系统从主控制器AT89C51，时钟电路DS1302，显示电路，按键电路和复位电路元件，能实现时钟日历显示功能，可以是小时，分钟，秒显示。-System from the main controller AT89C51, clock circuit DS1302, display circuit, key circuit and reset circuit components, to achieve clock calendar display function, can be hours, m