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TM4C123G USB接口问题



TM4C123G,仿真接口用的Micro  USB
USB 的1管脚对应5V,查看GPIO模块
 PB1配置成输入时最大接受电压为3.6V。
这是什么原因呢?
是不是PB1配置成USB0VBUS时,就正好对应USB,1管脚的5V电压?

2.GPIO每个管脚最大接受5V电压。如果PB1配置成USB0VBUS时,就正好对应USB,1管脚的5V电压。

USB1脚电压有浮动可能最大到5.25这样会不会击穿管脚