Answer on my service request:
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Dear Christian Sielaff,
No, there are no internal "hidden" connectivity options other than listed in Reference Manual.
I can only recommend using RB0 and RB1 lines, if other RB lines are unavailable due to pin multiplexing.
Note - the revision of Reference Manual you are using is not most recent. Please obtain most recent revision form your Freescale FAE.
Thank you for your interest in Freescale Semiconductor products and for the opportunity to serve you.
Best Regards,
Alexander
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Best regrads
Chris