led显示电子钟设计大学毕设论文

XX学院课程设计论文论文题目：数字电子钟的设计姓名：所在院系：电信学院班级：学号：指导教师：XX学院二〇一三年一月六日摘要单片机又称单片微控制器，它不是完成某一个逻辑功能的芯片，而是把一个计算机系统集成到一个芯片上。

概括的讲，一块芯片就成了一台计算机。

单片机具有体积小、功能强、应用面广等优点，为学习、应用和开发提供了便利条件。

现在，这种单片机的使用领域已十分广泛。

彩电、冰箱、空调、录像机、VCD、遥控器、游戏机、电饭煲等无处不见单片机的影子，单片机早已深深地融入我们每个人的生活之中。

单片机能大大地提高这些产品的智能性，易用性及节能性等主要性能指标，给我们的生活带来舒适和方便的同时，在工农业生产上也极大地提高了生产效率和产品质量。

此外，单片机在工商、金融、科研、教育、国防航空等领域都有着十分广泛的用途。

数字钟是采用数字电路实现对“时”、“分”、“秒”数字显示的计时装置。

该课程设计为数字电子钟的设计。

以AT89C51为核心，配合LED 数码管显示器和按键为用户提供长期、连续、可靠、稳定的工作环境。

该数字电子钟有时分秒显示和日期显示以及时间和日期调整的功能。

系统软件设计包括单片机计算机两部分的编程。

计算机软件编程主要实现参数设置、串行口数据接收、指令发送以及数据的显示和存储。

单片机软件编程主要实现键盘、LED显示等各模块的功能，采用汇编语言编程。

数字钟是其小巧，价格低廉，走时精度高，使用方便，功能多，便于集成化而受广大消费的喜爱，因此得到了广泛的使用。

关键词数字电子钟；单片机；LED显示第一章设计目的和方案 (4)1.1设计任务 (4)1.1.1 设计题目：数字电子钟 (4)1.1.2 设计目的与任务 (4)1.2功能要求说明 (4)1.3设计总体方案及工作原理 (5)第二章数字电子钟的硬件系统的设计 (6)2.1 硬件系统各模块功能设计 (6)2.1.1 单片机最小系统 (6)2.1.2 键盘模块 (6)2.1.3 LED显示电路 (6)2.1.4 接口电路 (7)2.2 电路原理图、PCB图和元器件布局 (7)2.3 元器件清单 (8)第三章数字电子钟的软件系统的设计 (8)3.1 使用的单片机资源的情况 (8)3.2 各模块功能简要介绍 (8)3.3 程序的流程图 (9)3.4 程序清单 (12)第四章设计仿真和结果分析 (13)4.1 设计结论和功能使用说明 (13)4.1.1 设计结论 (13)4.1.2 功能及使用说明 (13)4.2 仿真结果 (14)4.3 设计系统误差分析 (16)第五章设计小结 (16)致谢 (17)参考文献 (18)附录 (20)第一章设计目的和方案1.1设计任务1.1.1 设计题目：数字电子钟1.1.2 设计目的与任务通过理论设计和实物制作解决相应的实际问题，巩固和运用在《单片机原理及接口技术》中所学的理论知识和实验技能，掌握单片机应用系统的一般设计方法，提高设计能力和实践动手能力，为以后从事电子电路设计、研发电子产品打下良好的基础。

