int.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 78 行

HTM
78 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="12/01/03 14:15:18">
<title>10 Interrupts</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="os20toc.htm"><img src="images/navtoc.gif" width="84" height="23"
    border="0" alt="TOC"> </a></td>
    <td><a href="clock6.htm"><img src="images/navprev.gif" width="80" height="23"
    border="0" alt="PREV"> </a></td>
    <td><a href="int2.htm"><img src="images/navnext.gif" width="83" height="23"
    border="0" alt="NEXT"> </a></td>
    <td><a href="os20ix.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>
<h1>
  <a name="1204413"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">10	 Interrupts</font>
</h1><hr>


<p>
  <a name="1204414"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Interrupts provide a way for external events to control the CPU. Normally, as soon as an interrupt is asserted, the CPU stops executing the current task, and starts executing the interrupt handler for that interrupt. In this way, the program can be made aware of external changes as soon as they occur. This switch is performed completely in hardware, and so can be extremely rapid. Similarly when the interrupt handler has completed, the CPU resumes execution of the interrupted task, which is unaware that it has been interrupted.</font>
</p>


<p>
  <a name="1204415"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The interrupt handler which the CPU executes in response to the interrupt is called the first level interrupt handler. This piece of code is supplied as part of OS20, and simply sets up the environment so that a normal C function can be called. The OS20 API allows a different user function to be associated with each interrupt, and this is called when the interrupt occurs. Each interrupt also has a parameter associated with it, which is passed into the function when it is called. This could be used to allow the same code to be shared between different interrupt handlers.</font>
</p>
</blockquote>

<hr>



<table width="331" border="0" align="left" cellpadding="0" cellspacing="0">
  <tr>
    <td><a href="os20toc.htm"><img src="images/navtoc.gif" width="84" height="23"
    border="0" alt="TOC"> </a></td>
    <td><a href="clock6.htm"><img src="images/navprev.gif" width="80" height="23"
    border="0" alt="PREV"> </a></td>
    <td><a href="int2.htm"><img src="images/navnext.gif" width="83" height="23"
    border="0" alt="NEXT"> </a></td>
    <td><a href="os20ix.htm"><img src="images/navidx.gif" width="84" height="23"
    border="0" alt="INDEX"> </a></td>
  </tr>
</table>
<font size=1 face="Verdana, Arial, Helvetica, sans-serif">&nbsp; &copy; 2001, 2002, 2003 STMicroelectronics. All Rights Reserved.<br>
&nbsp; ADCS 7473749B</font>
</body>
</html>

int.htm - 源码说明

本页面展示了「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!」中的 int.htm 源码文件，采用 HTM 编程语言编写，共 78 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

虫虫下载站收录了大量与Embedded相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?