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Why does UART not work at Max Clock Configuration

Question asked by Seth Tucker on Mar 21, 2016

I can't get UART to work when I change the clock configuration form the default. This can be recreated by setting up a new project with KSDK 1.3, modifying the UART non blocking example to work in the new project, and the adding


#define CLOCK_SETUP     1u


to the system_MK64F12.h file. If the clocks are left to run at the default speed, UART works perfectly.


I've included my example as an attachment. I am using the FRDM K64F board.

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