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📄 mega8学习笔记(11)-------cocoguojia 原创--单片机实验室-----嘉哥.htm

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                        class=content9><STRONG>Mega8学习笔记(11)-------cocoguojia&nbsp;原创</STRONG></TD></TR>
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                        <DIV align=right>[ 2008-6-13 13:24:00 | By: <SPAN 
                        class=style3>嘉哥</SPAN> ]</DIV></TD></TR></TBODY></TABLE>
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                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></SPAN>&nbsp;</P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman"></FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面我就以《</SPAN><SPAN 
                        lang=EN-US><FONT face="Times New Roman"> AVR 
                        </FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单片机入门与实践</SPAN><FONT 
                        face="Times New Roman"> </FONT><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">》李弘</SPAN><FONT 
                        face="Times New Roman"> </FONT><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等编著</SPAN><SPAN 
                        lang=EN-US><SPAN style="mso-spacerun: yes"><FONT 
                        face="Times New Roman">&nbsp; </FONT></SPAN></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">北京航空航天大学出版社这本书来讲述学习心得</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第十一章:看门狗及</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">C</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌套汇编简介</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">看门狗定时器右片内一个独立的震荡器驱动。震荡频率为</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">1MHZ</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(在</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">5V</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时的典型值)。</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">看</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">P169</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到</SPAN><SPAN 
                        lang=EN-US><FONT face="Times New Roman">P172<SPAN 
                        style="mso-spacerun: yes">&nbsp;&nbsp; 
                        </SPAN>P171</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中有关闭看门狗的例子</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">看门狗的应用也要和熔丝位配合,参考</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">P172</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">P323</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">6.1</FONT></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">看门狗</SPAN><FONT 
                        face="Times New Roman"> </FONT><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是单片机的忠实护卫,从名字就能看出来。</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在论坛上有即形象又好玩的叫法,在此解释一下</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">养狗:使能看门狗</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">喂狗:清零看门狗</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">被狗咬:看门狗溢出</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">养狗不喂:使能看门狗但没有清零看门狗</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">别饿着狗:别忘了清零看门狗</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等等</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">挺有意思的,呵呵</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面介绍一下</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">C</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">语言中嵌套汇编(在</SPAN><SPAN 
                        lang=EN-US><FONT 
                        face="Times New Roman">CVAVR</FONT></SPAN><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">环境下)</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有两个格式</SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 
                        lang=EN-US><o:p><FONT 
                        face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
                        <P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN 

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