📄 inst_se7.htm

📁 ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片机顶盒软件的开发平台,2.0.5版本,国内找不到的.在国外论坛上花了N天才找到!

💻 HTM

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>13.6 Cycles</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>
    <td><a href="c2isetto.htm"><img src="images/navtoc.gif" width="84" height="23"
    border="0" alt="TOC"> </a></td>
    <td><a href="inst_se6.htm"><img src="images/navprev.gif" width="80" height="23"
    border="0" alt="PREV"> </a></td>
    <td><a href="inst_se8.htm"><img src="images/navnext.gif" width="83" height="23"
    border="0" alt="NEXT"> </a></td>
    <td><a href="c2isetix.htm"><img src="images/navidx.gif" width="84" height="23"
    border="0" alt="INDEX"> </a></td>
  </tr>
</table>

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

<hr align="left">

<blockquote>
<h2>
  <a name="1218267"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">13.6 	 Cycles</font>
</h2><hr>


<p>
  <a name="1218268"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The cycles section gives the number of cycles taken to execute the instruction. This is not always a constant and may depend on:</font>
</p>

<ul>
<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218269"> </a>values in registers affect decision in instruction execution (for example, a nontaken conditional jump takes fewer cycles than a taken jump),</font></p>
<p>  <font size=2  face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1218270"> </a>memory speed.</font></p>
</ul>

<p>
  <a name="1218271"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">To allow for this, various instructions have their cycle times expressed as a formula using the variables shown in <a href="inst_se7.htm#1218302"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table

⌨️ 快捷键说明

复制代码 Ctrl + C

搜索代码 Ctrl + F

全屏模式 F11

切换主题 Ctrl + Shift + D

显示快捷键 ?

增大字号 Ctrl + =

减小字号 Ctrl + -