tpu initialization...

I'm having a little problem getting the TPU up and running using the 
data structures defined in mpc555.h.  I'm currently using a Phytec dev 
board w/ mpc555 and Codewarrior IDE.  As I run my program in debug mode 
(step by step), I notice that none of the lines of code that assign 
values to the tpu registers actually change those values (starting at 
0x30400 for tpua).  They all retain their original value of 0xFFFF.  
Ex.
	tpua->TPUMCR.R = 0x6020;
doesn't do anything; the value in this register following execution of 
this line of code is still 0xFFFF.

My program is pretty simple, just programming one of the TPU channels 
for PWM and initializing. Does anyone know why this might be happening?

Thanks,

Chris





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