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Last Post 12 Oct 2005 04:15 PM by  mikea@logicpd.com
General Purpose I/O pins
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Nick Bodis
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07 Oct 2005 09:33 AM
    Can some one direct me to documentation identifying the jumper and pin #s for GPIO?
    mikea@logicpd.com
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    10 Oct 2005 10:07 AM
    Nick,
    What you are going to want to do is take a look at the schematics of the card engine and also get the LH79520 User Guide from Sharp. All of the available GPIO signals will be found in that guide. You can than find which ones you can use versus which you can't because you are using a peripheral.

    LH79520 System-on-Chip User's Guide
    http://www.sharpsma.com/part.php?PartID=173
    Chapter 8 - I/O Control and Multiplexing
    Nick Bodis
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    11 Oct 2005 02:58 PM
    Page 10/12 of the ZOOM SDK Application Board schematic details the pinouts on the debug jumpers. The GPIO signal names defined in the "LH79520 Universal Microcontroller Preliminary User's Guide" don't appear on the schematic. A signal named "PGS X,X" appears to be at many pins, possibly this is a GPIO ? If it is how do you relate it to the signal names defined in the user's manual.
    Nick Bodis
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    12 Oct 2005 08:04 AM
    Once I found the schematic for the application board I was able to track down the pins I needed.

    For example... GPIO pin PD7 is routed to J39 pin #38.
    mikea@logicpd.com
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    12 Oct 2005 04:15 PM
    Nick,
    Looks like you found what you were looking for. By the way, the "PGS X,X" tells you what pages on the schematic that signal goes to.

    For everyone else, once you have a signal on the card engine that you want to use, for example as a GPIO, you simply find out where this connects to the development base board (SDK) on the schematics and you can follow it (searchable .pdf or use the Page numbers) to the debug header.

    Thanks for your response Nick,
    -Mike
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