topic Re: S32K can't wake up from VLPS occasionally in S32K

S32K can't wake up from VLPS occasionally

wwww — Sat, 04 Jul 2020 11:25:00 GMT

hi，

i"m using the s32k142 with RUN mode and VLPS mode, through the GPIO interrupt to wake up the chip from VLPS mode, it's working fine in most of times,but there is a slight chance that can't wake up from VLPS mode,only reconnect the power can make chip normal.this situation happened in different boards and can't reproduce.

I would like to know，what situation may cause the MCU can't wake up from VLPS mode? thank you very much.

Re: S32K can't wake up from VLPS occasionally

danielmartynek — Wed, 08 Jul 2020 10:53:54 GMT

Hi,

Please make sure that the interrupts are not masked when the MCU enters VLPS.

You could try using the highest interrupt priority only for the interrupts that are used to wake the MCU up.

BR, Daniel

Re: S32K can't wake up from VLPS occasionally

wwww — Mon, 13 Jul 2020 09:06:11 GMT

hi，

we enabled the PORTB interrupts before enters VLPS, the wake up source was connected with PTB ,the priority was highest.

and , it can wake up normally at the most of times,just 2 or 3 times dead in VLPS.

Re: S32K can't wake up from VLPS occasionally

danielmartynek — Mon, 13 Jul 2020 09:49:37 GMT

Hi,

Could you please make sure that PREDIV_SYS_CLK frequency / BUS_CLK frequency configuration for RUN/VLPR mode is greater than or equal to 2 before executing the transition to VLPS.

Mask Set Errata for Mask 0N33V

https://www.nxp.com/docs/en/errata/S32K142_0N33V.pdf

ERR011063

Thank you,

BR, Daniel

Re: S32K can't wake up from VLPS occasionally

wwww — Tue, 14 Jul 2020 08:49:34 GMT

Hi Daniel,

I checked my clock configuration and maybe it's the reason.

and I was wondering whether there should be some inconsistency about the data in the example. Based on the errata, the dividers in red circles should not be the same but parameters is the same.

thank you !

Re: S32K can't wake up from VLPS occasionally

danielmartynek — Tue, 14 Jul 2020 09:10:09 GMT

Hi,

Yes, based on the RM, SCG_RCCR[DIVBUS] = 0b0001 divides the clock by 2.

Thank you for reporting it.

Regards,

Daniel