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TMS320F28335: SCI BOOTLOADER的问题

Part Number: TMS320F28335

请问高手,SCIAbootloader应该如何配置管脚。

我把GPIO87,86,85,84分别设为0,1,1,0

GPIO34,37都设为低电平。

可是C2Prog提示:

 

image.png

请问高手,哪里错了?谢谢!