Motherboard digital input port: the instrument main board provides 3 programmable input port. receives the passive contact switch signal.
主板数字输入端口．仪表主板提供3个可编程输入端口，接收无源触点开关信号。
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。
Port P1 through key input loop detection value, and then use digital output, no key is pressed the original value unchanged.
通过循环检测P 1口按键输入值，然后用数码管输出，没有按键按下时原值不变。
Port P1 through key input loop detection value, and then use digital output, no key is pressed the original value unchanged.
通过循环检测P 1口按键输入值，然后用数码管输出，没有按键按下时原值不变。
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