数字钟毕业论文数字钟毕业论文一、引言在现代社会中，数字钟已经成为人们日常生活中不可或缺的一部分。

无论是手机、电脑还是家居装饰，数字钟都无处不在。

然而，数字钟的发展背后隐藏着许多有趣的技术和设计原理。

本篇论文将探讨数字钟的历史、工作原理以及未来发展方向。

二、历史回顾数字钟的历史可以追溯到20世纪70年代。

当时，电子技术的快速发展使得人们开始尝试用数字显示时间。

最早的数字钟采用了七段显示器，通过控制灯泡的亮灭来表示数字。

然而，这种显示方式存在一些问题，例如能耗较高、显示效果不够清晰等。

随着技术的不断进步，液晶显示器逐渐取代了七段显示器，成为数字钟的主流显示技术。

液晶显示器具有低能耗、高对比度和可定制性等优点，使得数字钟的显示效果得到了极大的提升。

三、工作原理数字钟的工作原理可以简单地分为三个部分：时钟芯片、显示器和控制电路。

时钟芯片是数字钟的核心部件，它负责计时和时间的精确控制。

时钟芯片通常由晶体振荡器和计数器组成。

晶体振荡器产生稳定的振荡信号，计数器将振荡信号转换为可读的时间格式。

显示器是数字钟的输出部分，它用来显示时间。

除了液晶显示器，数字钟还可以采用LED显示器等其他技术。

不同的显示器技术有不同的特点，例如LED显示器亮度高、反应速度快，而液晶显示器则更加省电。

控制电路负责接收用户的输入，并将其转化为对时钟芯片和显示器的控制信号。

用户可以通过控制电路来调整时间、设置闹钟等功能。

四、数字钟的应用领域数字钟在日常生活中有着广泛的应用。

首先，数字钟作为时间的显示工具，被广泛应用于办公室、学校、医院等场所。

其次，数字钟还可以作为家居装饰品，为室内空间增添一份现代感。

此外，数字钟还可以用于计时器、闹钟等功能，方便人们的生活。

除了日常应用，数字钟在科学研究、航空航天等领域也有着重要的作用。

例如，在航空航天领域，数字钟的精确计时能力对于飞行任务的安全和准确性至关重要。

五、数字钟的未来发展随着科技的不断进步，数字钟的未来发展前景广阔。

16位LED显示电子钟设计摘要随着半导体技术的飞速发展,以及移动通信、网络技术、多媒体技术在嵌入式系统设计中的应用,单片机从4位、8位、16位到32位,其发展历程一直受到广大电子爱好者的极大关注。

单片机功能越来越强大,价格却不断下降的优势无疑成为嵌入式系统方案设计的首选,同时单片机应用领域的扩大也使得更多人加入到基于单片机系统的开发行列中,推动着单片机技术的创新进步。

然而传统的单片机系统开发除了需要购置诸如仿真器、编程器、示波器等价格不菲的电子设备外,开发过程也较繁琐。

来自英国Labcenter Electronics 公司的Proteus软件很好地诠释了利用现代EDA工具方便快捷开发单片机系统的优势。

它包括PROTEUS VSM(Virtual System Modelling)、PROTEUS PCB DESIGN 两大组成部分,在PC机上就能实现原理图电路设计、电路分析与仿真、单片机代码级调试与仿真、系统测试与功能验证以及形成PCB文件的完整嵌入式系统设计与研发过程。

单片机系统作为一种典型的嵌入式系统,其系统设计包括硬件电路设计和软件编程设计两个方面, 其调试过程一般分为软件调试、硬件测试、系统调试3个过程。

如果采用单片机系统的虚拟仿真软件??Proteus,则不用制作具体的电路板也能够完成以上工作。

关键词: 数字电子钟 STC89C52 LED 电子钟ABSTRCTWith the rapid development of semiconductor technology, and mobile communication, network technology, multimedia technology in embedded system design application, SCM from the4,8,16bit to 32 bit, its development course has been subject to the vast majority of electronic enthusiasts attention. Single chip computer is becoming more and more powerful, the price drops ceaselessly however advantage undoubtedly become embedded system design is preferred, while MCU application fields expand also makes more people to join the ranks of the development of SCM system based on SCM technology, promote innovation and progress.However, the traditional single chip microcomputer system development in addition to the need to purchase such as emulators, programmer, oscilloscopes and other expensive electronic equipment, the development process is tedious. From the UK Labcenter Electronics Proteus software, a good interpretation of the use of modern EDA tool convenient and quick development of the advantages of SCM system. It includes the PROTEUS VSM Virtual System Modelling , PROTEUS PCB DESIGN two components, in the PC machine can realize the schematic circuit design, circuit analysis and simulation code, debug and simulation, system testing and verification as well as the formation of PCB file full embedded system design and development process.SCM system as a typical embedded system, the system design including the hardware circuit design and software programming of two aspects ofthe design, the debugging process is generally divided into software debugging and hardware testing, system testing process of 3. If the use of single-chip microcomputer system of the virtual simulation software -- Proteus, without making specific circuit board also can be done.Keywords: digital electronic clock STC89C52LED electronic clock摘要 1ABSTRCT 1第一章绪论 11.1 设计背景 11.2 设计简介 11.2.1 电子钟简介11.2.2 电子钟的应用及发展 2第二章方案对比确定 32.1 主控芯片的选择 32.1.1 ATmega8简介 32.1.2 AT89S52简介 32.1.3 STC89C52简介 42.2 时钟芯片的选择 42.2.1 DS12887简介 42.2.2 DS1302简介 52.3 显示系统的选择 62.3.1 LED优势 62.3.2 LED显示屏 62.4 系统总体方案介绍 6第三章硬件电路设计93.1 Proteus 电路图设计9 3.2 原理图设计103.3 PCB图设计 10第四章系统软件设计134.1 概述134.1.1 主程序 134.1.2 调时程序134.1.3 LED显示模组显示数字13 第五章程序设计175.1 程序预览17结论25致谢27参考文献29绪论设计背景随着半导体技术的飞速发展,以及移动通信、网络技术、多媒体技术在嵌入式系统设计中的应用,单片机从4位、8位、16位到32位,其发展历程一直受到广大电子爱好者的极大关注。

