What's up with PE3?

Hello,

I see from Table 23-28 on page 1338 of the TM4C123FE6PM Datasheet that 3 pins (PB0, PB1 & PE3) "...Require an External Pull-up".  I can understand that PB0 and PB1 may be special as they have USB functionality, but what is going on with PE3?  Is the external pull-up required when configured as a GP input?  How about as a GP output (ala open drain)?  I can find no other mention of a specific requirement for this pin in any of the signal tables, etc...

I would appreciate any insight anyone may have to offer.  Thank you!

Regards,

Dave