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<title>Single 14 Segment Display Driver with Limited ASCII Decoder: My Personal Index Page</title>
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<title>Single 14 Segment Display Driver with Limited ASCII Decoder: 14-segment Display Driver Info</title>
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<div class="title">My Personal Index Page </div> </div>
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<div class="title">14-segment Display Driver Info </div> </div>
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<div class="textblock"><h1><a class="anchor" id="intro_sec"></a>
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<div class="textblock"><h1><a class="anchor" id="intro_sec"></a>
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Introduction</h1>
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Introduction</h1>
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<pre class="fragment"> The module contains:
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<pre class="fragment"> The main purpose of this module is to be fed with ASCI symbol codes and it will output word lighting up the exact segments
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-# Input data register to hold the ASCII symbol codes
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on the 14-segment display to visualize the ASCII character. Current implementation uses input register to store the input code.
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-# Decoder to translate the code to 14-segment display word
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-# here is also the driver
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ASCII symbols are coded in Byte having values from 0x00 to 0x7F. This range covers all the symbols in the decoding table.
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</pre><h1><a class="anchor" id="install_sec"></a>
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The range is doubled because the symbols may be lit with DP on or off. More information may be found in MAX6955 datasheet.
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Installation</h1>
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Follows small revised quote of the most descriptive part related to decoding. Not applicable words are removed.
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<h2><a class="anchor" id="step1"></a>
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Step 1: Opening the box</h2>
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... includes 104-character ASCII font maps for 14-segment... . The characters follow the standard ASCII font, with the
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<pre class="fragment"> etc... </pre> </div></div><!-- contents -->
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addition of the following common symbols: GBP, EUR, Yen, degree, micro, plus/minus, arrow up, and arrow down.
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Seven bits represent the 104-character font map; an 8th bit is used to select whether the decimal point (DP) is lit.
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source: https://datasheets.maximintegrated.com/en/ds/MAX6955.pdf
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</pre><h1><a class="anchor" id="port_disp_data"></a>
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Display Data Out</h1>
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<pre class="fragment"> Typically the data fed to display (single or multiple) is provided for single display at a time.
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If multiple displays are required disp_sel signal must be provided (according typical dynamic display indication).
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</pre><h2><a class="anchor" id="disp_data_bit_mapping"></a>
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Display Segment Bit Mapping</h2>
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<table class="doxtable">
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<th align="center">Bit Number </th><th align="center">14</th><th align="center">13</th><th align="center">12</th><th align="center">11</th><th align="center">10</th><th align="center">9</th><th align="center">8</th><th align="center">7</th><th align="center">6</th><th align="center">5</th><th align="center">4</th><th align="center">3</th><th align="center">2</th><th align="center">1</th><th align="center">0 </th></tr>
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<tr>
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<td align="center">Display Segment</td><td align="center">dp</td><td align="center">m</td><td align="center">l</td><td align="center">k</td><td align="center">j</td><td align="center">i</td><td align="center">h</td><td align="center">g2</td><td align="center">g1</td><td align="center">f</td><td align="center">e</td><td align="center">d</td><td align="center">c</td><td align="center">b</td><td align="center">a </td></tr>
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</table>
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<p>Note that there is no standard way to name the segments. Current data bits correspondt to display segments according this picture: </p><div class="image">
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<img src="https://www.maximintegrated.com/en/images/appnotes/3211/3211Fig02.gif" alt="3211Fig02.gif"/>
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