path: root/docs/source/libmaple/api/rcc-reg-bits.txt

STM32F1 Targets
~~~~~~~~~~~~~~~

Clock control register
++++++++++++++++++++++

::

    #define RCC_CR_PLLRDY_BIT               25
    #define RCC_CR_PLLON_BIT                24
    #define RCC_CR_CSSON_BIT                19
    #define RCC_CR_HSEBYP_BIT               18
    #define RCC_CR_HSERDY_BIT               17
    #define RCC_CR_HSEON_BIT                16
    #define RCC_CR_HSIRDY_BIT               1
    #define RCC_CR_HSION_BIT                0

    #define RCC_CR_PLLRDY                   (1U << RCC_CR_PLLRDY_BIT)
    #define RCC_CR_PLLON                    (1U << RCC_CR_PLLON_BIT)
    #define RCC_CR_CSSON                    (1U << RCC_CR_CSSON_BIT)
    #define RCC_CR_HSEBYP                   (1U << RCC_CR_HSEBYP_BIT)
    #define RCC_CR_HSERDY                   (1U << RCC_CR_HSERDY_BIT)
    #define RCC_CR_HSEON                    (1U << RCC_CR_HSEON_BIT)
    #define RCC_CR_HSICAL                   (0xFF << 8)
    #define RCC_CR_HSITRIM                  (0x1F << 3)
    #define RCC_CR_HSIRDY                   (1U << RCC_CR_HSIRDY_BIT)
    #define RCC_CR_HSION                    (1U << RCC_CR_HSION_BIT)

Clock configuration register
++++++++++++++++++++++++++++

::

    #define RCC_CFGR_USBPRE_BIT             22
    #define RCC_CFGR_PLLXTPRE_BIT           17
    #define RCC_CFGR_PLLSRC_BIT             16

    #define RCC_CFGR_MCO                    (0x3 << 24)
    #define RCC_CFGR_USBPRE                 (1U << RCC_CFGR_USBPRE_BIT)
    #define RCC_CFGR_PLLMUL                 (0xF << 18)
    #define RCC_CFGR_PLLXTPRE               (1U << RCC_CFGR_PLLXTPRE_BIT)
    #define RCC_CFGR_PLLSRC                 (1U << RCC_CFGR_PLLSRC_BIT)
    #define RCC_CFGR_ADCPRE                 (0x3 << 14)
    #define RCC_CFGR_PPRE2                  (0x7 << 11)
    #define RCC_CFGR_PPRE1                  (0x7 << 8)
    #define RCC_CFGR_HPRE                   (0xF << 4)
    #define RCC_CFGR_SWS                    (0x3 << 2)
    #define RCC_CFGR_SWS_PLL                (0x2 << 2)
    #define RCC_CFGR_SWS_HSE                (0x1 << 2)
    #define RCC_CFGR_SW                     0x3
    #define RCC_CFGR_SW_PLL                 0x2
    #define RCC_CFGR_SW_HSE                 0x1

Clock interrupt register
++++++++++++++++++++++++

::

    #define RCC_CIR_CSSC_BIT                23
    #define RCC_CIR_PLLRDYC_BIT             20
    #define RCC_CIR_HSERDYC_BIT             19
    #define RCC_CIR_HSIRDYC_BIT             18
    #define RCC_CIR_LSERDYC_BIT             17
    #define RCC_CIR_LSIRDYC_BIT             16
    #define RCC_CIR_PLLRDYIE_BIT            12
    #define RCC_CIR_HSERDYIE_BIT            11
    #define RCC_CIR_HSIRDYIE_BIT            10
    #define RCC_CIR_LSERDYIE_BIT            9
    #define RCC_CIR_LSIRDYIE_BIT            8
    #define RCC_CIR_CSSF_BIT                7
    #define RCC_CIR_PLLRDYF_BIT             4
