I have the same problem. I can't write to registers and yes I observed the same SYS_CLK signal at the exactly same frequency with you. but there was no signal at DATA_CLK. Also SYS_CLK was little bit noisy. I was thinking about the crystal osc. which is feeding TRF IC. Can you tell me how did u set SS* to low. I am using USCI B0 so what I did to set SS* to 0 is
P3OUT &= ~0x01; //Set SS* to LOW.
which clears UCB0STE.
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To read those registers, you should alse be sending read command, am i right? So as far as I can see you communication on SOMI and MOSI pins is successful.. What command do you send to change these registers?