One way of explaining this is that pins configured as INPUT make extremely small demands on the circuit that they are sampling, say equivalent to a series resistor of 100 Megohms in front of the pin.

 
  • 我們可以這樣來(lái)理解,在取樣時(shí),只需要在電路中通過(guò)非常小的電量,就好比在該接口前放置了100歐姆的電阻。
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