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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>十一、TMR1异步时钟方式下的应用<br>
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（一）电路设计<br>
PIC16CXX的定时器TMR1，可接成异步时钟工作方式。在这种方式下，TMR1有自己的振荡电路，即使在睡眠状态下，TMR1也将继续工作。当TMR1溢出时将会产生中断，这种特性极适合于设计省电的实时时钟电路。本例TMR1时钟来自外接32.768KHZ晶振，TMR1每1S产生一次中断，计数器加1后送出RB口，而平时CPU处于睡眠状态。电路图如下：</p>
<p align="center"><img src="image/a426.gif" width="372" height="191"></p>
（二）程序流程图
<p>1、 主程序流程图</p>
<p align="center"><img src="image/a427.gif" width="176" height="403"></p>
2、中断服务程序<br> <p align="center"><img src="image/a428.gif" width="307" height="530"></p>
（三）程序清单<br>
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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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