电工电子技术课程设计-数字电子钟设计说明书.docVIP

数字电子钟 [摘 要]:随着现代电子技术的飞跃发展，各类智能化产品相应而出，为人类的生活带来了无比便利。其中数字电路是智能化产品的重要组成部分。数字电路具有电路简单、可靠性高、成本低等优点，本设计就以数字电路为核心设计电子钟。数字钟是一个将“?时”，“分”，“秒”显示于人的视觉器官的计时装置。它的计时周期为24小时，显示满刻度为23时59分59秒，另外应有校时功能。电路系统由秒信号发生器、时、分、秒计数器，显示器，校时电路组成。关键词计数秒脉冲  Digital Clock [Abstract]: With the?rapid development?of modern?electronic technology,?the corresponding?out?all kinds of?intelligent products?for?human life?has brought?tremendous?convenience.?Digital circuit?which?is?an important part of?intelligent?products.?Digital circuit?has a simple circuit, high reliability,?low cost, the?design of?digital?electronic?circuit?design?as the coreclock.?A?digital clock?is?the hour,?minute, second display?organ?in the human?visual timing device.?Its?time?period?is 24?hours, the?full scale?of?23:59:59,?while?the other school?should?function.?By the?second signal?generator?circuit system, hours, minutes, seconds?counter,?display,?timing?circuit. [Keywords]: Digital Clock；Counter；One second pulse  目录 1 前言............................................................. 1 1.1数字电子钟的现状........................................... 1 1.2设计目的................................................... 1 2 设计内容与要求................................................... 2 3 电路工作原理及分析............................................... 3 3.1数字钟的基本逻辑功能框图................................... 3 3.2秒信号发生器............................................... 3 3.3时、分、秒计数器电路....................................... 4 3.4校时电路................................................... 4 4 数字电路的设计................................................... 5 4.1 计数电路的设计............................................. 5 4.2 校时电路的设计............................................. 7 5主要芯片的技术参数............................................... 8 5.1 74LS90芯片................................................ 8 5.2 74LS290芯片............................................... 8 6 心得体会.........................................................10 参考文献....................................................