摘要：?jiǎn)纹?jì)算機(jī)既單片微型計(jì)算機(jī)。由RAM,ROM,CUP構(gòu)成，定時(shí)，計(jì)數(shù)和多種接口與一體的微型控制器。他體積小，成本低，功能強(qiáng)，廣泛應(yīng)用于智能產(chǎn)業(yè)和工業(yè)自動(dòng)化上。而51 系列單片機(jī)是各單片機(jī)中最為典型和最有代表性的一種。這次畢業(yè)設(shè)計(jì)通過對(duì)它的學(xué)習(xí)，應(yīng)用，從而達(dá)到學(xué)習(xí)，設(shè)計(jì)的能力。
本設(shè)計(jì)主要涉及了一個(gè)基于AT89C51單片機(jī)的電子時(shí)鐘。并在數(shù)碼管上顯示相應(yīng)的時(shí)間。并通過一個(gè)控制鍵用來實(shí)現(xiàn)時(shí)間的調(diào)節(jié)和是否進(jìn)入省電模式的轉(zhuǎn)換。
單片機(jī)自20世紀(jì)70年代問世以來，以其極高的性能價(jià)格比，受到人們的重視和關(guān)注，應(yīng)用很廣、發(fā)展很快。單片機(jī)體積小、重量輕、抗干擾能力強(qiáng)、環(huán)境要求不高、價(jià)格低廉、可靠性高、靈活性好、開發(fā)較為容易。由于具有上述優(yōu)點(diǎn)，在我國(guó)，單片機(jī)已廣泛地應(yīng)用在工業(yè)自動(dòng)化控制、自動(dòng)檢測(cè)、智能儀器儀表、家用電器、電力電子、機(jī)電一體化設(shè)備等各個(gè)方面，而51單片機(jī)是各單片機(jī)中最為典型和最有代表性的一種。這次畢業(yè)設(shè)計(jì)通過對(duì)它的學(xué)習(xí)、應(yīng)用，以AT89S51芯片為核心，輔以必要的電路，設(shè)計(jì)了一個(gè)簡(jiǎn)易的電子時(shí)鐘，它由4.5V直流電源供電，通過數(shù)碼管能夠準(zhǔn)確顯示時(shí)間，調(diào)整時(shí)間，從而到達(dá)學(xué)習(xí)、設(shè)計(jì)、開發(fā)軟、硬件的能力。

關(guān)鍵詞：?jiǎn)纹瑱C(jī)、電子時(shí)鐘

ABSTRACT:A monolithic computer is single chip microcomputer. By RAM, ROM, CUP, timing, counting and multiple interfaces and the integration of the micro controller. He has the advantages of small volume, low cost, strong function, widely used in smart industries, and industrial automation. And 51 Series SCM is the most typical and the most representative one. The graduation design through the study, application, to achieve the study, design ability.
This design mainly involves a AT89C51 microcontroller based on the electronic clock. And in digital tube display the corresponding time. And through a control key is used to realize the time regulated and whether to enter power-saving mode conversion.
Since the 1970 s chip since the advent, with its high cost performance and attention by people and attention, it is widely used and fast development. SCM small volume, light weight, strong anti-jamming capability, environmental demand is not high, low cost, high reliability, flexibility is good, development more easy. Because of the above features, in our country, the microcontroller is widely used in industrial automation control, automatic detection, intelligent instrument and apparatus, household appliances, power electronics, mechanical and electrical equipment, and other aspects, and 51 SCM is the most typical chip and most representative one. The graduation design through to its study, application to AT89S51 chips as the core, with the necessary circuit, design of a simple electronic clock, it by 4.5 V dc power supply, through the digital tube can show time, adjust the time, thus to learning, the design, the development of software and hardware in the ability.

Key word: Single-chip microcomputer AT89S












目 錄

前 言 1
第一章 原理 3
第二章 方案 3
第三章 系統(tǒng)設(shè)計(jì) 4
3.1 總體設(shè)計(jì) 4
3.1.1系統(tǒng)說明 4
3.2 模塊設(shè)計(jì) 4
3.2.1電源部分 4
3.2.2復(fù)位電路 5
3.3.3程序下載接口 6
3.3.4位選部分 6
3.3.5數(shù)碼管的連接電路 6
3.3.6控制部分 8
第四章 原理圖.....................................................................................................................13
第五章 軟件設(shè)計(jì)................................................................................................................ 14
5.1 程序流程圖 14
5.2 源程序 15
第六章 總結(jié).........................................................................................................................21
參考文獻(xiàn)（References）： 23