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1. GPIO在复位期间的状态取决于内部的上拉电阻器:
GPIO0-GPIO11 引脚上的上拉电阻器在复位时并不启用。GPIO12-GPIO87 引脚上的上拉电阻器复位时被启用。
https://www.ti.com.cn/cn/lit/ds/zhcs889q/zhcs889q.pdf P22
2. 具体是哪个管脚,最好是有波形看一下。
3. 最好还是有波形来看一下。