145 lines
8.1 KiB
HTML
145 lines
8.1 KiB
HTML
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<?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>PULSOUT</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">PULSOUT</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/PulsoutEx.htm" target="" title="" alt="" class="MCXref_0">PULSOUT 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">PULSOUT</span> <![CDATA[ ]]><i>Pin</i>,<i> Duration</i></p>
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<h2>Function</h2>
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<p class="PlainText">Generate a pulse on <i>Pin</i> with a width of <i>Duration</i>.
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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
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the I/O pin to use. This pin will be set to output mode.</li>
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<li value="2"><b><i>Duration</i></b> is a variable/constant/expression* (0 - 65535) that
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specifies the duration of the pulse. The unit of time for <i>Duration</i> is
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described below.</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 width="100%" cellpadding="4" cellspacing="0" border="1">
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<tr align="center" bgcolor="#CFCFCF">
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<td width="16%"> </td>
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<td width="12%">BS1</td>
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<td width="12%">BS2</td>
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<td width="12%">BS2e</td>
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<td width="12%">BS2sx</td>
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<td width="12%">BS2p</td>
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<td width="12%">BS2pe</td>
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<td width="12%">BS2px</td>
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</tr>
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<tr align="center">
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<td bgcolor="#CFCFCF">Units in <i>Variable</i></td>
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<td>10 µs</td>
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<td>2 µs</td>
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<td>2 µs</td>
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<td>0.8 µs</td>
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<td>0.8 µs</td>
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<td>2 µs</td>
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<td>0.81 µs</td>
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</tr>
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<tr align="center">
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<td align="center" bgcolor="#CFCFCF">Maximum pulse width</td>
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<td>655.35 ms</td>
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<td>131.07 ms</td>
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<td>131.07 ms</td>
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<td>52.428 ms</td>
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<td>52.428 ms</td>
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<td>123.6 ms</td>
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<td>53.08 ms</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 align="center" colspan="7">
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<p colspan="7" align="center"><a href="PULSIN.htm" target="" title="" alt="" class="MCXref_0">PULSIN</a>
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</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">PULSOUT</span> sets <i>Pin</i> to output mode, inverts the state of that pin;
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waits for the specified <i>Duration</i>; then inverts the state of the pin again;
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returning the bit to its original state. The unit of <i>Duration</i> is described
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above. The following example will generate a 100 µs pulse on I/O pin 5: </p><pre class="BScode" xml:space="preserve">
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PULSOUT 5, 50 ' generate a pulse on pin 5
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</pre>
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<p class="PlainText">The polarity of the pulse depends on the state of the pin before the command
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executes. In the example above, if pin 5 was low, <span class="keyword_in_text">PULSOUT</span> would produce
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a positive pulse. If the pin was high, <span class="keyword_in_text">PULSOUT</span> would produce a negative
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pulse.</p>
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<p class="PlainText">If the pin is an input, the output state bit, OUT5 (PIN5 on the BS1) won't
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necessarily match the state of the pin. What happens then? For example: Pin 7 is
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an input (DIR7 = 0) and pulled high by a resistor as shown below. Suppose that
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pin 7 is low when we execute the instruction: </p><pre class="BScode" xml:space="preserve">
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PULSOUT 7, 5 ' generate a pulse on pin 7
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</pre>
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<p class="PlainText">The figure below shows the sequence of events on that pin. Initially, pin 7
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is high. Its output driver is turned off (because it is in input mode), so the
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10 kΩ resistor sets the state on the pin. When <span class="keyword_in_text">PULSOUT</span> executes, it
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turns on the output driver, allowing OUT7 (PIN7 on the BS1) to control the pin.</p>
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<center>
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<img src="../../graphics/pulsout_sch.gif" border="0">
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</img>
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</center>
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<p> </p>
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<p class="PlainText">Since OUT7 (PIN7 on the BS1) is 0, the pin goes low when made an output. After
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a few microseconds of preparation, <span class="keyword_in_text">PULSOUT</span> inverts the state of the pin;
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from low to high. It leaves the pin in that state for the specified time (10µs
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if using a BS2) and then inverts it again, leaving the pin in its original
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(output) state. </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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