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DS90UB947-Q1: GPIO pin setting

Part Number: DS90UB947-Q1

Tool/software:

Hi team,

My customer do not use GPIO pins, but it seems to be Input by default. If they do not set the registers as it is, should the GPIO pins set to H or L? Also, when fixing to L, is it OK to connect directly to GND? 

Regards,

Youhei MIYAOKA