    #define RCC_CIR_HSERDYF_BIT             3
    #define RCC_CIR_HSIRDYF_BIT             2
    #define RCC_CIR_LSERDYF_BIT             1
    #define RCC_CIR_LSIRDYF_BIT             0

    #define RCC_CIR_CSSC                    (1U << RCC_CIR_CSSC_BIT)
    #define RCC_CIR_PLLRDYC                 (1U << RCC_CIR_PLLRDYC_BIT)
    #define RCC_CIR_HSERDYC                 (1U << RCC_CIR_HSERDYC_BIT)
    #define RCC_CIR_HSIRDYC                 (1U << RCC_CIR_HSIRDYC_BIT)
    #define RCC_CIR_LSERDYC                 (1U << RCC_CIR_LSERDYC_BIT)
    #define RCC_CIR_LSIRDYC                 (1U << RCC_CIR_LSIRDYC_BIT)
    #define RCC_CIR_PLLRDYIE                (1U << RCC_CIR_PLLRDYIE_BIT)
    #define RCC_CIR_HSERDYIE                (1U << RCC_CIR_HSERDYIE_BIT)
    #define RCC_CIR_HSIRDYIE                (1U << RCC_CIR_HSIRDYIE_BIT)
    #define RCC_CIR_LSERDYIE                (1U << RCC_CIR_LSERDYIE_BIT)
    #define RCC_CIR_LSIRDYIE                (1U << RCC_CIR_LSIRDYIE_BIT)
    #define RCC_CIR_CSSF                    (1U << RCC_CIR_CSSF_BIT)
    #define RCC_CIR_PLLRDYF                 (1U << RCC_CIR_PLLRDYF_BIT)
    #define RCC_CIR_HSERDYF                 (1U << RCC_CIR_HSERDYF_BIT)
    #define RCC_CIR_HSIRDYF                 (1U << RCC_CIR_HSIRDYF_BIT)
    #define RCC_CIR_LSERDYF                 (1U << RCC_CIR_LSERDYF_BIT)
    #define RCC_CIR_LSIRDYF                 (1U << RCC_CIR_LSIRDYF_BIT)

Peripheral reset registers
++++++++++++++++++++++++++

::

    #define RCC_APB2RSTR_TIM11RST_BIT       21
    #define RCC_APB2RSTR_TIM10RST_BIT       20
    #define RCC_APB2RSTR_TIM9RST_BIT        19
    #define RCC_APB2RSTR_ADC3RST_BIT        15
    #define RCC_APB2RSTR_USART1RST_BIT      14
    #define RCC_APB2RSTR_TIM8RST_BIT        13
    #define RCC_APB2RSTR_SPI1RST_BIT        12
    #define RCC_APB2RSTR_TIM1RST_BIT        11
    #define RCC_APB2RSTR_ADC2RST_BIT        10
    #define RCC_APB2RSTR_ADC1RST_BIT        9
    #define RCC_APB2RSTR_IOPGRST_BIT        8
    #define RCC_APB2RSTR_IOPFRST_BIT        7
    #define RCC_APB2RSTR_IOPERST_BIT        6
    #define RCC_APB2RSTR_IOPDRST_BIT        5
    #define RCC_APB2RSTR_IOPCRST_BIT        4
    #define RCC_APB2RSTR_IOPBRST_BIT        3
    #define RCC_APB2RSTR_IOPARST_BIT        2
    #define RCC_APB2RSTR_AFIORST_BIT        0

    #define RCC_APB2RSTR_TIM11RST           (1U << RCC_APB2RSTR_TIM11RST_BIT)
    #define RCC_APB2RSTR_TIM10RST           (1U << RCC_APB2RSTR_TIM10RST_BIT)
    #define RCC_APB2RSTR_TIM9RST            (1U << RCC_APB2RSTR_TIM9RST_BIT)
    #define RCC_APB2RSTR_ADC3RST            (1U << RCC_APB2RSTR_ADC3RST_BIT)
    #define RCC_APB2RSTR_USART1RST          (1U << RCC_APB2RSTR_USART1RST_BIT)
    #define RCC_APB2RSTR_TIM8RST            (1U << RCC_APB2RSTR_TIM8RST_BIT)
    #define RCC_APB2RSTR_SPI1RST            (1U << RCC_APB2RSTR_SPI1RST_BIT)
    #define RCC_APB2RSTR_TIM1RST            (1U << RCC_APB2RSTR_TIM1RST_BIT)
