where is a start timing at "180ms" of AUTO_RESTART bit?

[t-iishii]

Hi community,

I have one question about AUTO_RESTART bit of HW_RTC_PERSISTENT0 register on i.MX28.

In Reference Manual of i.MX28, Description of AUTO_RESTART bit is following.

17 AUTO_RESTART "Set to one to enable the chip to automatically power up approximately 180 ms after powering down."

In this comment, where is a start timing at "180ms"?

Best regards,

Ishii.

[igorpadykov]

Hi Ishii

start will be from moment when power supplies become turned off.

Best regards
igor
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[t-iishii]

Hello igor,

Thank you for your quick response.

You say that if Power source is only DCDC_BAT,

"turned off" timing is that system detect DCDC_BAT low level and start brownout sequence.

Is it correct?

If so, does it have some method to detect start timing by software or external signal?

Best regards,

Ishii.

[igorpadykov]

Hi Ishii

I said : "start will be from moment when power supplies become turned off."

I am afraid there is no way detect start timing by software or external signal.

Best regards
igor