BF 512 : PLL Programming Sequence

I start working on the BF 512 DSP processor .

Im trying to change the PLL control register (PLL_CTL) value in order set new VCO frequency.

The processor doesn't wake up from idle state .

PLL Programming Sequence :

          cli r2; // disable interrupts
          idle; // wait for Loop_count expired wake up
          sti r2; // enable interrupts

Thank in advance for any suggestions!!

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