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TMS320F280049C: IODFTCTRL寄存器功能

Part Number: TMS320F280049C


我配置IODFTCTRL寄存器中的analog loopback功能,并且也是能DFT控制开关,但是收发都没有数据响应,没有形成数据回路这是怎么回事?这个功能是应用在什么情况下?