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一开始向455A发送F9 00 0C 40 34 6C 这帧数据是关断设备，那我该怎么walk_up设备呢？
在芯片进入了低功耗模式之后，通过WAKEUP管脚唤醒。
那请问，MCU和455A进行串口通信时，walk_up管脚是什么状态，两者之间才可以正常通信？
