nRF52833, about GPIO default states in System Off mode

[natahan]

Hi There,

Are the GPIO levels high impedance when the system is in off mode? Can you give information about their status? For example, one pin of the device is configured as pull-down. If the system is put into System Off mode from deep sleep modes, will the configured pin go into high impedance state? or will there be a change in the set pin configuration?

Thanks.

[Vidar Berg]

Hello,

GPIO configurations made by the application are preserved when you enter System OFF mode, so if you want all pins to be in high impedance, you must ensure the pins you have used are configured back to their reset state before going to sleep.

For example, one pin of the device is configured as pull-down. If the system is put into System Off mode from deep sleep modes, will the configured pin go into high impedance state?

Then the pull-down will remain enabled.

Best regards,

Vidar

  

[natahan]

Thank you for the answer.

Are the states kept as they were configured before a reset command (by pin or soft reset) during system reset or should we expect GPIOs to be in high impedance mode during reset? Will they be in the correct state after reset, or will they default to something default?

[Vidar Berg]

The pin state is only guaranteed to be high impedance after a system reset. The state during the reset is not defined, it may be the same as it was prior to the reset, or it may have the default high impedance state.

Pin configuration when coming out of a reset: