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Clock configuration in system_mk20D7.c file in keil

blessed over 3 years ago

I am working on a teensy 3.2 board that uses mk20d7256vlh7 kinetis k20 microcontroller.
Now when i add this device in keil and set my run time environment the default file added by keil is system_mk20d7.c file
This file contains a default clock of 20M and i verified this by running a PIT timer that core clock is set at 20M
But there is no register configuration for different clock configurations in systemInit function in this file which is present is in system_mk20d5.c file.which i checked in example projects
What should i do to set configuration for my clock at my desired frequency.?