S32K344'sPadkeeping

luyq · ‎10-12-2021

Hello!

I saw the padkeeping function in the chip manual. The original text says, "Pad keeping allows you to return to I/O Run mode configuration settings after using I/O during Standby mode. It eliminates I/O
reconfiguration in Run mode."
I have two questions here: 1. How to change the state of IO in StandBy mode? 2. After exiting StandBy mode, is the chip equivalent to resetting?

Looking forward to your reply!

danielmartynek · ‎10-13-2021

Hello @luyq,

When pad keeping is enabled, it can ensure that the pin can retain its states from wakeup until user unlock it (during standby, wakeup - reset)

The wakeup is always through a reset and if the pad keeping is disabled, the pins will be placed to thier default states after reset by default. Which means that for the time between the wakeup and the port re-initialization, the pins are uncontrollable.

Regards,

Daniel

View solution in original post

danielmartynek · ‎10-13-2021

Hello @luyq,

When pad keeping is enabled, it can ensure that the pin can retain its states from wakeup until user unlock it (during standby, wakeup - reset)

The wakeup is always through a reset and if the pad keeping is disabled, the pins will be placed to thier default states after reset by default. Which means that for the time between the wakeup and the port re-initialization, the pins are uncontrollable.

Regards,

Daniel

luyq · ‎10-13-2021

Hello，

Thank you for your answer, I would like to ask if the IO output state can be changed after the chip enters the StandBy mode？

danielmartynek · ‎10-13-2021

Please refer to the RM.

danielmartynek_0-1634134056210.png

BR, Daniel