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CCS/TM4C123GH6PM: How to measure number clocks using debugger?

Part Number: TM4C123GH6PM


Tool/software: Code Composer Studio

 I want to measure the number of clocks(or execution time) for certain function ?

 I am using TM4C123GH6PM with CCS v6, and i opened Debug session, when trying to enable clock form (run->clock) as said here http://processors.wiki.ti.com/index.php/Profile_clock_in_CCS

, i could not as all the list are disabled and i can not choose any of them,