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STM32 c8t6按键

于 2023-04-21 发布 文件大小:6.20 MB
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首先,上拉电阻是为了保证在没有信号输入的时候,IO口保持高电平,若按键为低电平有效,则没有信号的时候,IO应呈现高电平,所以,此处应设置为上拉输入。 同理,下拉电阻是为了保证在没有信号输入的时候,IO口保持低电平,若按键为高电平有效,则没有信号的时候,IO应呈现低电平

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