    #define RCC_APB2RSTR_ADC2RST            (1U << RCC_APB2RSTR_ADC2RST_BIT)
    #define RCC_APB2RSTR_ADC1RST            (1U << RCC_APB2RSTR_ADC1RST_BIT)
    #define RCC_APB2RSTR_IOPGRST            (1U << RCC_APB2RSTR_IOPGRST_BIT)
    #define RCC_APB2RSTR_IOPFRST            (1U << RCC_APB2RSTR_IOPFRST_BIT)
    #define RCC_APB2RSTR_IOPERST            (1U << RCC_APB2RSTR_IOPERST_BIT)
    #define RCC_APB2RSTR_IOPDRST            (1U << RCC_APB2RSTR_IOPDRST_BIT)
    #define RCC_APB2RSTR_IOPCRST            (1U << RCC_APB2RSTR_IOPCRST_BIT)
    #define RCC_APB2RSTR_IOPBRST            (1U << RCC_APB2RSTR_IOPBRST_BIT)
    #define RCC_APB2RSTR_IOPARST            (1U << RCC_APB2RSTR_IOPARST_BIT)
    #define RCC_APB2RSTR_AFIORST            (1U << RCC_APB2RSTR_AFIORST_BIT)

    #define RCC_APB1RSTR_DACRST_BIT         29
    #define RCC_APB1RSTR_PWRRST_BIT         28
    #define RCC_APB1RSTR_BKPRST_BIT         27
    #define RCC_APB1RSTR_CANRST_BIT         25
    #define RCC_APB1RSTR_USBRST_BIT         23
    #define RCC_APB1RSTR_I2C2RST_BIT        22
    #define RCC_APB1RSTR_I2C1RST_BIT        21
    #define RCC_APB1RSTR_UART5RST_BIT       20
    #define RCC_APB1RSTR_UART4RST_BIT       19
    #define RCC_APB1RSTR_USART3RST_BIT      18
    #define RCC_APB1RSTR_USART2RST_BIT      17
    #define RCC_APB1RSTR_SPI3RST_BIT        15
    #define RCC_APB1RSTR_SPI2RST_BIT        14
    #define RCC_APB1RSTR_WWDRST_BIT         11
    #define RCC_APB1RSTR_TIM14RST_BIT       8
    #define RCC_APB1RSTR_TIM13RST_BIT       7
    #define RCC_APB1RSTR_TIM12RST_BIT       6
    #define RCC_APB1RSTR_TIM7RST_BIT        5
    #define RCC_APB1RSTR_TIM6RST_BIT        4
    #define RCC_APB1RSTR_TIM5RST_BIT        3
    #define RCC_APB1RSTR_TIM4RST_BIT        2
    #define RCC_APB1RSTR_TIM3RST_BIT        1
    #define RCC_APB1RSTR_TIM2RST_BIT        0

    #define RCC_APB1RSTR_DACRST             (1U << RCC_APB1RSTR_DACRST_BIT)
    #define RCC_APB1RSTR_PWRRST             (1U << RCC_APB1RSTR_PWRRST_BIT)
    #define RCC_APB1RSTR_BKPRST             (1U << RCC_APB1RSTR_BKPRST_BIT)
    #define RCC_APB1RSTR_CANRST             (1U << RCC_APB1RSTR_CANRST_BIT)
    #define RCC_APB1RSTR_USBRST             (1U << RCC_APB1RSTR_USBRST_BIT)
    #define RCC_APB1RSTR_I2C2RST            (1U << RCC_APB1RSTR_I2C2RST_BIT)
    #define RCC_APB1RSTR_I2C1RST            (1U << RCC_APB1RSTR_I2C1RST_BIT)
    #define RCC_APB1RSTR_UART5RST           (1U << RCC_APB1RSTR_UART5RST_BIT)
    #define RCC_APB1RSTR_UART4RST           (1U << RCC_APB1RSTR_UART4RST_BIT)
    #define RCC_APB1RSTR_USART3RST          (1U << RCC_APB1RSTR_USART3RST_BIT)
    #define RCC_APB1RSTR_USART2RST          (1U << RCC_APB1RSTR_USART2RST_BIT)
    #define RCC_APB1RSTR_SPI3RST            (1U << RCC_APB1RSTR_SPI3RST_BIT)
    #define RCC_APB1RSTR_SPI2RST            (1U << RCC_APB1RSTR_SPI2RST_BIT)
