这将作为外部时钟的输入端。
它的功能是当感应到输入电压界限时提供一个锁存开关，通过外部时钟信号完成复位。
Its function is to provide a latching switch action upon sensing an input threshold voltage, with reset accomplished by an external clock signal.
许多时钟电路也与电阻器和电容器一起使用作为低成本的时间组分或驱动外部输入。
Many clock circuits also work with a resistor and capacitor as low-cost timing components or can be driven from an external source.
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