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CC2420 PLL out of lock

Other Parts Discussed in Thread: CC2420

I've been trying for some time to get my CC2420 to work and the only thing that seems not to be working is the frequency synthesizer. Reading the status byte, I can see the rest is working: the oscillator is turned on and, obviously, the serial communication is ok. 

I tried to follow the datasheet steps and issue the commands shown in Figure 25 (SXOSCON, SRXON, etc) but it doesn't work. Does anyone have any idea where my problem may be?

Thanks