That was reported in 2009. It looks like a cut-and-paste error from the MCF52251 Reference Manual where it is a Dual Function Register. You get that a lot in these manuals.
PUCPAR has to be quad-function as "Table 2-1. Pin Functions by Primary and Alternate Purpose (continued)" lists three functions for two of the PUC port pins.
The Reference Manual Revisions 3 and 4 are both wrong. The 2011 Reference Manual Errata doesn't fix it.
Searching this forum for "PUCPAR" finds:
https://community.nxp.com/message/50941 "MCF52211 PUCPAR quad or dual function?"
https://community.nxp.com/message/50914?commentID=50914#comment-50914 "M5225x - PUCPAR Manual Error (2009)"
https://community.nxp.com/message/51924
One of the above notes a Service Request against this was sent in 2009. Two manual revisions came out after that Service Request AND the Errata, with the same bug still present.
Watch out for PTD. It may not apply to your chip, but it might.
https://community.nxp.com/message/69254
Watch out for the two "Bear PITs". I may be the only person on the planet who has managed to get the PIT programmed properly. Enjoy the "redaction doesn't seems to implies" [sic] response from Freescale.
https://community.nxp.com/message/71442?commentID=71442#comment-71442
The Coldfire manuals are pretty good when compared to some others.
https://community.nxp.com/message/425415
Tom
