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<td align="right"><b><font style="font-size:16px" color="#990000">——
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<td colspan="2"><font style="font-size:16px" color="#000000"><b>>> <a href="index.htm">PIC16CXXX单片机应用与设计</a>
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<td align="center"><b><font size="3">第九章 PIC16CXX设计范例</font><font size="3"></font></b></td>
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<td height="300"> <p>四、四路A/D转换、4×4键盘矩阵、4位7段数码显示的电路<br>
<br>
（一）电路设计<br>
本例采用PIC16C71，形成一个带四路A/D转换、4×4键盘矩阵、4位7段数码显示的系统。RTCC每隔5ms中断一次，程序每隔20ms扫描一次按键，每隔20ms进行一次A/D转换，当按键为"0"-"3"时，显示相应通道（0-3）的A/D转换结果值。</p>
<p align="center"><img src="image/a399.gif" width="539" height="288"></p>
<p>（二）程序流程图 <br>
1、主程序流程图</p>
<p align="center"><img src="image/a400.gif" width="238" height="647"></p>
2、中断服务子程序<br> <div align="center">
<p><img src="image/a403.gif" width="313" height="1240"></p>
</div>
<p>3、键盘服务子程序</p>
<p align="center"><img src="image/a404.gif" width="219" height="481"></p>
<p>4、A/D服务子程序 </p>
<p align="center"><img src="image/a405.gif" width="201" height="475"></p>
<p>（三）程序清单</p>
<p><img src="image/d1.gif" width="567" height="8181" hspace="30"></p>
<p>五、16CXX和24LC01的联接<br>
<br>
（一）电路设计<br>
24LCXX系列是以I2C串行总线为传输格式的E2PROM器件。有关I2C串行总线的知识请读者查阅有关资料。本例以PIC16C54和24LC01为例，给出了PIC16CXX和24LCXX
之间的软件接口程序。下图为硬件连接图。</p>
<p align="center"><img src="image/a406.gif" width="398" height="162"></p>
<p>（二）程序清单</p>
<p><img src="image/d2.gif" width="584" height="4185" hspace="30"></p>
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<p><a href="PIC16Cxxx-1.htm">第一章</a> <a href="PIC16Cxxx-2.htm">第二章</a>
<a href="PIC16Cxxx-3.htm">第三章</a> <a href="PIC16Cxxx-4.htm">第四章</a>
<a href="PIC16Cxxx-5.htm">第五章</a> <a href="PIC16Cxxx-6.htm">第六章</a>
<a href="PIC16Cxxx-7.htm">第七章</a> <a href="PIC16Cxxx-8.htm">第八章</a>
<a href="PIC16Cxxx-9.htm">第九章</a> <a href="PIC16Cxxx-10.htm">第十章</a></p></td>
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