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LAUNCHXL-CC2650: how to configure the clock source of clock module

Part Number: LAUNCHXL-CC2650
Other Parts Discussed in Thread: CC2650, SYSBIOS

Ti engineer,

Because I need to accurately record the time stamp in the program, I am now learning the clock source of CC2650.

Through studying the datasheet and TRM, I understand that there are two external clock sources XOSC_HF and XOSC_LF and two internal clock sources RCOSC_HF and RCOSC_L.

Through studying TI-RTOS kernel user guide, I understand that there are four clock modules Clock, timer, seconds and timestamp.

I plan to use clock to record timestamps, but I don't know which clock source enables the clock module. I observed that there is such a paragraph in the datasheet:

does it mean that the clock source of the clock module can be configured as XOSC_HF or RCOSC_HF? Because I understand that the stability and accuracy of the crystal oscillator are higher than that of the RC oscillator, I hope that the clock source of the clock module can be configured as XOSC_HF. How should I implement this in TI-RTOS?

Looking forward to reply, thank you.