Hi, please, I don't understand: How to using the external 32.768Khz crystal in the MKL26Z chip to get counter precision in date and time with the low power mode (LLS). I don't intend uses the internal LPO1khz. Thanks.
Please install MCUXpresso Config Tool and set clock tree like the picture below:
My conclusions for my application is:>LPO with LPTMR is not good, why the interrupt is 1,0007 seconds.>with external crystal 32.768khz, the core and bus clock is to low.So, I will test the external RTC input clock with internal 4Mhz clock to core and 2Mhz to bus.
At the moment, I found another alternative, as soon as possible I will try to employ an crystal of the ABRACON - ASDK series.
There is some more general info here that may help: http://www.utasker.com/kinetis/KL_RTC.html
Generally one uses an external low power oscillator.
Kinetis: http://www.utasker.com/kinetis.htmlKinetis KL25, KL26, KL27, KL28:- http://http://www.utasker.com/kinetis/FRDM-KL25Z.html- http://www.utasker.com/kinetis/TWR-KL25Z48M.html- http://www.utasker.com/kinetis/FRDM-KL26Z.html- http://www.utasker.com/kinetis/TEENSY_LC.html- http://www.utasker.com/kinetis/FRDM-KL27Z.html- http://www.utasker.com/kinetis/Capuccino-KL27.html- http://www.utasker.com/kinetis/FRDM-KL28Z.htmlRTC and time keeping: http://www.utasker.com/docs/uTasker/uTasker_Time.pdf
Free Open Source solution: https://github.com/uTasker/uTasker-KinetisWorking project in 15 minutes video: https://youtu.be/K8ScSgpgQ6M
Professional Kinetis support, one-on-one training and complete fast-track project solutions: http://www.utasker.com/support.html
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