这个常量定义了上拉电阻是连接到哪个口的。
This constant defines the port on which the pullup resistor is connected.
主机设计者有责任给这些连接线加上外接的上拉电阻。
It is the responsibility of the host designer to connect external pullup resistors to those lines.
所述阻抗匹配电路包括第一下拉电阻单元、第一上拉电阻单元和码产生单元。
The impedance matching circuit includes a first pull-down resistance unit, a first pull-up resistance unit, and a code generation unit.
如果IC2包括内置的上拉电阻，就可以忽略电阻r 3，许多现代微处理器都是这样的。
Omit resistor R3 if IC2 includes built-in pullup resistors, as do many modern microcontrollers.
而C1的正向不能立即改变极性，其被拉低并通过输入的内部上拉电阻，缓慢的再次充电。
Because the positive side of C1 cannot instantly change its polarity, it pulls low and slowly charges up again through the internal pullup resistor of the input.
P 2口连接8个一端接地的按键作为输入，当然也需要连接8只10K的电阻至电源作为上拉电阻。
P2 port connector at one end grounded keys 8 as input, of course, need to connect 8 10k resistor to the power supply as the pull-up resistor.
所述第一上拉电阻单元向所述第一节点提供电源电压，由此确定在所述第一节点上的初始上拉码或电压电平。
The first pull-up resistance unit supplies a supply voltage to the first node, thereby determining an initial pull-up code or a voltage level on the first node.
当选择上拉(或向下)电阻时，要小心考虑电阻的大小。
Careful consideration must be used when selecting pull_up (or down) resistors.
当选择上拉(或向下)电阻时，要小心考虑电阻的大小。
Careful consideration must be used when selecting pull_up (or down) resistors.
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