设计一个以AT89S51单片机为核心的数字电子钟控制器，实现电子钟的时间、日期交替显示、闹钟功能，并可通过按钮开关或键盘切换显示内容、调整参数、设置闹钟，在单片机实验板上模拟调试实现控制器的功能。-To design a digital electronic clock with AT89S51 as the core controller, realize electronic clock time, date, alternate display, alarm clock function, and can through the button or keyboard switch display content, adjust parameters, set the alarm clock, on the single chip microcomputer experiment board simulation debugging, we can realize the function of the controller.