https://community.nxp.com/t5/Kinetis-Microcontrollers/MK10DN512xxx-Slow-Start/m-p/1257197#M60089 <P>Hi Simon,</P> <P>Can you give more detail about the problem, like the clock configuration, hardware and what the problem looks like?</P> <P>&nbsp;</P> <P>Regards,</P> <P>Jing</P> Tue, 06 Apr 2021 09:20:40 GMT jingpan 2021-04-06T09:20:40Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK10DN512xxx-Slow-Start/m-p/1256345#M60070 I have PCB with this part I designed in 2012 using CW for MCU V11 and Processor Expert. The external Xtal is 6.144MHz and the PLL boosts to 98.304MHz. The original code had a for() loop timer that was needed before calling MCU_Init() and any other code. If not the CPU did not always start properly (except it always ran fine with JTAG J-Link and IDE). The last time we built the boards was 2013. Now 8 years later we just built some more. Now I find that I need to double the for() loop timer to get the CPU to start reliably. Anyone else seen this issue? Fri, 02 Apr 2021 15:21:16 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK10DN512xxx-Slow-Start/m-p/1256345#M60070 simonmachell 2021-04-02T15:21:16Z https://community.nxp.com/t5/Kinetis-Microcontrollers/MK10DN512xxx-Slow-Start/m-p/1257197#M60089 <P>Hi Simon,</P> <P>Can you give more detail about the problem, like the clock configuration, hardware and what the problem looks like?</P> <P>&nbsp;</P> <P>Regards,</P> <P>Jing</P> Tue, 06 Apr 2021 09:20:40 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/MK10DN512xxx-Slow-Start/m-p/1257197#M60089 jingpan 2021-04-06T09:20:40Z