What does the RCC Option RF Wakeup?

[CBuch.1]

I can not find an Resource that describes the funktion of the RF Wakeup.

Im using an STM32Wb5m, so a dual-core with Application and Network core. In my understanding the "RF Wakeup" is used to wakeup the network core if an signal is coming from the radio - but im not using any Power management options, so the network core should run always and should not need any wakeup.

What am I missing or for what is the "RF Wakeup" clock necessary?

I configure it in my example to use the BLE radio. Without this RCC Config the radio does not work.

    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
 
    
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RFWAKEUP; 
    PeriphClkInitStruct.RFWakeUpClockSelection = RCC_RFWKPCLKSOURCE_LSE;
 
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
        ret = UTILS_ERR;
    }

[Remy ISSALYS · Accepted solution]

Hello,

The "RF Wakeup" clock is necessary because CPU2 always uses power management for radio even if CPU1 doesn't use low power mode.

Best Regards