系统能够实现自动化灌溉，具有排水警示、实时时钟、历史数据查询、数据上传及双向通信等功能。

And, the system can realize functions of automatic irrigation, drainage warning, real time clock, historical data inquiry, data up-transmission and two-way communication.

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同时给出了一种提高实时控制精度的有效方法，即通过改写系统定时器的分频值达到改变定时器时钟中断频率的值。

And it presents a efficacious method to enhance precision of real time control, which changes value of clock interrupt frequency by changing divided frequency of system tinier.

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在实时控制系统中，时钟控制电路及程序的设计十分重要。

In real time control system, it is important to design the clock control circuit and program.

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