I am trying to setup K66 to run with 180 MHz core clock. My question is: can I do it without external oscillator on EXTAL0, XTAL0 pins. I have external oscillator(32768Hz) on EXTAL32, XTAL32 pins. In reference manual I found that this kind of speed (180 MHz) can be achieved only with PLL. The problem is that transition to PEE or PBE mode is only possible from FBE mode? And OSCCLK clock (whcih can be only generated by external oscillator) is required in FBE mode ?