Single Chip Microcomputer has achieved a immerse popularity in all fields in recent years．Due to its small size，low power cost and high performances，it has been welcomed by people.
A method of Digital Clock design based on AT89C51 Micro Controller Unit (MCU) is introduced in this thesis. Introduced the working principle of Digital Clock , performance and features of AT89C51 MCU, and an overview of the Digital Clock with block diagram of the hardware and software implementation, AT89C51chip as the core part with some necessary peripheral circuits, design a simple Digital Clock. AC as the power supply, six eight-segment LED digital-tubes are used for display, three 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. The design achieved all the required basic technical indexes．Furthermore，adopting the idea of hardware-to-software, most of those functions are realized by software, which makes the electro circuit more concise and the system more stable浅谈绩效管理的理解与反思
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Key words： single chip computer; Digital Clock； digital display；Interrupt 摘 要
近几年，单片机在各个领域得到广泛的应用。因为其小巧的体积，低功耗，以及高效的性能，单片机受到了大家的欢迎。本文来自^辣@文~论^文%网*原文请找腾讯#3249-114
该设计介绍了一种基于AT89C51单片机设计数字式时钟的方法。首先介绍了数字式时钟的工作原理、AT89C51 单片机的性能和特点、并概述了用单片机实现数字式时钟的硬件框图及软件实现方法。本设计以AT89C51芯片为核心，辅以必要的外围电路，设计了一个简易的数字式时钟。它由交流电源供电，用辣个八段LED数码管动态扫描来显示时间，采用蜂鸣器进行报时；三个按键实现时间的调整和定时，软件方面采用汇编语言编程。该数字式时钟具有硬件成本低、计时准确、调整时间容易等特点。本系统大部分功能由软件来实现，吸收了硬件软件化的思想，使硬件电路简单明了，系统稳定性大大提高。该系统不仅成功的实现了要求的基本功能,而且有一定的创新功能。
关键词：单片机;数字式时钟；数码显示器；中断
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