Why pinrst is configured after sftrst

[ckim.2390]

If you run it with the reset pin, you can use the "__HAL_RCC_GET_FLAG()" function

You can see that "RCC_FLAG_PINRST" is set.

However, when executed with "HAL_NVIC_SystemReset()", "RCC_FLAG_SFTRST" and "RCC_FLAG_PINRST" are set.

My expectation is that only "RCC_FLAG_SFTRST" should be set.

what is the reason?

And "__HAL_RCC_GET_FLAG(RCC_FLAG_LPWRRST)" doesn't work at all.

//my code

void main()

{

 if(true == __HAL_PWR_GET_FLAG(PWR_FLAG_WUF2))

 {

   __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);

   debug("wakeup pin 2\r\n");

 }

 if(true == __HAL_PWR_GET_FLAG(PWR_FLAG_SB))

 {

   __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);

   debug("Standby\r\n");

 }

 if(true == __HAL_PWR_GET_FLAG(PWR_FLAG_WUF))

 {

   __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF);

   debug("all wakeup pin\r\n");

 }

 if(true == __HAL_RCC_GET_FLAG(RCC_FLAG_PWRRST))

   debug("POWER ON RESET\r\n");

 if(true == __HAL_RCC_GET_FLAG(RCC_FLAG_PINRST))

   debug("PIN RESET\r\n");

 if(true == __HAL_RCC_GET_FLAG(RCC_FLAG_SFTRST))

   debug("SOFTWARE RESET\r\n");

 if(true == __HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST))

   debug("WATCHDOG RESET\r\n");

 if(true == __HAL_RCC_GET_FLAG(RCC_FLAG_LPWRRST))

   debug("LOWPOWER RESET\r\n");

 __HAL_RCC_CLEAR_RESET_FLAGS();

while(1)

{

  if(GPIO_PIN_RESET == HAL_GPIO_ReadPin(BTN1_GPIO_Port,BTN1_Pin))

  {

   HAL_NVIC_SystemReset();

  }

  if(GPIO_PIN_RESET == HAL_GPIO_ReadPin(BTN2_GPIO_Port,BTN2_Pin))

  {

   HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH);

   HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 9, RTC_WAKEUPCLOCK_CK_SPRE_16BITS);

   __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2|PWR_FLAG_SB);

   HAL_PWR_EnterSTANDBYMode();

  }

}

}

[TDK · Accepted solution]

That's just how it works. PINRSTF is set on most types of reset. Examine all flags and match up to the expected pattern for the given reset type.

[ckim.2390]

thank you. Resolved.

What kind of document is the screenshot?

[TDK]

That’s in the stm32h7 reference manual.