通过利用STC实验板，设计并实现闹钟功能。利用uart串口通信向单片机发出指令，既闹钟设定的时间，闹钟设定时间事实显示在数码管后四位上，数码管灯前四位为当前时间，当前时间可通过adc键盘前四个按键来调节，分别为小时＋，小时－，分钟＋，分钟－。最后当当前时间到达闹钟设定时间时，led灯以0.5秒一次的频率闪烁，直到当前时间跳过闹钟设定时间。(Through the use of STC experimental board, the design and implementation of alarm clock function. The use of UART serial communication sent to the single-chip instruction, both set the alarm time, the alarm set time in the digital tube display four digital tube lights, four for the current time, the current time can be adjusted by the ADC keyboard four buttons, respectively, when the small hours +, -, + - minutes, minutes. Finally, when the current time reaches the set time of the alarm clock, the LED light blinks at the rate of 0.5 seconds until the current time skips the setting time of the alarm clock.)