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Can KL26Z RTC be operated from internal 32KHz source for 1 second counts?

Question asked by Neil Hancock on Apr 6, 2015
Latest reply on Apr 14, 2015 by Neil Hancock

Hi I have a FRDM-KL26Z that I'm using to prototype a new design using KDS2.0.0

I’m trying to use the RTCx:RTC_LDD & the internal 32KHz clock. In the final design I've got an external 32Khz Osc 10ppm, but for prototyping I'm trying to use the internal 32KHz

In the RTC Properties the “Input Clock frequency” can only be set to 32.768sec – even though the “Clock Path” suggest that it should be able to access the RTC_Counter.

However the RTC_Counter souces seems to be wrong at “0.031Hz” – possibly should be -.”0.031Khz”

On the CPU:MKL26Z128VMC4 component I have the RTC clock input disabled.

System Osc – Enabled – 8Mhz &

ERCLK32K Auto Select – LPO 1KHz

I haven't been able to find any errata associated with a KL26Z

 

Any insights appreciated.

thanks.

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