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LFCLK question

Dear Nordic guy,I'm developing with nrf51822. I have one question regarding lfclk. I use LFCLK SOURCE RC OSCILATOR of ble_stack_handler_init() at the application side. at this time, I have one question. If 16Mhz main(HF) clock goes to sleep or off from the ble stack due to power saving scenario,Does LFCLK go to sleep or off in according with 16Mhz main(HF) clock? and at this case, How about rtc clock condition? in fact,after I reviewed reference manual clock management part, I have confused.

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