说明：  【设计题目】 多功能数字钟的设计 【设计目的】 1掌握数字系统的分析和设计方法 2能够熟练的、合理的选用集成电路器件 3熟悉EWB软件的使用。 【设计指标及要求】 设计一个多功能数字钟，以一昼夜24小时为一个计数周期。准确计时，具有“时”“分”“秒”数字显示。整点能自动打点、报时。要求报时声响四低一高，最后一响为整点。具有校时功能。要求电路主要采用中小规模CMOS集成电路。要求电路尽量简化，并选用同类型的器件。在EWB电子工作平台上进行电路的设计和计算机仿真。
(Title] [design multi-functional digital clock design 1] [designed to exploit the digital system analysis and design method of 2 to skilled, reasonable choice of integrated circuit device 3 familiar with the EWB software. [] Design specifications and requirements to design a multi-function digital clock, 24 hours a day for a cycle count. Accurate time, a when sub seconds The figures show. Automatically runs the whole point, the newspaper. Four-time low noise requirements of a high, the final point for the whole ring. With a school function. Requirements are mainly small and medium-sized circuits CMOS integrated circuits. Asked the circuit as simple as possible and select the same type of device. EWB work in the platform of electronic circuit design and computer simulation.)