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📄 第二课：初步认识51芯片　(上一课我们的第一个项目完成了，可能有懂c语言的朋友会说......).htm

📁 单片机的c语言教程,属于初级教材,适合初学者,高手们就不要下了啊!!
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<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>AT89C51<O:P></O:P></font></SPAN></P>   
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style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>xxxx<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>YYWW<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 48.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>AT89LV51<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>xxxx<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>YYWW<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 48.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>AT89C51<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>xxxx-5<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>YYWW<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 48.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>AT89LV51<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>xxxx-5<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>YYWW<O:P></O:P></font></SPAN></P></TD></TR>   
<TR style="HEIGHT: 5.25pt">   
<TD rowSpan=3   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 142.1pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=189>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font><![if !supportEmptyParas]>&nbsp;<![endif]>   
<O:P></O:P></font></SPAN></P>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN   
style="FONT-FAMILY: 宋体"><font font>片内特征字<SPAN   
lang=EN-US><O:P></O:P></SPAN></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>030H=1EH<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="FONT-FAMILY: 宋体"><font font>030H=1EH<O:P></O:P></font></SPAN></P></TD>   
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style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="FONT-FAMILY: 宋体"><font font>030H=1EH<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>030H=1EH<O:P></O:P></font></SPAN></P></TD></TR>   
<TR style="HEIGHT: 5.25pt">   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>031H=51H<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>031H=61H<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>031H=51H<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="FONT-FAMILY: 宋体"><font font>031H=61H<O:P></O:P></font></SPAN></P></TD></TR>   
<TR style="HEIGHT: 5.25pt">   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>032H=FFH<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>032H=FFH<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.05pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=95>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>032H=05H<O:P></O:P></font></SPAN></P></TD>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; HEIGHT: 5.25pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 71.1pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体"><font font>032H=05H<O:P></O:P></font></SPAN></P></TD></TR></TBODY></TABLE></TD></TR>   
<TR>   
<TD width="714">   
<DIV align=center><font font>表2－3　Vpp与芯片型号和片内特征字的关系<BR></font></DIV></TD></TR>
<TR>
<TD width="714"><font font>　　看到这您对AT89C51引脚的功能应该有了一定的了解了，引脚在编程和校验时的时序我们在这里就不做详细的探讨，通常情况下我们也没有必要去撑握它，除非你想自己开发编程器。下来的课程我们要开始以一些简单的实例来讲述C程序的语法和编写方法技巧，中间穿插相关的硬件知识如串口，中断的用法等等。</font></TD></TR>
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<TD width="714">
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