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CCS/CC2640: ti rtios CPUdelay()

Part Number: CC2640

Tool/software: Code Composer Studio

HI,

I want to know how long  CPUdelay(uint32_t ui32Count) cost? It said ui32Count is The loop takes 3 cycles/loop.Such as my clock is 24M,

#define SET_CCFG_MODE_CONF_XOSC_FREQ                    0x3        // HF source is a 24 MHz xtal (default)

 does one cycles is 1/24 000 000?  that meas CPUdelay(8000000) cost 1 second? but I test in my board , it doesn't look like this.

Thanks for your help.