数字电子钟的设计摘 要：数字电子时钟电路设计系统，以 AT89C51 单片机为控制核心，由键盘显示、定时闹铃、LED 共阴极数码管和 LED 灯显示等功能模块组成。基于题目基本要求，本系统对时间显示和定时报警进行了重点设计。本系统大部分功能由软件来实现，吸收了硬件软件化的思想，大部分功能通过软件来实现，使电路简单明了，系统稳定性大大提高。本系统不仅成功的实现了要求的基本功能，而且有一定的创新功能。关键字：单片机；AT89C51；数字钟Abstract：This digital electronic clock circuit design system ,based on chip microcomputer AT89C51,is composed by the following functional modules : keyboard displaying , timing alarmg. common cathode LED digital tube, LED lights display,and so on. According to the basic requirements of the subject ,the system stresses on the realization of Time display and regularly report to the design achieved all the required basic technical indexes. Furthermore , adopting the idea of hardware-to-software, most of those functions are realized by softwares, which makes the electrocircuit more concise and the system more stable.Key words：chip microcomputer；AT89C51：digital electronic clock目 录1 前言.......................................................................12 总体方案设计...............................................................23 系统硬件设计...............................................................2 单片机最小系统..........................................................2 输入部分................................................................4 电源模块............................................................4 按键模块............................................................4 输出部分................................................................4 显示模块............................................................4 LED 灯显示模块......................................................54 系统软件设计....................................
