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AWCC寄存器的WPbit置0，是不是表示ARDY处于disabled状态？
不是，是用来定义信号极性的，如果不用，可以通过上拉或者下拉电阻将其置于固定ready状态。
Asynchronous ready (AARDY) pin polarity. Defines the polarity of the AARDY pin.
1 AARDY pin is active-high (strobe period extended when AARDY is high)
0 AARDY pin is active-low (strobe period extended when AARDY is low)
