Hi Dave
If that is the case then the processor seems to be very under-utilised. You could look at much cheaper variations for your project.
I have a Coldfire running OS and TCP/IP stack at the following address:
http://212.254.22.36
you can see it via web-cam at http://212.254.22.36:8080
It is running a web server, FTP server, Telnet, SMTP. Such applications represent practically zero load with may be a few short higher speed bursts, but nothing is real impact to such chips. There is also a MC9S12NE64 (a 16 bit freescale processor) doing similar stuff (also visible on the web cam) and contactable at http://212.254.22.36:8081 (User name "anon" password "anon"). Also this chip has no problems with loads experienced in such applications. I also use it for voice over IP where the load is constant and higher (mainly due to SPI interrupts when sending to and receiving from voice codecs) but it still represents only about a constant 15% loading (on the 16 bit chip).
Cheers
Mark
www.mjbc.ch
PS. If you need Ethernet check out also the new M5223X Coldfire chips since they have it onboard. See the following post for details.
http://forums.freescale.com/freescale/board/message?board.id=CFCOMM&message.id=274