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K20 Internal Clock FLL doesn't work

Question asked by Mark Kalior on Sep 14, 2015
Latest reply on Sep 16, 2015 by jeremyzhou

Based on the K20P121100SF2V2RM.pdf and Processor Expert, I can select the internal 32.768Khz clock and still use FLL. 

MCG mode = FEI

SIM_SOPT2 = PLLFLLSEL(0)

SIM_SOPT1 = OSC32KSEL(2)

MCG_C1 = 0x07

MCG_C2 = 0

MCG_C4 = 0xE0

OSR_CR = 0

MCG_C7 = 1

MCG_C5 = 0

MCG_C6 = 0

MCG_S & 0x10 (IREFST) is 0, should go to 1, but doesn't.   and CLKST is 3

 

What am I doing wrong?

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