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端口需要配置为漏极开路输出或集电极开路输出，请问该怎么用啊
没有相关的寄存器可以配置输出模式
You can program the GPIO to be input with 3-state (please refer to register PxDIR, PxINP) when you need open drain/collector.
If you want a logic low, you can program the GPIO to be output low.(please refer to register PxDIR, Px)
