说明：  本项目设计采用了6位数码管显示电路，在设计6位LED显示时，为了简化电路，降低成本，采用动态显示的方式，6个LED显示器共用一个8位的I/O，6位LED数码管的位选线分别由相应的P2.0--P2.5控制，而将其相应的段选线并联在一起，由一个8位的I/O口控制，即P0。译码显示电路将“时”，“分”，“秒”计数器的输出状态经显示译码器译码，通过6位LED七段显示器显示出来。达到定时电路时根据计时系统的输出状态产生的一个脉冲信号，然后去触发蜂鸣器发生器来实现闹铃。校时电路是用来对“时”，“分”，“秒”显示数字进行校对调整的。压缩文件中的仿真文件可以用Proteus查看。
(The project was designed with six digital tube display circuit, in the design of six LED display, in order to simplify the circuit, reduce costs, dynamic display mode, 6 LED displays share one 8-bit I/O, 6 Wei LED Digital Choice of line pipe by the corresponding P2.0- P2.5 control, whereas the corresponding segment of its alignment parallel together by an 8-bit I/O port control, that is, P0. Decode display circuit will be "time", "sub", "seconds" counter output state by the display decoder decoding, through the six LED seven-segment display is displayed. To achieve timing circuit timing system according to the output of the state generated by a pulse signal, and then to trigger generator to achieve the alarm buzzer. The school when the circuit is used to "time", "sub", "seconds" display figures proofreading adjusted. Compressed file in the simulation files can be used Proteus view)