基于单片机的电子钟设计

文档编号:JD795  文档字数:7710,页数:24

  基于单片机的电子钟设计

摘  要：介绍了一种基于AT89S51单片机设计电子钟的方法。首先介绍了电子钟的工作原理、AT89S51 单片机的性能和特点、并概述了用单片机实现电子钟的硬件框图及软件实现方法。本设计以AT89S51芯片为核心，辅以必要的外围电路，设计了一个简易的电子钟。它由交流电源供电，用六个七段LED数码管动态扫描来显示，用74LS244芯片进行驱动，四个按键实现时间的调整，软件方面采用汇编语言编程。该电子钟具有硬件成本低、计时准确、调整时间容易等特点。
关键词：电子钟；单片机；时间; 发光二极管

Design of Electronic Clock Based On MCU

Abstract: A method of electronic clock design based on AT89S51 Micro Controller Unit (MCU) is introduced in this thesis. Introduced the working principle of electronic clock, performance and features of AT89S51 MCU, and an overview of the electronic clock with block diagram of the hardware and software implementation, AT89S51chip as the core part with some necessary peripheral circuits, design a simple electronic clock. AC as the power supply, six seven-segment LED digital-tubes are used for display, which work in a dynamically scanning display mode and driven by 74LS244 chip, four buttons can be used to adjust the time, in the software aspect, uses assembly language software programming. The design has some features, such as low-cost hardware, time-accurate and easy adjustment of time, and so on.
Keywords: Electronic clock; MCU; Time; LED

目录
摘  要 I
Abstract I
引 言 1
1 多功能电子钟的工作原理 1
2 多功能电子钟原理方框图及整机电路图 1
3 多功能电子钟单元电路的介绍 4
3.1 电源电路 4
3.2  时钟电路 4
3.3  复位电路 4
3.4  键盘电路 5
4  显示器工作原理 5
5 AT89S51芯片介绍 7
6 单片机硬件资源的分配 8
7 软件设计 9
8 误差分析 13
9 具体使用的步骤如下 14
10 结论 15
参考文献 15
谢   辞 16
附 录：电子钟程序清单 (汇编语言) 17

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