    #define RCC_APB1RSTR_WWDRST             (1U << RCC_APB1RSTR_WWDRST_BIT)
    #define RCC_APB1RSTR_TIM14RST           (1U << RCC_APB1RSTR_TIM14RST_BIT)
    #define RCC_APB1RSTR_TIM13RST           (1U << RCC_APB1RSTR_TIM13RST_BIT)
    #define RCC_APB1RSTR_TIM12RST           (1U << RCC_APB1RSTR_TIM12RST_BIT)
    #define RCC_APB1RSTR_TIM7RST            (1U << RCC_APB1RSTR_TIM7RST_BIT)
    #define RCC_APB1RSTR_TIM6RST            (1U << RCC_APB1RSTR_TIM6RST_BIT)
    #define RCC_APB1RSTR_TIM5RST            (1U << RCC_APB1RSTR_TIM5RST_BIT)
    #define RCC_APB1RSTR_TIM4RST            (1U << RCC_APB1RSTR_TIM4RST_BIT)
    #define RCC_APB1RSTR_TIM3RST            (1U << RCC_APB1RSTR_TIM3RST_BIT)
    #define RCC_APB1RSTR_TIM2RST            (1U << RCC_APB1RSTR_TIM2RST_BIT)

Peripheral clock enable registers
+++++++++++++++++++++++++++++++++

::

    #define RCC_AHBENR_SDIOEN_BIT           10
    #define RCC_AHBENR_FSMCEN_BIT           8
    #define RCC_AHBENR_CRCEN_BIT            7
    #define RCC_AHBENR_FLITFEN_BIT          4
    #define RCC_AHBENR_SRAMEN_BIT           2
    #define RCC_AHBENR_DMA2EN_BIT           1
    #define RCC_AHBENR_DMA1EN_BIT           0

    #define RCC_AHBENR_SDIOEN               (1U << RCC_AHBENR_SDIOEN_BIT)
    #define RCC_AHBENR_FSMCEN               (1U << RCC_AHBENR_FSMCEN_BIT)
    #define RCC_AHBENR_CRCEN                (1U << RCC_AHBENR_CRCEN_BIT)
    #define RCC_AHBENR_FLITFEN              (1U << RCC_AHBENR_FLITFEN_BIT)
    #define RCC_AHBENR_SRAMEN               (1U << RCC_AHBENR_SRAMEN_BIT)
    #define RCC_AHBENR_DMA2EN               (1U << RCC_AHBENR_DMA2EN_BIT)
    #define RCC_AHBENR_DMA1EN               (1U << RCC_AHBENR_DMA1EN_BIT)

    #define RCC_APB2ENR_TIM11EN_BIT         21
    #define RCC_APB2ENR_TIM10EN_BIT         20
    #define RCC_APB2ENR_TIM9EN_BIT          19
    #define RCC_APB2ENR_ADC3EN_BIT          15
    #define RCC_APB2ENR_USART1EN_BIT        14
    #define RCC_APB2ENR_TIM8EN_BIT          13
    #define RCC_APB2ENR_SPI1EN_BIT          12
    #define RCC_APB2ENR_TIM1EN_BIT          11
    #define RCC_APB2ENR_ADC2EN_BIT          10
    #define RCC_APB2ENR_ADC1EN_BIT          9
    #define RCC_APB2ENR_IOPGEN_BIT          8
    #define RCC_APB2ENR_IOPFEN_BIT          7
    #define RCC_APB2ENR_IOPEEN_BIT          6
    #define RCC_APB2ENR_IOPDEN_BIT          5
    #define RCC_APB2ENR_IOPCEN_BIT          4
    #define RCC_APB2ENR_IOPBEN_BIT          3
    #define RCC_APB2ENR_IOPAEN_BIT          2
    #define RCC_APB2ENR_AFIOEN_BIT          0

    #define RCC_APB2ENR_TIM11EN             (1U << RCC_APB2ENR_TIM11EN_BIT)
    #define RCC_APB2ENR_TIM10EN             (1U << RCC_APB2ENR_TIM10EN_BIT)
    #define RCC_APB2ENR_TIM9EN              (1U << RCC_APB2ENR_TIM9EN_BIT)
    #define RCC_APB2ENR_ADC3EN              (1U << RCC_APB2ENR_ADC3EN_BIT)
    #define RCC_APB2ENR_USART1EN            (1U << RCC_APB2ENR_USART1EN_BIT)
