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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. 

 

Thanks! 

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