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

[masahirokiniwa]

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?

Best regards,

M.Kiniwa

[Robin_Shen · Accepted solution]

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.

Best Regards,

Robin

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