| MCS-51单片机系统中多I/O口的扩展 |
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| 引用本文： | 袁占亭,王继曾,潘峥嵘.MCS-51单片机系统中多I/O口的扩展[J].兰州理工大学学报,1992(1). |
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| 作者姓名： | 袁占亭 王继曾 潘峥嵘 |
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| 作者单位： | 甘肃工业大自动控制系
(袁占亭，王继曾)，甘肃工业大自动控制系(潘峥嵘) |
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| 摘 要： | 本文通过对MCS-51系列单片机硬件结构的研究,提出并实现了一种简单可行的多I/O口扩展原理。在充分考虑了单片机的总线结构的前提下,利用总线设计技术,采用线选法,最大可扩展八位并行I/O口42个;同时,使ROM的空间任意浮动,便于软件开发与调试。利用这一原理设计的多I/O口系统,芯片少,硬件简单,成本低廉,运行可靠,可广泛应用于多组数据采集及多目标控制等场合。
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| 关 键 词： | 输入-输出 地址 译码 扩展 时序 单片机 |
Extending of Multi-I/O Ports in the MCS-51 Single-chip Microcomputer Systems |
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| Yuan Zhanting,Wang jizeng,Pan Zhengrong.Extending of Multi-I/O Ports in the MCS-51 Single-chip Microcomputer Systems[J].Journal of Lanzhou University of Technology,1992(1). |
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| Authors: | Yuan Zhanting Wang jizeng Pan Zhengrong |
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| Institution: | Dept. of Automatic Control |
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| Abstract: | After investigating into the hardware structure of the MCS-51 single-chip micro- computer, a simple and practicable extending principle of multi-I/O ports is proposed in this paper. Considering the bus structure in detail and employing bus designing techniques and wire selecting methods, the maximum number of eight bits parallel I/O ports can be extended to be 42. Meanwhile, the space of ROM can be re-located at will. This makes the software programming and debugging easy. The system has less chips, simple hardware, low cost, and realiable running. It can be widely used for multi-data callecting, multi-object controlling and so on. |
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| Keywords: | input-output address decode extension time sequence single-chip microcomputer |
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