多功能数字钟的电路设计报告书.pdf
数字电子技术课程设计第 1 页 共 10 页课程设计专用封面设计题目：数字钟所修课程名称：电子课程技术课程设计修课程时间：2009 年 12 月 07 日至 2009 年 12 月 18 日完成设计日期：2009 年 12 月 18 日评阅成绩：评阅意见：评阅教师签名：年月日_工学院_学院_2007_级_电气及其自动化专业姓名_学号_（密）（封）（线）数字电子技术课程设计第 2 页 共 10 页多功能数字钟的课程设计一、设计题目：多功能数字钟的电路设计二、设计要求：1.能直接显示时、分、秒的数字钟，要求二十四为一计数周期。2.当电路发生走时误差是具有快速校准时、分、秒的功能。3.整点自动报时，在离整点10s 时，便自动发出鸣叫声，步长10s，当鸣声结束时正好为整点。4.要求电路主要采用中规模集成电路，电源电压+5V.三、题目分析：数字电子钟由信号发生器、“时、分、秒”计数器、译码器及显示器、校时电路、整点报时电路等组成。秒脉冲发生器是数字钟的核心部分，它的精度和稳定度决定了数字钟的质量，在此次实验中用 555 定时器来实现。将标准秒脉冲信号送入“秒计数器”，该计数器采用60 进制计数器，每累计60 秒发出一个“分脉冲”信号，该信号将作为“分计数器”的时钟脉冲。“分计数器”也采用60进制计数器，每累计60 分，发出一个“时脉冲”信号，该信号将被送到“时计数器”。“时计数器”采用24 进制计数器，可以实现一天24h 的累计。译码显示电路将“时、分、秒”计数器的输出状态经七段显示译码器译码，通过六位LED显示器显示出来。为了使数字钟的功能更加完善，增加了整点报时环节和校时环节。整点报时电路是根据计时系统的输出状态产生一个脉冲信号，然后去触发音频发生器实现报时。校时电路是来对“时、分、秒”显示数字进行校对调整四、总体方案：此次设计大概可以分五个部分：秒脉冲产生部分、计数部分、显示部分、校时部分、报时部分。在秒脉冲产生部分中，用555 定时器予以实现，通过调节电阻的大小最后得到我们所需要的秒脉冲；在计数电路中，我们采用74LS90这种二-五-十进制计数器，因为它可以同时可以级连组成60进制和 24 进制，用起来比较方便；用 74LS90、CC4511译码器和七段显示数码管便组成多功能数字钟的显示部分；在校时部分中，我们选用的是手动校时的方式，通过按钮产生脉冲来控制 74LS90的计数，从而达到计数的目的；在最后的报时部分中，采用逻辑门电路、数据选择器74LS151和 74LS00门电路组成控制电路和蜂鸣器加以实现。通过以上几个部分的共同作用，最终达到该项设计的所有要求，设计出一个多功文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7数字电子技术课程设计第 3 页 共 10 页能数字钟。下图为数字钟总设计结构图：图 1 总设计结构图五、具体实现：(1)秒脉冲产生部分（555 定时器）本设计方案使用555 多谐振荡器来产生1HZ 的信号。通过改变相应的电阻电容值可使频率微调，不必使用分频器来对高频信号进行分频使电路繁复。虽然此振荡器没有石英晶体稳定度和精确性高，由于设计方便，操作简单，成为了设计时的首选，但是由于与实验中使用的555 芯片产生的脉冲相比较，利用晶振产生的脉冲信号更加的稳定，通过电压表的测量能很好的观察到这一点，同时在显示上能够更加接进预定的值，受外界环境的干扰较少，一定程度上优于使用555芯片产生信号方式。最终我们选择了 555 定时器作为秒脉冲发生器。在 555定时器的外部接适当的电阻和电容元件构成多谐振荡器，再选择元件参数使其发出标准秒信号。555定时器的功能主要由上、下两个比较器1、2 的工作状况决定。若复位端 加低电平或接地,可使电路强制复位,不管 555 电路原处于什么状态,均可使它的输出为“0”电平。只要在555 定时器电路外部配上两个电阻及两个电容元件,并将某些引脚相连,就可方便地构成多谐振荡器。文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7数字电子技术课程设计第 4 页 共 10 页84351672555UCCuOR1R2C555 是数字钟脉冲产生的核心部分。为了保证脉冲的准确性与稳定性，R1和R2采用可调电阻，经过不断的调试，R1的阻值大约在 15K左右，R2的电阻大约在 68K左右，电容 C大小为 10uF，经过多次调试后可以得到频率为1Hz的秒脉冲，并将其作为整个多功能数字钟的脉冲源，作为计数器计数等功能之用。