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Hercules MCU 使用CAN3 TX RX 管脚复用GIO,初始值不能设置问题

使用芯片为lx1225,由于芯片原有GIO管脚不够,所以使用CAN3 TX RX管脚作为GIO输入使用,但是这样配置完成后,CAN3TX管脚初始电平为3V左右,请问有办法使TX管脚的初始电平为0吗?