Design and Simulation of LED Clock Circuit Based on Proteus Abstract：Based on the Proteus simulation software, the circuits of MCV controlling LED clock have been designed. The circuits include four parts: Hardware design, software programming, software simulation and physical display. Eventually, through the Proteus software simulation and physical display prove that the method of the circuit design is correct. This paper systematically introduces the design method of MCV controlling circuits and provides a complete design idea for the design of display circuit.Keywords：Proteus; LED; clock circuitI. INTRODUCTIONProteus is EDA software developed by the UK Labcenter Company, which can not only realize fundamental circuit simulation, but also simulate, debug MCU and peripheral circuits. With the Proteus powerful simulation capabilities and extensive resource libraries,the design process of hardware circuit can be effectively simplified. The Proteus simulation software can be firstly used in the design, simulation and debugging of the hardware circuit. When the results reach the demand, the physical circuits would been finally set up and debugged.This makes sure not only a high effective, low invested circuit design but also reduces the loss caused by burning of debugging in practice . In addition, it has also provided an effective design approach for hardware circuit design under scarce resource conditions in laboratory.II. HARDWARE DESIGN80C52 is the control center of the whole hardware circuit. PO pins connect with six LED nixie tubes through two latches 74HC573 respectively. P2.6 and P2.7 in P2 pins of 80C52 respectively control the nixie tube segments elected and bit-selected signals. The "Key" connects with the P3.7 pin, which can clear the display . Six nixie tubes are divided into three groups from left to right,which presents respectively: hour (Hour_H, Hour_L),minute(Min_H, Min_L), second (Sec_H, Sec_L) ; PO pins connect with 74HC373 through external pull-up resistors;Using two latches is mainly to save 80C52 port resources, in order to facilitate follow-up development of circuit design. Peripheral circuits include input power circuit, power supply filter circuit, reset circuit and the LED indicating circuit and so on. The whole hardware circuits have been displayed in figure .Figure 1. LED clock circuitsIII. SOFTWARE DESIGNThrough using C language to control each pin of the 80C52 MCU, the designed circuits are required to achieve the electronic clock function. The display contents of LED nixie tubes "0-9" are coded according to "a-h" display segments, which could control segment selection and bit selection through the pins P2.6 and p 2.7. When P2.6 = I,the segment selection is selected, then the output data through PO connect to "a-h" of nixie tubes in order to achieve the corresponding display, finally commanding P2.6 = 0 to close the latch; when P2.7 = 1, the bit selection is selected, then the output data through PO connect to six nixie tubes in order to control which one to display, finally commanding P2.7 = 0 to close the latch.That means, segment selection P2.6 achieves the control for the display; while, bit selection P2.7 controls the bit of nixie tubes.The designed electronic clock program includes two key points: (1) timer settings. The display time of nixie tube is controlled according to the delay time of second hand; (2) counter settings. When the second hand, minute hand counts to 60, respectively, it starts to carry and clear;it starts to clear when the hour hand counts to 24.The clock control programming can be designed trough two ways: (1) Using delay function controls second hand to count. In the Keil 11 Vision2 software virtual environment, it debugs the delay function and sets the delay parameter just for a second, and then setting the count methods of second hand, minute hand and hour hand. Advantages of this method are simple and easy to understand, easy to implement, a little knowledge points involved; drawback is that some delay error exits during counting time. (2) The internal microcontroller timer counter tImmg. Advantages of this method are time accurate, error small; drawback is difficult to achieve,hard to understand, much knowledge involved. By contrast, the two methodsof time-setting having been used demonstrate their advantages and disadvantages in order to provide a theoretical reference for the software design in future. Keil llVision2 software compiler interface is compiled successfully and displayed in Figure 2 ("0 errors" and "0 warnings"). It generates .HEX hexadecimal file for the next step of the simulation.IV. SIMULATION AND PHYSICAL DISPLAYUnder the control of C language to each pin of MCU 80C52, after the success of Keil 11 Vision2 software compile, .HEX hexadecimal file generates. In Proteus7.5 simulation software, according to circuit principle and structure displayed in Figure 1, it draws a complete circuit.Then downloading .HEX file to the MCU obtains the simulation results as displayed in Figure 3[41. In this figure,"7SEG-MPX6-CC-BLUE" module has been selected as the six LED nixie tubes, the former two bits display "hour", the middle two bits display "minute", and the last two bits display "second". When pressing the button key,the nixie tubes display will be cleared, then re-timing.Changing the value of timer or delay in programs, it can change the clock speed and realize the function of stopwatch. In order to further verify the accuracy of programming and hardware circuit design, it obtains the display effectiveness shown in Figure 4 through downloading .HEX file to MCU. Finally, it verifies the correctness of whole circuit design by Proteus simulation and physical display.Figure 3. Proteus software simulationV. CONCLUSIONThis paper has systematically studied MCU controlling electronic clock circuit from the perspectives:hardware circuit, software programming, software simulation and physical display. The whole circuit is simple, function expandable and display flexible. In this paper, it verifies the correction of programming design and circuit design through software simulation and physical display. Putting the Proteus simulation software into simulation ofMCU avoids a series of processes in thetraditional directly applying hardware-kind design, building, debugging, simulation, plate-making, welding,etc, which could not only shorten the development cycle of circuit design, reduce the dissipation of component burnout in debugging process, but also cast off the restrictions due to incomplete laboratory hardware resource. Putting Proteus virtual simulation technology into the Meu control circuit design has some theoretical and practical significance.基于Proteus的LED时钟电路设计和仿真摘要：基于Proteus仿真软件，主控制电路的时钟电路设计。