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CC2540 External LF Clock

Other Parts Discussed in Thread: CC2540

Hi, I want to use an external 32.786KHz oscillator in place of a crystal for the secondary oscillator on the CC2540.  It is not clear from the data sheet which pin should be used to inject this clock - Pin 32 or Pin 33?  Also, can this accept a logic level clock signal or should I reduce its amplitude?

Do I need to set any of the oscillator registers differently if using such an external clock?