摘 要

單片機(jī)是集CPU、RAM、ROM、定時(shí)、計(jì)數(shù)和多種接口于一體的微控制器。近年來隨著計(jì)算機(jī)在社會(huì)領(lǐng)域的滲透和大規(guī)模集成電路的發(fā)展，單片機(jī)的應(yīng)用正在不斷地走向深入而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。由于它具有功能強(qiáng)，體積小，功耗低，價(jià)格便宜，工作可靠，使用方便等特點(diǎn)，因此特別適合于與控制有關(guān)的系統(tǒng)，越來越廣泛地應(yīng)用于自動(dòng)控制，智能化儀器，儀表，數(shù)據(jù)采集，軍工產(chǎn)品以及家用電器等各個(gè)領(lǐng)域,本文介紹單片機(jī)AT89C51結(jié)合74LS373設(shè)計(jì)時(shí)鐘定時(shí)控制器實(shí)現(xiàn)的方案。74LS373為三態(tài)輸出的八組緩沖器。本系統(tǒng)將單片機(jī)AT89C51內(nèi)部時(shí)鐘讀出并通過七段數(shù)碼管(LED)顯示出來,通過按鍵設(shè)定的時(shí)間來改變系統(tǒng)的鬧鐘時(shí)間，單片機(jī)依據(jù)設(shè)定的時(shí)間來響鈴，從而實(shí)現(xiàn)了系統(tǒng)的智能化。

關(guān)鍵詞： AT89C51 電子時(shí)鐘 74LS373

Abstract

MCU is a CPU、RAM、ROM、 timing、 counting and multiple interfaces in one microcontroller. In recent years, with the field of computer penetration in the community and the development of large-scale integrated circuits, single-chip applications is steadily moving toward depth and 51 single-chip is the most typical and most representative one. Because of its strong functions, small size, low power consumption, cheap, reliable and easy to use and so on, it is particularly suited to control systems and, more widely used in automatic control, intelligent instruments, meters, data acquisition, military products, as well as household appliances and other fields, This article describes the design of single-chip microcomputer AT89C51 combination 74LS373 clock timing of the program controller. 74LS373 tri-state output for the eight sets of buffers . AT89C51 single-chip microcomputer of the system will read out the internal clock and through the LED display, through the button to set the alarm clock to change the system time, single-chip based on the time to set alarm clock processing, thus realizing the intelligent system.

Key words: AT89C51 MCU; Electronic clock; 74LS373

目 錄

摘 要 1

Abstract 1

目 錄 2

第一章 單片機(jī)概述 3

1.1單片機(jī)的定義 3

1.2單片機(jī)的特點(diǎn) 3

1.3單片機(jī)的應(yīng)用領(lǐng)域 4

第二章 MCS-51單片機(jī)簡介 6

2.1 MCS-51單片機(jī)結(jié)構(gòu)及引腳說明 6

2.2中央處理器(CPU)的結(jié)構(gòu) 8

2.3 AT89C51單片機(jī)的存儲(chǔ)器 10

第三章 LED數(shù)碼管及74LS373簡介 14

3.1 數(shù)碼管的分類 14

3.2 數(shù)碼管的驅(qū)動(dòng)方式 14

3.3 數(shù)碼管應(yīng)用 15

3.4 數(shù)碼管使用的電流與電壓 15

3.5 74LS373簡介 15

第四章 電子鐘功能介紹 16

4.1 系統(tǒng)功能介紹 16

4.2 軟件設(shè)計(jì)流程 16

4.3 電子鐘程序清單 18

第五章 電子鐘軟件實(shí)現(xiàn)仿真 19

5.1 單片機(jī)模擬調(diào)試軟件Keil 19

5.2 Proteus軟件簡介 22

5.3 電子時(shí)鐘仿真 23

5.4 整機(jī)仿真及調(diào)試 25

附錄 29