GPIO retention method

[LSang.11]

Is there a way to prevent the GPIO from changing even if a Self reset is executed?

void SelfReset_Handler(void)

{

  WWDG_SetPrescaler(WWDG_Prescaler_8);

  WWDG_SetWindowValue(80);

  WWDG_Enable(127);

}

Mcu Self Reset -> GPIO High retention

[Uwe Bonnes]

To my knowledge only by external pull resistors. B.t.w, you can force a reset directly, without WWDG

[Ozone]

Exactly.

Upon reset, the default values as specified in the reference manual take effect.

You must work around that with pull-up/pull-down resistors.

Letting the watchdog run out has the advantage of being more compatible/portable accross different platforms.

My company uses XC22xx and some proprietary Fujitsu MCUs in addition to Cortex M and Cortex R.

With large parts of cross-platform software.

[LSang.11]

Thank you for answer.

Is there a way to soft reset other than watchdog?

Without external pull-up resistance

I want to keep the GPIO high even if the MCU performs a soft reset.

Is there any way?