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28377s boot mode的设置只可以用gpio72和gpio84;
而SCIA的两个TXD和RXD可以分别为84和85脚,这样使用的话是否会冲突
不冲突,板子上电后进入rom判断这两个io的电平,然后进入相应的引导模式后引脚功能就释放了。