu). Now my question is, how do I get the darn thing to work
    in the physical world. I place the mcu into a breadboard, connect vdd
    to 5V+ and make vss the negative. I also have tried connecting osc1 and
    osc2 to a 4.0Mhz crystal (though it has no ground?). None of this
    works, If anyone can let me know what the bare minimum setup is to
    'power up' a pic16f84a it would be greatly appreciated :)

  2. Ken Taylor

    Ken Taylor Guest

    Hi. You need a few capacitors as well as the bare crystal - take a peek
    or go to microchip's website for the full data which I believe will have
    test circuits.

  3. Josh

    Josh Guest

    Don't forget to pull up _MCLR (pin 4), and a small (~20pf) capacitor
    from each crystal leg to ground and you should have it going. If you're
    using a ceramic resonator instead of a crystal, just earth the center
    pin, no need for the caps.

  4. Don McKenzie

    Don McKenzie Guest

    Have a look at:
    you will see a schematic for simple support circuitry there.


    Don McKenzie
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