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具体要看什么管脚，如果是有内部上下拉电阻的管脚，复位状态下是低电平。请看TRM的描述。
The PUPD_SEL settings are not active until the device is out of reset. During reset, all of the CP[n] pins are pulled down. If the application requires a pull-up during reset, an external pullup should be used. www.ti.com/.../spruh79c.pdf
