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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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<font color="#FF0000">单片机的c语言教程...由磁动力工作室明浩编写.51单片机学习网（深圳学林电子有限公司）友情转载</font> 
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<TD class=TopLighNav1 
height=22><font font>　第二课：初步认识51芯片</font></TD></TR></TBODY></TABLE></TH></TR></TBODY></TABLE></DIV></TD></TR></TBODY></TABLE></TD></TR>
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<DIV align=center><FONT 
font>第二课　初步认识51芯片</FONT></DIV></TD></TR>
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<TD width="714"><font font>　　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，"这和PC机上的C语言没有多大的区别呀"。的确没有太大的区别，C语言只是一种程序语言的统称，针对不同的处理器相关的C语言都会有一些细节的改变。编写PC机的C程序时，如要对硬件编程你就必须对硬件要有一定的认识，51单片机编程就更是如此，因它的开发应用是不可与硬件脱节的，所以我们先要来初步认识一下51苾片的结构和引脚功能。MSC51架构的芯片种类很多，具体特点和功能不尽相同（在以后编写的附录中会加入常用的一些51芯片的资料列表），在此后的教程中就以Atmel公司的AT89C51和AT89C2051为中心对象来进行学习，两者是AT89系列的典型代表，在爱好者中使用相当的多，应用资料很多，价格便宜，是初学51的首选芯片。嘿嘿，口水多多有点卖广告之嫌了。：P</font></TD></TR>
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<DIV align=center><font font>图2－1 AT89C51和AT89C2051引脚功能图<BR></font></DIV></TD></TR>   
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style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>4KB可编程Flash存储器（可擦写1000次）<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; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>2KB可编程Flash存储器（可擦写1000次）<O:P></O:P></font></SPAN></P></TD></TR>   
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style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>三级程序存储器保密<SPAN   
lang=EN-US><O:P></O:P></SPAN></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; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
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style="TEXT-ALIGN: center"><SPAN   
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>两级程序存储器保密<SPAN   
lang=EN-US><O:P></O:P></SPAN></font></SPAN></P></TD></TR>   
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style="TEXT-ALIGN: center"><SPAN   
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>静态工作频率<SPAN   
lang=EN-US>:0Hz-24MHz<O:P></O:P></SPAN></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; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=284>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN   
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>静态工作频率<SPAN   
lang=EN-US>:0Hz-24MHz<O:P></O:P></SPAN></font></SPAN></P></TD></TR>   
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<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-top-alt: solid windowtext .5pt"   
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style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>128字节内部RAM<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; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"   
vAlign=top width=284>   
<P align=center class=MsoNormal   
style="TEXT-ALIGN: center"><SPAN lang=EN-US   
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><font font>128字节内部RAM<O:P></O:P></font></SPAN></P></TD></TR>   
<TR>   
<TD   
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 213.2pt; mso-border-top-alt: solid windowtext .5pt"
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