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RTOS/LAUNCHXL-F28069M: Question on timer period

Part Number: LAUNCHXL-F28069M

Tool/software: TI-RTOS

I imported a TI-RTOS code project from CCSv6 with RTOS v6.46 to CCSv8 with RTOS v6.53, which worked well in the previous environment. I configured a 2ms timer that is used for ADC SOC triggering source. I set the timer period by entering 2000 us in the timer instance configuration window. After running for a while, I halted it and opened the RTOS Analyzer->Execution graph, the ADCINT interval was 2ms correctly; however, in the new environment, the same 2ms timer shows 160 us, the value was two times of system clock frequency 80 MHz. If I changed the system clock frequency to 40 MHz, the timer interval became 80 us. It does not make sense to me at all. The project settings and execution graph screenshots are provided in the attachment. Please advise.

Thanks!

Question on timer interval in CCS v8 with TI-RTOS v6.53.docx