目錄

摘　要 3

關(guān)鍵詞： 3

1.緒論 3

1.1概述 3

1.2選題的意義 3

1.3倒計(jì)時(shí)牌的總體設(shè)計(jì)和思路 4

1.4總體設(shè)計(jì)方案系統(tǒng)框圖 4

2.單片機(jī)AT89C51的結(jié)構(gòu)和原理 5

2.1 AT89C51單片機(jī)外部結(jié)構(gòu) 5

2.2 AT89C51單片機(jī)的內(nèi)部結(jié)構(gòu) 5

2.3 AT89C51單片機(jī)主要性能參數(shù) 6

2.4 AT89C51單片機(jī)功能特性概述 6

2.5 AT89C51單片機(jī)引腳功能說(shuō)明 6

2.6 AT89C51單片機(jī)時(shí)鐘電路 8

2.7單片機(jī)的電源電路 8

3單片機(jī)AT89C51的硬件設(shè)備 9

3.1時(shí)鐘芯片PCF8563的選擇 9

3.1.1時(shí)鐘芯片PCF8563概述 9

3.1.2時(shí)鐘芯片PCF863基本組成 9

3.1.3時(shí)鐘芯片PCF863內(nèi)部寄存器 10

3.1.4時(shí)鐘芯片PCF863主要功能的應(yīng)用 11

3.2 LED數(shù)碼管顯示器的譯碼器的選擇 12

3.2.1硬件譯碼方式 12

3.2.2 字段轉(zhuǎn)換芯片MC141513介紹 13

3.3片選譯碼器的選擇 14

3.3.1 74LS145 二—十進(jìn)制譯碼器介紹 14

3.4驅(qū)動(dòng)的選擇 14

3.4.1驅(qū)動(dòng)ULN2003的概述 14

3.5 顯示器的選擇 16

3.5.1 LED數(shù)碼管顯示器介紹 16

3.5.2 LED數(shù)碼管顯示器結(jié)構(gòu) 17

3.5.4 常見(jiàn)的數(shù)字和字符的字段碼 18

3.6單片機(jī)鍵盤(pán)接口設(shè)計(jì) 18

3.6.1鍵盤(pán)簡(jiǎn)介 18

3.6.2 鍵盤(pán)的工作原理 18

4 倒計(jì)時(shí)牌的硬件電路設(shè)計(jì) 20

4.1倒計(jì)時(shí)牌的時(shí)鐘電路 20

4.2倒計(jì)時(shí)牌的顯示和鍵盤(pán)電路 21

5 倒計(jì)時(shí)牌的軟件設(shè)計(jì) 22

小結(jié) 26

致謝 27

參考文獻(xiàn) 27

ABSTRACT 27








倒計(jì)時(shí)牌的設(shè)計(jì)與實(shí)現(xiàn)

 

摘　要：介紹了一個(gè)基于AT89C51單片機(jī)的倒計(jì)時(shí)牌的設(shè)計(jì).系統(tǒng)采用AT89C51作為主控核心,串行實(shí)時(shí)時(shí)鐘芯片PCF8563完成計(jì)時(shí)功能.軟件部分完成了對(duì)各個(gè)模塊的控制、整合,實(shí)現(xiàn)倒計(jì)時(shí)信息的顯示、鍵盤(pán)對(duì)時(shí)鐘的設(shè)置、時(shí)鐘顯示等功能。


關(guān)鍵詞：倒計(jì)時(shí)牌;  AT89C51單片機(jī); 時(shí)鐘芯片




Design of countdown plates based on AT89C51



Abstract: A design of countdown plates based on microcontrollers was studied. In this design,the system used AT89C51 as the controlling core to control the clock chip and a serial real-time clock chip PCF8563 as the clock chip completing timing. The software realized the control and the integration of separatedmodules and finally achieved the functions such as the display c countdown information, the setting of the clock using the keyboard, time showing, etc. This paper presents in detail the algorithm for countdowns.

Key words: countdown;  AT89C51;  timekeeping chip