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

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。

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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.

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。

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Based on real time clock of GPS system, and by means of absolute time-marker, real time data acquisition between different sites was performed in the form of wireless.

以GPS系统实时时钟为基础，通过对绝对时标加以处理，以无线方式实现了不同站点之间的实时数据采集。

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