说明：  本作品是基于单片机的个性化电子钟设计，它包括了4位LED数码显示管、8个LED灯、一路蜂鸣器和三个控制按键。三个控制按键中，K1是模式变换按键，K2是“+” 按键，K3是“-” 按键。
(This work is a personalized electronic clock microcontroller-based design, which includes four LED digital display tube, the 8 LED lights, all the way to the buzzer and three control buttons.The three control buttons, the K1 is the mode change key, K2 is the "key, K3 is"- "button. )