inst_s64.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 79 行

HTM
79 行
字号 
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Quadralay WebWorks Publisher Professional Edition 6.0.5">
<meta name="TEMPLATEBASE" content="book_html">
<meta name="LASTUPDATED" content="08/22/03 10:13:51">
<title>fmul</title>

<STYLE TYPE="text/css">
<!--
	span.Signal { text-transform: uppercase; font-family: Verdana }
-->
</STYLE>

</head>

<body link="#3366CC" vlink="#9999CC" text="#000000" alink="#0000CC" bgcolor="#FFFFFF"
background="images/backgrnd.gif">

<p><img src="images/stlogo.gif" width="106" height="83" align="left"
alt="logo here!"> </p>

<table width="331" border="0" align="right" cellpadding="0" cellspacing="0">
  <tr>
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    border="0" alt="TOC"> </a></td>
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    border="0" alt="INDEX"> </a></td>
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</table>

<p><br clear="all">
</p>

<hr align="left">

<blockquote>
<h2>
  <a name="1220295"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">fmul</font>
</h2><hr>


<p>
  <a name="1220296"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">fractional multiply</font>
</p>


<h3>
  <a name="1220297"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Code</font>
</h3>


<p>
  <a name="1220298"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">27 F2</font>
</p>


<h3>
  <a name="1220299"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Description</font>
</h3>


<p>
  <a name="1220300"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Multiply <span class=Signal>Areg</span> by <span class=Signal>Breg</span> treating the values as fractions, rounding the result. The values in <span class=Signal>Areg</span> and <span class=Signal>Breg</span> are interpreted as fractions in the range greater than or equal to -1 and less than 1, that is, the integer values divided by 2<sup>BitsPerWord-1</sup>. The result is rounded. The rounding mode used is analogous to IEEE round nearest; that is, the result produced is the fraction which is nearest to the exact product, and, in the event of the product being equidistant between two fractions, the fraction with least significant bit 0 is produced.</font>
</p>


<h3>
  <a name="1220301"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Definition</font>
</h3>


<p>
  <a name="1226211"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">if (<span class=Signal>Areg</span> = <em>MostNeg</em>) and (<span class=Signal>Breg</span> = <em>MostNeg</em>)

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