    #define RCC_APB2ENR_TIM8EN              (1U << RCC_APB2ENR_TIM8EN_BIT)
    #define RCC_APB2ENR_SPI1EN              (1U << RCC_APB2ENR_SPI1EN_BIT)
    #define RCC_APB2ENR_TIM1EN              (1U << RCC_APB2ENR_TIM1EN_BIT)
    #define RCC_APB2ENR_ADC2EN              (1U << RCC_APB2ENR_ADC2EN_BIT)
    #define RCC_APB2ENR_ADC1EN              (1U << RCC_APB2ENR_ADC1EN_BIT)
    #define RCC_APB2ENR_IOPGEN              (1U << RCC_APB2ENR_IOPGEN_BIT)
    #define RCC_APB2ENR_IOPFEN              (1U << RCC_APB2ENR_IOPFEN_BIT)
    #define RCC_APB2ENR_IOPEEN              (1U << RCC_APB2ENR_IOPEEN_BIT)
    #define RCC_APB2ENR_IOPDEN              (1U << RCC_APB2ENR_IOPDEN_BIT)
    #define RCC_APB2ENR_IOPCEN              (1U << RCC_APB2ENR_IOPCEN_BIT)
    #define RCC_APB2ENR_IOPBEN              (1U << RCC_APB2ENR_IOPBEN_BIT)
    #define RCC_APB2ENR_IOPAEN              (1U << RCC_APB2ENR_IOPAEN_BIT)
    #define RCC_APB2ENR_AFIOEN              (1U << RCC_APB2ENR_AFIOEN_BIT)

    #define RCC_APB1ENR_DACEN_BIT           29
    #define RCC_APB1ENR_PWREN_BIT           28
    #define RCC_APB1ENR_BKPEN_BIT           27
    #define RCC_APB1ENR_CANEN_BIT           25
    #define RCC_APB1ENR_USBEN_BIT           23
    #define RCC_APB1ENR_I2C2EN_BIT          22
    #define RCC_APB1ENR_I2C1EN_BIT          21
    #define RCC_APB1ENR_UART5EN_BIT         20
    #define RCC_APB1ENR_UART4EN_BIT         19
    #define RCC_APB1ENR_USART3EN_BIT        18
    #define RCC_APB1ENR_USART2EN_BIT        17
    #define RCC_APB1ENR_SPI3EN_BIT          15
    #define RCC_APB1ENR_SPI2EN_BIT          14
    #define RCC_APB1ENR_WWDEN_BIT           11
    #define RCC_APB1ENR_TIM14EN_BIT         8
    #define RCC_APB1ENR_TIM13EN_BIT         7
    #define RCC_APB1ENR_TIM12EN_BIT         6
    #define RCC_APB1ENR_TIM7EN_BIT          5
    #define RCC_APB1ENR_TIM6EN_BIT          4
    #define RCC_APB1ENR_TIM5EN_BIT          3
    #define RCC_APB1ENR_TIM4EN_BIT          2
    #define RCC_APB1ENR_TIM3EN_BIT          1
    #define RCC_APB1ENR_TIM2EN_BIT          0

    #define RCC_APB1ENR_DACEN               (1U << RCC_APB1ENR_DACEN_BIT)
    #define RCC_APB1ENR_PWREN               (1U << RCC_APB1ENR_PWREN_BIT)
    #define RCC_APB1ENR_BKPEN               (1U << RCC_APB1ENR_BKPEN_BIT)
    #define RCC_APB1ENR_CANEN               (1U << RCC_APB1ENR_CANEN_BIT)
    #define RCC_APB1ENR_USBEN               (1U << RCC_APB1ENR_USBEN_BIT)
    #define RCC_APB1ENR_I2C2EN              (1U << RCC_APB1ENR_I2C2EN_BIT)
    #define RCC_APB1ENR_I2C1EN              (1U << RCC_APB1ENR_I2C1EN_BIT)
    #define RCC_APB1ENR_UART5EN             (1U << RCC_APB1ENR_UART5EN_BIT)
    #define RCC_APB1ENR_UART4EN             (1U << RCC_APB1ENR_UART4EN_BIT)
    #define RCC_APB1ENR_USART3EN            (1U << RCC_APB1ENR_USART3EN_BIT)
    #define RCC_APB1ENR_USART2EN            (1U << RCC_APB1ENR_USART2EN_BIT)
