Anyone knows how to set the core clock at 120MHz with keil on the FRDM-K64F?

Hi

The latest version of the CMSIS startup file for this board contains the confguration for 120 MHz:

We have a new RTX_Blinky for this with MDK 5 Software pack.  I assume you are using Keil MDK 5 ?

I attach the said system file here.

Thanks

Bob Boys

San Jose, California

Thanks, I tried with the blinky example first. now i understand clearly!

I'm having troubles with CLOCK_SETUP 1 and CLOCK_SETUP 3, the application doesn't run

Hi

Looking at the system file I see this:

   3 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode

         Reference clock source for MCG module is an external crystal 8MHz

         Core clock = 120MHz, BusClock = 60MHz

I look at the schematic for this board and do not see an 8 MHz crystal.  25 and 32K only....

Does this need to be added ?  Perhaps to pin 51 XTAL_K64_MAIN ?  I see a R74 too -

Bob

there is a way to configure the 120 MHz in CodeWarrior using the 25MHz crystal, i going to try to configure that on keil with your information, thanks

OK, Finally it's working!!!

You have to replace the file system_MK64F12.c to the newer version and add system_MK64F12.h to the project.

YOU DON'T HAVE TO REPLACE startup_MK64F12.s!!!