本设计的数字时钟利用 51 单片机作为核心芯片，辅以按键、蜂鸣器和LED显示器，以实现具有计时、校时、闹钟设定等功能。利用单片机实现的数字时钟具有编程灵活，便于功能的扩充等优点。-51 single-chip digital clock in this design as the core chip, combined with the buttons, buzzer and LED display, in order to achieve timing, timing, alarm settings and other functions. MCU digital clock with flexible programming, and facilitate the expansion of the function. with alarm