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Kinetis KLx Low Power Modes with External 32kHz Crystal

Question asked by christhomas on Jul 1, 2018
Latest reply on Jul 5, 2018 by Robin_Shen

I am using a KL16 and currently using the 4Mhz Internal Reference Clock. However, in order to reduce current consumption I would like to switch to my 32kHz crystal. 


Since 32 kHz is not fast enough for my calculations and timers, i need to enable the FLL. However, is it possible to use that mode in VLPR mode as again I want to minimise the current consumption as much as possible. Would that work in any of the low power modes or can I only run it in Normal Run Mode. 


In sleep modes (VLLS), is it more efficient to use the 32kHz crystal or the dedicated Low Power timer running off the LPO.