16F88 - AD converter module always "ON"


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  1. #1
    Join Date
    Aug 2006
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    Default 16F88 - AD converter module always "ON"

    Hi there,

    I'm trying to understand the AD converter module on my 16F88.

    For testing purposes, I have a LCD and a pot connected to the PIC and everything runs fine.

    The ADCON0 register controlls the AD module. Bit 0 (ADON) activates or shuts off the module (0=OFF / 1=ON).

    When I set this Bit to 0, I expect the AD converter module to be stopped. Operating the pot at that time will still show changing values on the display.

    I don't understand why.
    Roger

  2. #2
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    Jul 2003
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    Colorado Springs
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    Hi flotulopex,

    If you are using the ADCIN statement to get the A/D values, then it will turn the ADON bit back on each time you use it.

    If you were using the A/D registers manually, it would still be off.

    But if you really want the Pins to be digital, you should...
    Code:
    ANSEL = 0
    CMCON = 7
    HTH,
    DT

  3. #3
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    Thank you.

    I didn't know about the ADCIN exact operation.

    The Micro Code Studio's help file is a little to spartan to me...
    Roger

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