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Question about recovery time from VLPS mode (or stop mode when PLL is stopped) - K and KL parts

Question asked by Mark Butcher on Jul 16, 2014
Latest reply on Jul 21, 2014 by Adrian Cano

Hi All

 

Comparing normal STOP mode and very low power STOP mode it is possible to reduce current consumption by a factor of 10..100.

In normal STOP mode the PLL can however (optionally) continue to run and so there is no recovery time after returning to RUN mode (waiting for the PLL to lock again).

In VLPS mode the PLL is always stopped (the MCG is set back to PEE mode) so the first thing that needs to be done (when not running without PLL) is to reconfigure and wait for it to lock again so that the clock frequencies are correct again.

 

I am wondering about the effect of this when being woked by peripherals - like UART - where the baud rate is not correct during this period. Is the recommendation to avoid using the PLL in such cases or can this procedure be kept short enough that no disruption actually takes place?

 

Regards

 

Mark

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