That link doesn't work any more. Neither using NXP's search. Neither does using Google. Navigating to the current (modified for Phone use) MCF51JM page and looking through the Software list finds it.
The software is now apparently called:
Using the CAU and mmCAU in ColdFire+<sup>®</sup><sup>®</sup>, ColdFire+ and Kinetis<sup>&#...
https://www.nxp.com/webapp/Download?colCode=AN4307SW&Parent_nodeId=1201542323437713916659&Parent_pag...
After demanding personal details and filling in a form about "Export Control", nothing... The "Download" page doesn't do anything. There's an "Export Control FAQ link that doesn't do anything either.
Pasting the above link into a browser the SECOND time worked though.
(Edit) And the User Guide is:
http://cache.freescale.com/files/32bit/doc/user_guide/CAUAPIUG.pdf
Tom