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    <TD align=middle width=752 bgColor=#ffffff colSpan=5 height=356><FONT 
      font><FONT color=#ff0000>单片机提高</FONT><FONT color=#ff0000><IMG height=11 
      src="单片机编程技术.files/gif091.gif" width=28 border=0></FONT><FONT 
      color=#454545>WWW.51C51.COM 
      自学单片机的网站:作中国单片机编程技术普及推广第一站!倚天一出宝刀屠龙</FONT></FONT><IMG height=100 
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      font><A href="http://www.8951.com/index.htm">返回主页 给我留言</A> <A 
      href="http://www.8951.com/jiaoxue.htm">单片机教学</A> <A 
      href="http://www.8951.com/tigao.htm">单片机提高</A>&nbsp; <A 
      href="http://www.8951.com/pinzhi.htm">品质技术</A> 单片机网址 <A 
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      href="http://www.8951.com/10/huikan.htm">如何购买</A></FONT>
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      <P 
      align=left>;P3.3警报器。<BR>;***************************************************************************<BR>;* 
      (程序转载请著明出处 ,未声明可适应本站腾龙/isp开发套件/倚天版开发套件&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      *<BR>;*&nbsp; E-mail:sxj1974@163.com (51c51 test web)&nbsp; 
      51单片机学习网,自学单片机的网站&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      *<BR>;* Create by :石学军 <A 
      href="http://www.51c51.com/">http://www.51c51.com/</A>&nbsp;&nbsp; 
      www.8951.com 
      更多例程请登陆网站&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
      *<BR>;***************************************************************************<BR>org 
      00h<BR>ajmp dlv<BR>org 0030h<BR>dlv: mov r2,#08h ;赋循环初值<BR>dlv1: mov 
      r3,#0fah<BR>dlv2: cpl p3.3 ;产生脉冲<BR>lcall d5ms ;延时<BR>djnz r3,dlv2<BR>djnz 
      r2,dlv1<BR>mov r2,#10h ;改变循环初值<BR>dlv3: mov r3,#0fah<BR>dlv4: cpl 
      p3.3<BR>lcall d25ms<BR>djnz r3,dlv4<BR>djnz r2,dlv3<BR>sjmp dlv<BR>d5ms: 
      mov r7,#0ffh ;延时5MS<BR>loop:nop<BR>nop<BR>djnz r7,loop<BR>ret<BR>d25ms: 
      mov r6,#0ffh<BR>lin:djnz r6,lin 
  ;延时2.5MS<BR>ret<BR>end<BR></P></TD></TR></TBODY></TABLE></DIV></CENTER></BODY></HTML>

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