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关于电气特性的疑问

用户手册中的输入电流 IIH  IIL    输出电流 IOH  IOL中,当我选择DSP2812的捕获引脚的时候,我应该考虑哪个参数?IIL和IIH?  但是这个只有几微安。不知道怎么理解