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将芯片没有使用的IO口下拉，是否能降低功耗？
关于未使用引脚的处理，请您参考
2.5 Connection of Unused Pins
https://www.ti.com.cn/cn/lit/ug/slau144j/slau144j.pdf
Px.0 to Px.7 Open Switched to port function, output direction or input with pullup/pulldown enabled
