is the clock signal measurable?

Discussion in '8bit Microcontrollers' started by Dr. Thomas Ansorg, Mar 10, 2009.

  1. Hello
    I have a 16f84 circuit with a 4Mhz clock signal (quartz), but I cannot
    measure this signal (on the oscilloscope). Is it possible to choose the
    wrong quartz or wrong type of capacitors?

    T.
     
    Dr. Thomas Ansorg, Mar 10, 2009
    #1
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  2. Dr. Thomas Ansorg

    WangoTango Guest

    Yes it is possible.

    You should have your scope on a 1meg input, 50 ohm will shut down the
    oscillator. You should be able to measure a 4MHz signal at the OSC2
    pin.

    You should use a parallel cut crystal NOT a series cut.
     
    WangoTango, Mar 10, 2009
    #2
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  3. Unlikely. The program I used was written by someone else, and it worked. How
    do I see whether the crystal is serial or parallel?

    T.
     
    Dr. Thomas Ansorg, Mar 12, 2009
    #3
  4. Dr. Thomas Ansorg

    WangoTango Guest

    You really can't. It is something you specify when you order.
    If you can pull some kind of part number off the crystal and check that
    with the manufacturer, you might have a chance.
     
    WangoTango, Mar 12, 2009
    #4
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