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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1065130/tca9555-reading-the-state-of-an-output
在配置为输出的引脚上、您能否读取该引脚的当前状态？
数据表的第9.6.1节指出：
表4中显示的输入端口寄存器(寄存器0和1)反映了引脚的传入逻辑电平、而不管引脚是由配置寄存器定义为输入还是输出。
