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MK60DN512VMD10 MCU question

Question asked by 超 贡 on Jun 21, 2017
Latest reply on Jun 22, 2017 by Kerry Zhou

MCU is MK60DN512VMD10 and I use a example(hello_world) in SDK_2.2_MK60DN512xxx10(download from NXP).

When I  debug it, I found it's MCG->S register is alway 0x10 and the program is run at "while ((MCG->S & (MCG_S_IREFST_MASK | MCG_S_CLKST_MASK)) !=(MCG_S_IREFST(kMCG_FllSrcExternal) | MCG_S_CLKST(kMCG_ClkOutStatExt)))". It means the MCG->S didn't change. I tried both Keil and Kinetis Design Studio 3 IDE, but the question is the same.

My schematic is connect a 50MHz to PTA18(M12). PTA19(M11)、EXTAL32(M6) and XTAL32(M7) is NC。