inst_s74.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 88 行

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<html>

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<title>wait</title>

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<blockquote>
<h2>
  <a name="1103091"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">wait</font>
</h2><hr>


<p>
  <a name="1103093"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">wait</font>
</p>


<h5>
  <a name="1105402"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Code</font></i>
</h5>


<p>
  <a name="1103094"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">23 F6</font>
</p>


<h5>
  <a name="1106179"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Description</font></i>
</h5>


<p>
  <a name="1103095"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Perform the first part of a semaphore wait (or P) on the semaphore pointed to by <span class=Signal>Areg</span>. If the semaphore count is non-zero then the count is decremented and the process continues; otherwise the current process is added to the back of the semaphore list ready for the current process to be descheduled. The instruction returns a boolean value in <span class=Signal>Areg</span> stating whether a process deschedule is required. </font>
</p>


<p>
  <a name="1103096"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The instruction should be used in the following sequence:</font>
</p>

<dl>  <dl>
    <dt> <a name="1116636"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><strong>ld semptr; wait; cj continue; stop; continue:</strong> </font>
  </dl>
</dl>
<h5>
  <a name="1108225"> </a><i><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Definition</font></i>
</h5>


<p>
  <a name="1103097"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">if (word[<span class=Signal>Areg</span> @ <span class=Signal>s.Count</span>] <font face=symbol><img src="images/inst_a17.gif" height="12" width="8">
</font> 0) <br>{<br>

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