Lpc2000

Hi, 
Can someone point me to the register definitions for the LPC2148?  I
am having UART troubles at full speed, although single stepping works.
I cannot find where the bit definitions are for all of the registers
that are shown in the IAR environment for example. The datasheet I
have Rev1 Sept7 2005, and the online Keil book don't seem to have all
of that either.  I can see the header file definitions, but without
comments.
Thanks,
Steve