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标题: M480芯片GPIO上下拉问题 [打印本页]

作者: capvor 时间: 2020-2-27 22:21
标题: M480芯片GPIO上下拉问题
在M480系列芯片手册中GPIO PxPUSEL 的描述如下：
Note 1: Basically, the pull-up control and pull-down control has following behavior
limitation
The independent pull-up control register only valid when MODEn set as tri-state and
open-drain mode
The independent pull-down control register only valid when MODEn set as tri-state mode
When both pull-up pull-down is set as 1 at “tri-state” mode, keep I/O in tri-state mode

1，请问 tri-state 在 MODE 描述中没有，请问 tri-state 指的是什么模式？？
2，请问这里说上拉控制只在 tri-state and open-drain mode 有效，下拉控制只在 tri-state mode 有效；那么 Input mode ，不能上下拉吗？？

作者: 匿名 时间: 2020-2-28 17:14
tri-state就是三态及高阻输入态，tri-state 就是Input mode

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