| 单片机测控系统中P3口的双重使用 |
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| 引用本文： | 贾巍.单片机测控系统中P3口的双重使用[J].襄樊学院学报,2002,23(2):70-72. |
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| 作者姓名： | 贾巍 |
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| 作者单位： | 襄樊供电局,湖北,襄樊,441001 |
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| 摘 要： | MCS－51系列单片机的P3口是一个双功能口，具有特殊性。当T0口（P3．4）或T1口（P3．5）作为内部定时器使用时，其口线还可作为通用输入／输出口使用。章对单片机P3口的定时器／计时器口的双重使用方法，从原理上作了详细分析，并介绍了其在真空压强、测量仪中的实际应用。解决了单片机自身口资源有限的矛盾。
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| 关 键 词： | 测控系统 P3口 单片机 定时器／计时器口 双功能口 |
| 文章编号： | 1009-2854(2002)02-0070-03 |
| 修稿时间： | 2001年12月7日 |
The Double Using of P3 Interface in MCU Measuring and Controlling System |
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| JIA Wei.The Double Using of P3 Interface in MCU Measuring and Controlling System[J].Journal of Xiangfan University,2002,23(2):70-72. |
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| Authors: | JIA Wei |
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| Abstract: | The P3 interface of MCU-51 series MCU has double functions. When T0 interface (P3.4) or T1 interface (P3.5) is used as internal timer, its interface line could also be brought into use as general input/output interface. In this paper , the principle of the double using method of timer/scaler interface of P3 is analysed detailedly , and the practical application is introduced in vacuum isobaric measuring instrument, as a result, the contradiction that the interface resource of MCU itself is limited could be resolved very well. |
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| Keywords: | P3 interface Double using MCU Timer/scaler interface |
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