I am working with your FRDM K64F in bare metal. I read Chapter 25 (MCG) of the reference manual and I have managed to rise the clock frequency to 24 MHz using the FLL module by setting DMX32 bit in MCG_C4 register right after a system reset. However, when trying to rise the clock frequency by changing DRST_DRS bits in MCG_C4 register to any other value different to 00, the program crashes. How can I achieve 96 MHz clock frequency shown in the table below? I am currently working within FEI mode, which is the default mode after a system reset.
Thank you in advance