101 lines
5.9 KiB
HTML
101 lines
5.9 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="6" MadCap:lastHeight="94" MadCap:lastWidth="853" MadCap:disableMasterStylesheet="true" MadCap:tocPath="" MadCap:InPreviewMode="false" MadCap:PreloadImages="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" lang="en-us" xml:lang="en-us" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="Default.xml" MadCap:SearchType="Stem">
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<head><title>REVERSE</title>
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<link href="../../SkinSupport/MadCap.css" rel="stylesheet" />
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<link href="../../Resources/Stylesheets/BSE_Help.css" rel="stylesheet" />
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<script src="../../SkinSupport/MadCapAll.js" type="text/javascript">
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</script>
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</head>
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<body>
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<h1 class="code">REVERSE</h1>
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<div class="ImagePlusCaption">
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<div class="Col2">
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<p>
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<img src="../../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
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<img src="../../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
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<img src="../../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
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<img src="../../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
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<img src="../../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
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<img src="../../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
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<img src="../../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
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</p>
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</div>
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<p style="text-align: right;"><a href="../ExampleTopics/ReverseEx.htm" target="" title="" alt="" class="MCXref_0">REVERSE Examples</a>
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</p>
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<p> </p>
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</div>
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<p class="clear"> </p>
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<p> </p>
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<p class="PlainText">Syntax: <span class="keyword_in_text">REVERSE</span> <![CDATA[ ]]><i>Pin</i></p>
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<h2>Function</h2>
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<p class="PlainText">Reverse the data direction of the specified pin.
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</p>
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<ul>
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<li value="1"><b><i>Pin</i></b> is a variable/constant/expression* (0 – 15) that specifies the
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I/O pin to use. This pin will be placed into the mode opposite of its current
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input/output mode.</li>
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</ul>
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<p class="PlainText">*<img src="../../graphics/bs1note.gif" style="vertical-align: super;" /> Note: expressions are not allowed as arguments on the BS1. The range
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of the <i>Pin</i> argument on the BS1 is 0–7.</p>
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<h2>Quick Facts</h2>
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<table cellpadding="4" cellspacing="0" border="1" style="caption-side: top;width: 100%;">
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<col />
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<col />
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<tr bgcolor="#CFCFCF">
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<td width="15%" align="center"> </td>
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<td width="85%" align="center">BS1 and all BS2 models</td>
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</tr>
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<tr>
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<td align="center" bgcolor="#CFCFCF">Related Commands</td>
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<td>
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<p align="center"><a href="HIGH.htm" target="" title="" alt="" class="MCXref_0">HIGH</a>, <a href="TOGGLE.htm" target="" title="" alt="" class="MCXref_0">TOGGLE</a></p>
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</td>
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</tr>
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</table>
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<h2>Explanation</h2>
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<p class="PlainText"><span class="keyword_in_text">Reverse</span> is convenient way to switch the I/O direction of a pin. If the pin
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is an input, <span class="keyword_in_text">Reverse</span> makes it an output; if it's an output, <span class="keyword_in_text">Reverse</span>makes it an input.</p>
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<p class="PlainText">Remember that "input" really has two meanings: (1) Setting a pin to input
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makes it possible to check the state (1 or 0) of external circuitry connected
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to that pin. The current state is in the corresponding bit of the INS register
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(PINS on the BS1). (2) Setting a pin to input also disconnects the output
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driver, the corresponding bit of OUTS (PINS on the BS1).</p>
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<p class="PlainText">The example programs illustrate this second fact
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with a two-tone LED blinker, using the circuit below:</p>
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<p> </p>
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<p style="text-align: center;">
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<img src="../../graphics/reverse_sch.gif" />
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</p>
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<div class="Col2">
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<div class="MasterFoot">
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<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../../HomeTopics/HomePage.htm">Go to Welcome page</a>
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</p>
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</div>
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</div>
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<div class="Col2">
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<div class="MasterFoot">
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<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
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<p style="text-align: right;">Copyright © <span class="ContactInfoCompanyName">Parallax Inc.</span></p>
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<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
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</p>
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</div>
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</div>
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<script type="text/javascript">/* <![CDATA[ */
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/* ]]> */</script>
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<script type="text/javascript" src="../../SkinSupport/MadCapBodyEnd.js">
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</script>
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</body>
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</html> |