数电课程设计秒计时器

课程设计任务书

学生姓名：专业班级：

指导教师：工作单位：

题目: 30秒计时器

电路设计

摘要 (1)

Abstract (2)

1系统原理框图 (2)

2方案设计与论证 (2)

2.1秒脉冲发生电路 (4)

2.2控制电路 (5)

2.3计数电路 (7)

2.4译码及显示单元电路 (8)

2.5报警电路................................................................................................................. 错误!未定义书签。3单元电路的设计. (11)

3.1秒脉冲产生电路的设计 (11)

3.2计数电路的设计 (11)

3.3控制电路的设计 (13)

3.4译码及驱动显示电路设计 (12)

3.5 报警电路 (16)

3.6 电路总图 (14)

4仿真结果及分析 (15)

4.1 时钟结果仿真........................................................................................................ 错误!未定义书签。

4.2 秒钟个位时序图.................................................................................................... 错误!未定义书签。

4.3报时电路时序图..................................................................................................... 错误!未定义书签。

4.4测试结果分析......................................................................................................... 错误!未定义书签。5心得与体会........................................................................................................................ 错误!未定义书签。6参考文献 (17)

摘要

计时器在人类生活中有着非常重要而广泛的应用，古时候人们就开始用沙漏和水漏做定时工具，随着科技和社会的发展，人们开始用全新的方法来改造计时器以达到准确计时的目的。

篮球竞赛计时器就是一种典型的计时器的应用。在篮球比赛中规定球友持球的时间不能超过30秒，否则就是犯规。本课程设计的“篮球竞赛30秒计时器”，可用于篮球比赛中，用于对球员持球时间进行30秒限制，一旦球员持球的时间超过了30秒，它将自动报警从而判定刺球员的犯规。

本文设计用的是实现以中小规模集成电路设计计时器的方法，它是一种典型的数字电路，其中包括了组合逻辑电路和时序电路。它是由时钟脉冲产生电路、计数电路、译码驱动及显示电路、报时电路及电源电路组成。时钟脉冲采用555定时器构成多谐振荡电路产生，。。。。通过EDA软件Multisim10绘制了电子电路仿真原理图，并进行仿真，同时用万能板焊接制作了硬件实现电路。

Abstract

Clock ，as we all know，is widly and importantly used in human life.in ancient,our ancestor

began to use sandglass and hourglass as timework,but,with the fast development of science and sociaty,people start using all new method to change out clock and make it more exacat.

Basketball game is a particular field to use clock.there is a rule in basketball game that player can’t hold the ball exceed 30 seconds,otherwise it is a foul.”the 30 seconds clock in basketball game”designed in my course design can used in badketball game,to limited players hold the ball in 30seconds.ones players hold ball

over 30 seconds it will give an alarm by itself to judge the player is foul.

What the paper use is the design to realize medium scale with integrated circuit design method, it is a kind of typical digital circuits, including the portfolio logic circuit and the sequential circuits.It is constitute by the clock pulse circuits, counting circuit, decode drive and display circuit, chime circuit and power circuit component. Clock pulse 555 timing constitute by multiple resonance swing circuit produce,... we draws electronic circuit simulation principle chart and simulation through Multisim10 EDA software, at the same time we use the universal plate welding to made hardware realization circuit.

1系统原理框图

图1系统原理框图

秒脉冲发生器计时器译码显示电路

控制电路报警电路

外部操作开关

一．1秒脉冲发生器：秒脉冲信号发生器需要产生一定精度和幅度的矩形波信号。实现这样矩形波的方法很多，可以由非门和石英振荡器构成，可由单稳态电路构成，可以由施密特触发器构成，也可以由555点哭构成等。