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如题，能简单说明一下该引脚的功能就太好了，最好能讲下下该引脚是高电平的时候能烧录程序（或者说把芯片调整为可烧录程序的状态）吗？
您可以看一下数据手册的 8.1.9 Boot ROM，给出了SCI-A boot时需要的引脚电平
