How to see the 32kHz oscillator crystal start-up time (tstart)?

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How to see the 32kHz oscillator crystal start-up time (tstart)?

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masahirokiniwa
Contributor IV

Hi,

I see the Table 22 in Kinetis K27 data sheet.

It was written typ. 1000ms, but I couldn't find its starting point.

When is the starting point? After then POR/Reset or other timming?

Could you tell me its starting point?

pastedImage_1.png

Best regards,

M.Kiniwa

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi Masahiro,

You can find below information at RTC_CR[OSCE].

After setting this bit, wait the oscillator startup time before enabling the time counter to allow the 32.768 kHz clock time to stabilize.

RTC_CR[OSCE].jpg

Best Regards,

Robin

 

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Robin_Shen
NXP TechSupport
NXP TechSupport

Hi Masahiro,

You can find below information at RTC_CR[OSCE].

After setting this bit, wait the oscillator startup time before enabling the time counter to allow the 32.768 kHz clock time to stabilize.

RTC_CR[OSCE].jpg

Best Regards,

Robin

 

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

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