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cc2640 ble module clock

Other Parts Discussed in Thread: CC2640

Hi Ti Experts

We have seen 2 clocks are supported which is 48Mhz.One is inbuilt which is for CPU clock and other we have to give external 24 Mhz  crystal to generate 48Mhz which is for RF. We are making a simple BLE Beacon which will transmit data always.Is we have to use 24Mhz external clock.
If yes then what is the purpose of this.