    #define RCC_APB1ENR_SPI3EN              (1U << RCC_APB1ENR_SPI3EN_BIT)
    #define RCC_APB1ENR_SPI2EN              (1U << RCC_APB1ENR_SPI2EN_BIT)
    #define RCC_APB1ENR_WWDEN               (1U << RCC_APB1ENR_WWDEN_BIT)
    #define RCC_APB1ENR_TIM14EN             (1U << RCC_APB1ENR_TIM14EN_BIT)
    #define RCC_APB1ENR_TIM13EN             (1U << RCC_APB1ENR_TIM13EN_BIT)
    #define RCC_APB1ENR_TIM12EN             (1U << RCC_APB1ENR_TIM12EN_BIT)
    #define RCC_APB1ENR_TIM7EN              (1U << RCC_APB1ENR_TIM7EN_BIT)
    #define RCC_APB1ENR_TIM6EN              (1U << RCC_APB1ENR_TIM6EN_BIT)
    #define RCC_APB1ENR_TIM5EN              (1U << RCC_APB1ENR_TIM5EN_BIT)
    #define RCC_APB1ENR_TIM4EN              (1U << RCC_APB1ENR_TIM4EN_BIT)
    #define RCC_APB1ENR_TIM3EN              (1U << RCC_APB1ENR_TIM3EN_BIT)
    #define RCC_APB1ENR_TIM2EN              (1U << RCC_APB1ENR_TIM2EN_BIT)

Backup domain control register
++++++++++++++++++++++++++++++

::

    #define RCC_BDCR_BDRST_BIT              16
    #define RCC_BDCR_RTCEN_BIT              15
    #define RCC_BDCR_LSEBYP_BIT             2
    #define RCC_BDCR_LSERDY_BIT             1
    #define RCC_BDCR_LSEON_BIT              0

    #define RCC_BDCR_BDRST                  (1U << RCC_BDCR_BDRST_BIT)
    #define RCC_BDCR_RTCEN                  (1U << RCC_BDCR_RTC_BIT)
    #define RCC_BDCR_RTCSEL                 (0x3 << 8)
    #define RCC_BDCR_RTCSEL_NONE            (0x0 << 8)
    #define RCC_BDCR_RTCSEL_LSE             (0x1 << 8)
    #define RCC_BDCR_RTCSEL_HSE             (0x3 << 8)
    #define RCC_BDCR_LSEBYP                 (1U << RCC_BDCR_LSEBYP_BIT)
    #define RCC_BDCR_LSERDY                 (1U << RCC_BDCR_LSERDY_BIT)
    #define RCC_BDCR_LSEON                  (1U << RCC_BDCR_LSEON_BIT)

Control/status register
+++++++++++++++++++++++

::

    #define RCC_CSR_LPWRRSTF_BIT            31
    #define RCC_CSR_WWDGRSTF_BIT            30
    #define RCC_CSR_IWDGRSTF_BIT            29
    #define RCC_CSR_SFTRSTF_BIT             28
    #define RCC_CSR_PORRSTF_BIT             27
    #define RCC_CSR_PINRSTF_BIT             26
    #define RCC_CSR_RMVF_BIT                24
    #define RCC_CSR_LSIRDY_BIT              1
    #define RCC_CSR_LSION_BIT               0

    #define RCC_CSR_LPWRRSTF                (1U << RCC_CSR_LPWRRSTF_BIT)
    #define RCC_CSR_WWDGRSTF                (1U << RCC_CSR_WWDGRSTF_BIT)
    #define RCC_CSR_IWDGRSTF                (1U << RCC_CSR_IWDGRSTF_BIT)
    #define RCC_CSR_SFTRSTF                 (1U << RCC_CSR_SFTRSTF_BIT)
    #define RCC_CSR_PORRSTF                 (1U << RCC_CSR_PORRSTF_BIT)
    #define RCC_CSR_PINRSTF                 (1U << RCC_CSR_PINRSTF_BIT)
    #define RCC_CSR_RMVF                    (1U << RCC_CSR_RMVF_BIT)
    #define RCC_CSR_LSIRDY                  (1U << RCC_CSR_LSIRDY_BIT)
    #define RCC_CSR_LSION                   (1U << RCC_CSR_LSION_BIT)

STM32F2 Targets
~~~~~~~~~~~~~~~

