电子钟的设计电子钟需要一个时钟基准信号，产生基本的而且准确的计时单位，根据实验室的实际环境，我们可以设计一个变量来计算时钟基准信号的个数，来达到计时的目的。例如用计时器计1S，计数到60时可以产生1min的定时。然后计数器清零，分加1。循环反复计数。由此实现电子钟的设计。

对于能够调节分、秒值的电子钟，当触发某一按键时，通过执行相应的程序而去对分、秒值进行加减。

所以在这里把问题归结找到计时的基本单位，并编写对应按键的程序。

-The design of electronic clock electronic clock requires a clock reference signal to produce a basic and accurate timing units, according to the laboratory' s physical environment, we can design a variable to calculate the number of clock reference signal, to achieve timing purposes. For example, the timer count with 1S, count to 60 can produce 1min timing. Then the counter is cleared, points plus 1. Cycle repeated counts. Thus to achieve electronic clock design. Able to adjust for the minute and second values ​ ​ of electronic clock, when the trigger of a button, through the implementation of the corresponding program away for minute and second value addition and subtraction. So the problem boils down to find where the basic unit of time, and write the corresponding button of the program.