Ya seems that would apply, thanks for the find, didn't come up on my searches. Will watch to see if there's confirmation.
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I can't find a document to describe the unused I/O interface, since they are standard communication interface, normally,
- Input, need a pull-up resistance to VIO.
- Output, can be floating.
- I/O , we can configure them after chip reset .
if there have questions , please correct me, thanks.