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TCA9546A: 0x00寄存器读取出来的数值异常?

Part Number: TCA9546A

您好!
使用的TCA9546APWR芯片,在使用时想要查看开关切换到通道几了 ,去读取0x00返回的还是00不正常,我切换通道使用却又都是正常,且我写入0x00寄存器也正常,这是为什么?