Pull-up resistor 上拉电阻 ; 上拉电阻器 ; 提升电阻
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.
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10 K的电阻至电源作为上拉电阻。
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.
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。
This load is easier for power supply to start up than resistor load.
这种负载对开关电源来说要比电阻负载容易启动。
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