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Should I enable pull-up of GPIO to detect a floating USB ID-Pin?

Question asked by Kai Liu on Aug 22, 2013
Latest reply on Aug 29, 2013 by Kai Liu

I am designing H/W F/W for USB OTG on KL25Z. Now I know in OTG design, the ID-pin should be floating as device (type B), and ground for host (type A). KLQRUG.pdf

 

However, I am not sure the result of reading digital input on specific floating GPIO, high, low or uncertain state?

 

Should I enable pull-up of GPIO (PE/PS in PORTx_PCRn)?

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