Use AT89S51 single chip and real-time clock integrated circuit DS1643, designed an electronic clock system, realized the date, time display and reported time.

利用AT 89s51单片机及实时时钟集成电路ds1643，设计了一个电子钟系统，实现了日期、时间显示及报时功能。

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This integrated circuit control the frequency and pulse width of the high voltage IC output signal conveniently by adjusting the input date of IC digital input port.

该集成电路通过对数字输入端口的输入数据的调节，灵活的控制了高压开关集成电路输出信号的频率和脉宽。

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Explicated the structure and principle of work of ultrasonic launching and receiving circuit, presented the program frame and part program of the date processing.

并对超声波发射接收电路的硬件结构和工作原理做了较详细的说明，给出了数据处理系统程序框图和部分程序。

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Patrick has had limited success in her part-time Nascar career to date on the JV Nationwide circuit.

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The 2011 MLG Pro Circuit season was the 8th and most successful to date reaching more than 3.5 million unique stream viewers during combined Pro Circuit weekends.

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There has been no announcement yet on whether the race will be held at a later date, though chairman of the Bahrain International Circuit Zayed R.

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