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TMS320C6418的GPIO配置问题

Other Parts Discussed in Thread: TMS320C6418
TI工程师您好!
关于TMS320C6418问题:6418的普通GPIO是可以通过设置寄存器使其处于高阻态的,但是对于属于McASP的HD21管脚在当作GPIO使用时可不可以通过配置寄存器设置其为高阻态?  求指导,谢谢!