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📄 走进单片机世界(八).htm

📁 走进单片机世界:单片机入门者的最佳教材!以一系列讲座的形式讲述单片机的基础知识
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML><HEAD><TITLE>走进单片机世界(八)</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<STYLE type=text/css>.style1 {
	COLOR: #0099cc
}
</STYLE>
<LINK href="走进单片机世界(八).files/Skin1.css" type=text/css rel=stylesheet>
<SCRIPT language=JavaScript src="走进单片机世界(八).files/menu.js" 
type=text/JavaScript></SCRIPT>

<SCRIPT language=JavaScript1.2 src="走进单片机世界(八).files/stm31.js" 
type=text/javascript></SCRIPT>

<SCRIPT language=JavaScript src="走进单片机世界(八).files/TreeGuide.js" 
type=text/JavaScript></SCRIPT>

<SCRIPT language=JavaScript type=text/JavaScript>
//树形导航的JS代码
var expandState = 0;
function expand(){
  if(expandState == 0){setPace('master', 0, 10, 10); if(ie){document.menutop.src = '/images/menui.gif'}; expandState = 1;}
  else{setPace('master', -200, 10, 10); if(ie){document.menutop.src='/images/menuo.gif'}; expandState = 0;}
}
document.write("<style type=text/css>#master {LEFT: -200px; POSITION: absolute; TOP: 25px; VISIBILITY: visible; Z-INDEX: 999}</style>")
document.write("<table id=master width='218' border='0' cellspacing='0' cellpadding='0'><tr><td><img border=0 height=6 src=/images/menutop.gif  width=200></td><td rowspan='2' valign='top'><img id=menu onMouseOver=javascript:expand() border=0 height=70 name=menutop src=/images/menuo.gif width=18></td></tr>");
document.write("<tr><td valign='top'><table width='100%' border='0' cellspacing='5' cellpadding='0'><tr><td height='400' valign='top'><table width=100% height='100%' border=1 cellpadding=0 cellspacing=5 bordercolor='#666666' bgcolor=#ecf6f5 style=FILTER: alpha(opacity=90)><tr>");
document.write("<td height='10' align='center' bordercolor='#ecf6f5'><font color=999900><strong>栏 目 树 形 导 航</strong></font></td></tr><tr><td valign='top' bordercolor='#ecf6f5'>");
document.write("<iframe width='100%' height='100%' src='/Article/ClassTree.asp' frameborder=0></iframe></td></tr></table></td></tr></table></td></tr></table>");
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master.curLeft = -200;   master.curTop = 10;
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master.timer = null;
if(ie){var sidemenu = document.all.master;}
if(ns){var sidemenu = document.master;}
setInterval('FixY()',100);
</SCRIPT>

<SCRIPT language=JavaScript type=text/JavaScript>
//改变图片大小
function resizepic(thispic)
{
if(thispic.width>700) thispic.width=700;
}
//无级缩放图片大小
function bbimg(o)
{
  var zoom=parseInt(o.style.zoom, 10)||100;
  zoom+=event.wheelDelta/12;
  if (zoom>0) o.style.zoom=zoom+'%';
  return false;
}
//双击鼠标滚动屏幕的代码
var currentpos,timer;
function initialize()
{
timer=setInterval ("scrollwindow ()",30);
}
function sc()
{
clearInterval(timer);
}
function scrollwindow()
{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos !=document.body.scrollTop)
sc();
}
document.onmousedown=sc
document.ondblclick=initialize

//更改字体大小
var status0='';
var curfontsize=10;
var curlineheight=18;
function fontZoomA(){
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<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY leftMargin=0 background=走进单片机世界(八).files/bg_all.gif topMargin=0>
<DIV id=menuDiv 
style="Z-INDEX: 1000; VISIBILITY: hidden; WIDTH: 1px; POSITION: absolute; HEIGHT: 1px; BACKGROUND-COLOR: #9cc5f8"></DIV>
<TABLE class=top_tdbgall style="WORD-BREAK: break-all" cellSpacing=0 
cellPadding=0 width=760 align=center border=0><!--顶部空距代码-->
  <TBODY>
  <TR>
    <TD class=top_top></TD></TR><!--频道显示代码-->
  <TR>
    <TD class=top_Channel align=right>
      <DIV align=center>
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      cellPadding=0 width=760 align=center border=0>
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          <TD bgColor=#4f4f4f height=4></TD></TR>
        <TR>
          <TD align=middle width=760 height=72>
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              <TR>
                <TD align=middle width=180 height=72><A title=中国单片机资讯网 
                  href="http://www.c51.cn/"><IMG height=60 
                  src="走进单片机世界(八).files/q127.gif" width=170 border=0></A></TD>
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                  href="http://www.c51.cn/"><IMG height=60 
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                        href="http://www.c51.cn/index.html#"><FONT 
                        color=#339933>设为首页</FONT></A></TD></TR>
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        <TR><!--频道显示代码-->
          <TD width=760>
            <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
              <TBODY>
              <TR>
                <TD align=right width="30%" 
                background=走进单片机世界(八).files/ad_dhbg1.gif height=29><FONT 
                  color=#ffffff>今天是: </FONT>
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                  align=absMiddle></TD>
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                  width="100%" align=center border=0>
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                      <TD style="COLOR: #006633" vAlign=center align=middle 
                      background=走进单片机世界(八).files/ad_dhbg.gif bgColor=#fafafa 

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