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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>（三）程序清单<br>
<br>
;本程序把数据写入93LC56/66地址为10H-13H空间，<br>
;然后从10H-13H读回数据，存入20H-23H的寄存器</p>
<p><img src="image/d5.gif" width="538" height="2159" hspace="30"></p>
九、8位并行口的使用<br> <br>
（一）电路设计<br> PIC16C64/74带有一个8位并行口。本例由并行口读、写产生中断，读（对CPU是输出）中断时，把数据送出PORT_D口，计数寄存器加1，并把新值送到输出队列，写（对CPU是输入）中断时，
从PORT_D读取数据，并送给RB口。电路图如下：<br> <p align="center"> <img src="image/a415.gif" width="552" height="383">
</p>
（二）程序流程图<br>
1、主程序<br> <p align="center"><img src="image/a416.gif" width="420" height="584"></p>
<p>2、中断程序</p>
<p align="center"><img src="image/a417.gif" width="360" height="656"></p>
<p>（三）程序清单</p>
<p><img src="image/d6.gif" width="546" height="1583" hspace="30"></p>
<p>十、CPP模式的应用例程<br>
<br>
CPP模式可工作在以下三种状态：<br>
1、捕捉输入<br>
2、比较输出<br>
3、PWM（脉宽调制）输出</p>
<p>（一）PWM输出<br>
PWM的周期由PR2决定，脉宽比由CCPR1L值决定，最高分辩率可达10位。本例由RB口输的值做为周期，RA<1:0>值作为TMR2的分频比，PORT_D值为脉宽高8位，POR_E<1:0>为脉宽低2位。本程序上电时读取RA<1:0>值做为TMR2分频比，每次TMR1中断重新读取RB、RD、RE口值，更新周期和脉宽。</p>
<p>1、流程图<br>
①主程序流程图</p>
<p align="center"><img src="image/a418.gif" width="192" height="416"></p>
②中断服务程序<br> <div align="center">
<p><img src="image/a419.gif" width="292" height="671"> </p>
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<p>2、程序清单</p>
<p><img src="image/d7.gif" width="534" height="1760" hspace="30"></p>
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<p><a href="PIC16Cxxx-9-2.htm">上一页</a> <a href="PIC16Cxxx-9-4.htm">下一页</a>
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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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