117 lines
6.4 KiB
HTML
117 lines
6.4 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>COMPARE</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">COMPARE</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_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/CompareEx.htm" target="" title="" alt="" class="MCXref_0" xrefformat="{paratext}">COMPARE Example</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">COMPARE</span> <![CDATA[ ]]><i>Mode,</i> <![CDATA[ ]]><i>Result</i></p>
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<h2>Function</h2>
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<p>Enable or disable comparator, compare voltages on P1 and P2 and retrieve
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comparison result to store in <i>Result</i>.
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</p>
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<ul>
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<li value="1"><b><i>Mode</i></b> is a variable/constant/expression (0 – 2) that enables
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or disables the comparator (input pins P1 and P2) and determines if the
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optional comparator output pin (pin P0) is enabled or not. See the table
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below for an explanation of the <i>Mode</i> values.</li>
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<li value="2"><b><i>Result</i></b> is a variable (usually a bit) in which the
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comparison result is stored.</li>
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</ul>
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<h2>Quick Facts<br /></h2>
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<table width="100%" cellpadding="4" cellspacing="0" border="1">
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<tr bgcolor="#CFCFCF">
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<td width="80" align="center"> </td>
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<td width="80%%" align="center">BS2px</td>
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</tr>
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<tr>
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<td align="center" rowspan="3" bgcolor="#CFCFCF"><i>Mode</i> Values</td>
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<td>0: Disables comparator.</td>
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</tr>
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<tr>
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<td>1: Enables comparator with P0 as <i>Result</i> output.</td>
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</tr>
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<tr>
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<td>2: Enables comparator without P0 as <i>Result</i> output.</td>
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</tr>
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<tr>
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<td align="center" rowspan="2" bgcolor="#CFCFCF"><i>Result</i> Values</td>
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<td>0: Voltage P1 > P2; P0 optionally outputs 0.</td>
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</tr>
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<tr>
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<td>1: Voltage P1 < P2; P0 optionally outputs 1.</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">The <span class="keyword_in_text">COMPARE</span> command enables or disables the built-in comparator
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hardware on the BS2px's I/O pins P0, P1, and P2. I/O pins P1 and P2 are
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the comparator inputs and P0 is optionally the comparator result output
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pin.</p>
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<p class="PlainText">By default, the comparator feature is disabled. Using the <span class="keyword_in_text">COMPARE</span> command with a <i>Mode</i> argument of 1 or 2 enables the comparator feature
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(using input pins P1 and P2) and returns the result of the comparison in
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<i>Result</i>. If <i>Mode</i> is 1, the result of the comparison is also
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output on I/O pin P0. The following is an example of the <span class="keyword_in_text">COMPARE </span>command:</p><pre class="BScode" xml:space="preserve">
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result VAR Bit
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Main:
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COMPARE 1, result
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</pre>
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<p class="PlainText">This example enables the comparator (setting P0 to output the result,
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with P1 and P2 as the comparator inputs) and writes the result of the
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comparison into <i>result</i>. Both <i>Result </i>and the output pin P0
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will be 0 if the input voltage on P1 was greater than that of P2.
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<i>result</i> and the output pin P0 will be 1 if the input voltage on P1
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was less than that of P2.</p>
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<p class="PlainText">Note that the comparator hardware operates independently of the
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execution speed of the BS2px and will continue to run and update P0 if
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Mode = 1, even during sleep mode (execution of <span class="keyword_in_text">END</span>, <span class="keyword_in_text">NAP</span>,
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<span class="keyword_in_text">POLLWAIT</span> 8, or <span class="keyword_in_text">SLEEP</span> commands). To avoid spurious current
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draw during sleep mode, disable the comparator first.</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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