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<title>8051进行8路LED模拟分支控制</title>
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<td align="middle"><font style="FONT-SIZE: 11pt" color="#000000">8051进行8路LED模拟分支控制</font></td>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><font size="3"> </font></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><font size="3">一、设计题目<span lang="EN-US"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">用<span lang="EN-US">8051</span>的<span lang="EN-US">P1</span>口作为输入、<span lang="EN-US">P0</span>口作为输出，通过<span lang="EN-US">74LS244</span>接<span lang="EN-US">8</span>路<span lang="EN-US">LED</span>模拟分支控制。<span lang="EN-US"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; mso-char-indent-count: 2.0"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">P1.0</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold">为低电平时，点亮一<span lang="EN-US">LED</span>；<span lang="EN-US">P1.0</span>为高电平、<span lang="EN-US">P1.1</span>为低电平时点亮全部<span lang="EN-US">LED</span>；当<span lang="EN-US">P1.0</span>、<span lang="EN-US">P1.1</span>都为高电平时，<span lang="EN-US">LED</span>按四个一组，轮流反复点亮;P1.0、P1.1、P1.2都为高电平时，8LED逐一点亮并反复循环。</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt"><font size="3">二、设计目的<span lang="EN-US"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">1</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">．</span><span style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">进一步熟悉和掌握单片机的结构及工作原理。</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">2</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">．</span><span style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">掌握单片机的接口技术及相关外围芯片的外特性，控制方法。</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; mso-char-indent-count: -2.0"><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">3</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">．</span><span style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">通过课程设计，掌握以单片机核心的电路设计的基本方法和技术，了解表关电路参数</span><span style="mso-spacerun: yes; font-family: Arial; mso-bidi-font-size: 10.5pt" lang="EN-US">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">的计算方法。</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">4</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">．</span><span style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">通过实际程序设计和调试，逐步掌握模块化程序设计方法和调试技术。</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><br>
5</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">．</span><span style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt">
</span><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">通过完成一个包括电路设计和程序开发的完整过程，使学生了解开发一单片机应用系</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><span style="mso-spacerun: yes">
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">统全过程，为今后的从事打基础。</span><span lang="EN-US" style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span>三、系统硬件原理分析</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span> <img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200512060901999.JPG" border="0" width="637" height="443"></span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span> 框图:</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span> <img style="BORDER-LEFT-COLOR: #000000; FILTER: ; BORDER-BOTTOM-COLOR: #000000; BORDER-TOP-COLOR: #000000; BORDER-RIGHT-COLOR: #000000" alt src="200512061004000.JPG" border="0" width="493" height="502"></span></p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">参考程序：<span lang="EN-US"><o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial"><span style="mso-spacerun: yes">
</span>ORG 0000H<o:p>
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<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">START:
JNB P1.0 AA</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial"> JNB
P1.1 BB</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">
JNB P1.2 CC</span></p>
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">
MOV RO,#08H ；8LED循环点亮</span></p>
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