多功能数字钟课程设计

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1、目录设计任务·······························································1前言···································································31.设计目的····························································42.设计要求··············································

2、··············43.设计的总体方案······················································53.1系统基本方案选择与论证·········································53.1.1芯片的选择方案和论证······································53.1.2显示模块选择方案和论证····································53.1.3脉冲发生器的选择方案和论

3、证································63.1.4电路设计最终方案与系统组成框图····························63.21Hz标准脉冲发生器·············································63.3计数译码显示···················································73.4校正电路·················································

4、······7-20-4.单元电路的设计······················································74.1．振荡器与分频器的设计··········································74.2.计数器与译码器的设计··········································85．校时电路的设计·····················································136.结果分析

5、···························································157．设计小节···························································158.参考文献···························································16附录······························································

6、····16附录1：数字钟的主体电路逻辑图········································17附录2：所用元器件清单················································18附录3:数字钟的实物连线图············································19多功能数字钟前言-20-数字钟已成为人们常生活中必不可少的必需品，广泛用于个人家庭以及车站、码头、剧院、办公室等公共场所，给人们的生活、学习、工作、娱乐

7、带来极大的方便。由于数字集成电路技术的发展和采用了先进的石英技术，使数字钟具有走时准确、性能稳定、携带方便等优点，它还用于计时、自动报时及自动控制等各个领域。虽然现在市场上已有现成的数字钟集成电路芯片，价格便宜、使用也方便，但是这里介绍的自制数字电子表可以满足使用者的一些特殊要求，输出方式灵活，如可以随意设置时、分、秒的输出，改变显示数字的大小等等。并且由于集成电路技术的发展，特别是MOS集成电路技术的发展，使数字电子钟具有体积小、耗电省、计时准确、性能稳定、维护方便等优点。内容摘要：数字钟是一个将“时”、“分”

8、、“秒”显示于人的视觉器官的计时装置。电路由时钟脉冲发生器、时钟计数器、译码驱动电路和数字显示电路以及时间调整电路组成。用晶体振荡器产生时间标准信号，这里采用石英晶体振荡器。显示器件选用LED七段数码管。在译码显示电路输出的驱动下，显示出清晰、直观的数字符号。针对数字钟会产生走时误差的现象，在电路中就设计有有校准时间功能的电路。关键词：数字钟；分频器；计时器；译码器Abs