ARM, RISC-V контроллеры

int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    Inputs_Init();

    PVD_Init(PWR_PVDLevel_MODE7);   //Instead supervisor
    if(PWR_GetFlagStatus(PWR_FLAG_PVDO) == SET)  software_reset();  // If low power supply
    .......
}

Ранее определил функции:

volatile uint8_t Voltage_ThresFlag=0;
// Function to perform a software reset for RISC-V CH32
void software_reset(void) {
    // Clear all reset status flags (RMVF = 1) - optional but good practice
    // This register might vary by model, check the datasheet/reference manual
    RCC->RSTSCKR |= (1 << 24);

    // Perform software reset by writing specific keys to PFIC->CFGR
    // KEYCODE = 0xBEEF, RESETSYS = 1 (bit 7)
    PFIC->CFGR = 0xBEEF0080;
}

void PVD_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void PVD_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line16) != RESET) //Откуда пришло прерывание
    {
        Voltage_ThresFlag = !PWR_GetFlagStatus(PWR_FLAG_PVDO);
        if (Voltage_ThresFlag == RESET) software_reset();
        //printf("Run at EXTI\r\n");
        EXTI_ClearITPendingBit(EXTI_Line16);
    }
}
/*********************************************************************/

void PVD_Init(uint32_t Level_Mode)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    EXTI_InitTypeDef EXIT_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    EXIT_InitStructure.EXTI_Line = EXTI_Line16;
    EXIT_InitStructure.EXTI_LineCmd = ENABLE;
    EXIT_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXIT_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
    EXTI_Init(&EXIT_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = PVD_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    PWR_PVDLevelConfig(Level_Mode);

    PWR_PVDCmd(ENABLE);
}