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28335对应GPIO87 GPIO86 GPIO85 GPIO84为高电平的时候才能从flash启动，那么如果我直接悬空可行吗？看资料这4个IO口在上电的时候有内部上拉电阻，理论上悬空的时候一上电就是内部上拉电阻拉高这4个脚。我想知道这里悬空行不行。
