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<h2>
<a name="1206416"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">interrupt_clear</font>
</h2><hr>
<p>
<a name="1206417"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Clear a pending interrupt level</font>
</p>
<h3>
<a name="1206418"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
</h3>
<a name="1206420"> </a><font size=2 face=Courier><strong>#include <interrup.h><br></strong></font>
<a name="1271065"> </a><font size=2 face=Courier><strong>int interrupt_clear( int <font size=2 face=Courier><strong><em>Level </em></strong></font>)<br></strong></font>
<h3>
<a name="1206421"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
</h3>
<p>
<a name="1231400"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong>int </strong></font><font size=2 face=Courier><strong><em>Level</em></strong></font></b></font>
<br>
<dl><dl> <dl>
<dt> <a name="1231402"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Interrupt level</font>
</dl>
</dl></dl>
<h3>
<a name="1206424"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Results</font>
</h3>
<p>
<a name="1206425"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>0</strong></font> for success, <font size=2 face=Courier><strong>-1</strong></font> if an error occurs.</font>
</p>
<h3>
<a name="1206426"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>
<p>
<a name="1206427"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>-1</strong></font> if the interrupt level is illegal.</font>
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<h3>
<a name="1206428"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Description</font>
</h3>
<p>
<a name="1206429"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This function clears the specified pending interrupt level. Interrupts must be disabled when writing to the interrupt controller's <span class=Signal>Pending</span> register, and so this function first reads whether the interrupt is enabled, and if so disables it, before writing to the <span class=Signal>Clear_Pending</span> register to clear the interrupt, and finally re-enabling the interrupt if it was previously enabled.</font>
</p>
<h3>
<a name="1206430"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Applies to</font>
</h3>
<p>
<a name="1206431"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">ILC-None, ILC-1.</font>
</p>
<h3>
<a name="1206432"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Callable from</font>
</h3>
<p>
<a name="1206433"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A task, interrupt service routine or a high priority process (on an ST20C2).</font>
</p>
<h3>
<a name="1206434"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">See also</font>
</h3>
<p>
<a name="1206435"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><a href="libs32.htm#1206438"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>interrupt_clear_number</i></font></a>, <a href="libs49.htm#1206976"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>interrupt_raise</i></font></a>, <a href="libs47.htm#1242528"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>interrupt_pending</i></font></a></font>
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