Finally I archieved to configure SPI registers.
It was neccesary to 'power up' SPI module with this sequence:
1.- Wait until PTSTAT is 0
2.- Set enable state in MDCTL22 (SPI)
3.- Set 'GO' bit in PTCMD
4.- Wait until PTSTAT is 0

Now I think my registers are properly configured, but I still can't
see SPI CLK in DC3 pin 5. All I should do for SPI to transmit is to
write to SPIDAT1... right?

Thanks,
Carlos
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