(2)计数部分74LS90是二-五-十进制异步计数器，它有两个时钟输入端BACPCP 和。其中，ACP和0Q组成一位二进制计数器；BCP和210QQQ组成五进制计数器；若将0Q与BCP相连接，时钟脉冲从ACP输入，则构成了 8421BCD 码十进制计数器。74LS90具有异步清零和异步置九功能。当R0 全是高电平，R9 至少有一个为低电平时，实现异步清零。当 R0 至少有一个低电平，R9 全是高电平时，实现异步置九。当R0、R9 为低电平时，实现计数功能。所以74LS90有两个清零端)1(0R、)2(0R，两个置 9 端)1(9R和)2(9R，其引脚图和功能图明细见下图。输入输出文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7数字电子技术课程设计第 5 页 共 10 页图 4 计数器 74LS90 的引脚图和完全功能表对于设计所需的六十进制和二十四进制，通过下图所示的计数器和门电路综合控制的方法达到该要求。在六十进制的秒和分表示中，需要在秒和分的十位出现 0110 的时候便通过门电路进行反馈清零；在二十四进制时中表示中，需要将十位的第三高位(即 B端)和各位的第二高位(即 C端)接入门电路的输入端，于是当时的计数达到0010 0100 的时候便通过反馈清零。具体实现图示如下：图 5 计数电路部分(3)显示部分译码器是一个多输入、多输出的组合逻辑电路。它的工作是把给定的代码进行“翻译”，变成相应的状态，使输出通道中相应的一路有信号输出。译码器在数字系统中有广泛的用途，不仅用于代码的转换、终端的数字显示，还用于数字分配，存储器寻址和组合控制信号等。译码器可以分为通用译码器和显示译码器两大类。在电路中用的译码器是共阴极译码器CC4511，用 CC4511 把输入的8421BCD 码 ABCD 译成七段输出ga，再由七段数码管显示相应的数（所显示的R01 R02 R91 R92 Qd Qc Qb QA H H L H H L L H H L H H L L L L L L L L H L L H H L L H L L L L L L L L 计数计数计数计数文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7数字电子技术课程设计第 6 页 共 10 页数为十进制数字）。所使用的共阴极译码器CC4511的引脚图和完全功能图如下：图 6 译码器 CC4511的引脚图和完全功能表在该设计的具体实现过程见下图：图 7 显示电路部分(4)校时部分分析整个电路图可知：校时部分原理非常简单，只需要两个单刀双置开关即可实现，开关始终接通的端口与下一需要输进脉冲的端口相连，开关的两个选择端口一个连接正常进位的脉冲输出端，另外一端则直接与脉冲源连接。当开关位于正常进位脉冲端时，整个数字钟正常工作，当开关位于直接连接脉冲源端时，分或时不再受进位脉冲的影响，而直接受脉冲源控制，此而完成校时的功能。文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7数字电子技术课程设计第 7 页 共 10 页图 8 校时电路部分(5)报时部分报整点时数电路的功能是：每当数字钟计时将要到整点时发出音响，点响几。要达到在离整点10s 时便自动发出鸣叫声，持续时间为10 秒，当报时结束为整点这个目的，由下表可以知道当时间在XX:59:50 的时候开始报时，用二进制表示出进行报时的时间为：ACP输出分 8 位(07QQ)秒 8 位(07QQ)1 0101 1001 0101 0000 表 1 报时电路真值表分析上表可知，当分的Q6,Q4,Q3,Q0 和秒的 Q6 Q4皆为高电平时，进行报时。报时部分的 74LS151是八选一数据选择器，它有三个地址输入端A2、A1、A0,八个数据输入端D0D7，两互补输出的数据输出端，下图为其引脚图：文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 ZE7W2N2T5R7文档编码:CC10L7A5U5V9 HS1X8T1C8R2 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