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1. IO引脚的上下拉配置与端口是否设置为输入还是输出有关吗？
2. 输入有几个状态（上拉输入，下拉输入，浮空输入？），输出有几个状态（漏极开路输出，推挽输出？）
1. 没有关系。
2. IO管脚的状态：高电平，低电平，高阻态。