Clock control register
++++++++++++++++++++++

::

    #define RCC_CR_PLLI2SRDY_BIT            27
    #define RCC_CR_PLLI2SON_BIT             26
    #define RCC_CR_PLLRDY_BIT               25
    #define RCC_CR_PLLON_BIT                24
    #define RCC_CR_CSSON_BIT                19
    #define RCC_CR_HSEBYP_BIT               18
    #define RCC_CR_HSERDY_BIT               17
    #define RCC_CR_HSEON_BIT                16
    #define RCC_CR_HSIRDY_BIT               1
    #define RCC_CR_HSION_BIT                0

    #define RCC_CR_PLLI2SRDY                (1U << RCC_CR_PLLI2SRDY_BIT)
    #define RCC_CR_PLLI2SON                 (1U << RCC_CR_PLLI2SON_BIT)
    #define RCC_CR_PLLRDY                   (1U << RCC_CR_PLLRDY_BIT)
    #define RCC_CR_PLLON                    (1U << RCC_CR_PLLON_BIT)
    #define RCC_CR_CSSON                    (1U << RCC_CR_CSSON_BIT)
    #define RCC_CR_HSEBYP                   (1U << RCC_CR_HSEBYP_BIT)
    #define RCC_CR_HSERDY                   (1U << RCC_CR_HSERDY_BIT)
    #define RCC_CR_HSEON                    (1U << RCC_CR_HSEON_BIT)
    #define RCC_CR_HSICAL                   (0xFF << 8)
    #define RCC_CR_HSITRIM                  (0x1F << 3)
    #define RCC_CR_HSIRDY                   (1U << RCC_CR_HSIRDY_BIT)
    #define RCC_CR_HSION                    (1U << RCC_CR_HSION_BIT)

PLL configuration register
++++++++++++++++++++++++++

::

    #define RCC_PLLCFGR_PLLSRC_BIT          22

    #define RCC_PLLCFGR_PLLQ                (0xF << 24)
    #define RCC_PLLCFGR_PLLSRC              (1U << RCC_PLLCFGR_PLLSRC_BIT)
    #define RCC_PLLCFGR_PLLSRC_HSI          (0x0 << RCC_PLLCFGR_PLLSRC_BIT)
    #define RCC_PLLCFGR_PLLSRC_HSE          (0x1 << RCC_PLLCFGR_PLLSRC_BIT)
    #define RCC_PLLCFGR_PLLP                (0x3 << 16)
    #define RCC_PLLCFGR_PLLN                (0x1FF << 6)
    #define RCC_PLLCFGR_PLLM                0x1F

Clock configuration register
++++++++++++++++++++++++++++

::

    #define RCC_CFGR_I2SSRC_BIT             23

    #define RCC_CFGR_MCO2                   (0x3 << 30)
    #define RCC_CFGR_MCO2_SYSCLK            (0x0 << 30)
    #define RCC_CFGR_MCO2_PLLI2S            (0x1 << 30)
    #define RCC_CFGR_MCO2_HSE               (0x2 << 30)
    #define RCC_CFGR_MCO2_PLL               (0x3 << 30)

    #define RCC_CFGR_MCO2PRE                (0x7 << 27)
    #define RCC_CFGR_MCO2PRE_DIV_1          (0x0 << 27)
    #define RCC_CFGR_MCO2PRE_DIV_2          (0x4 << 27)
    #define RCC_CFGR_MCO2PRE_DIV_3          (0x5 << 27)
    #define RCC_CFGR_MCO2PRE_DIV_4          (0x6 << 27)
    #define RCC_CFGR_MCO2PRE_DIV_5          (0x7 << 27)

    #define RCC_CFGR_MCO1PRE                (0x7 << 24)
    #define RCC_CFGR_MCO1PRE_DIV_1          (0x0 << 24)
    #define RCC_CFGR_MCO1PRE_DIV_2          (0x4 << 24)
    #define RCC_CFGR_MCO1PRE_DIV_3          (0x5 << 24)
    #define RCC_CFGR_MCO1PRE_DIV_4          (0x6 << 24)
    #define RCC_CFGR_MCO1PRE_DIV_5          (0x7 << 24)

    #define RCC_CFGR_I2SSRC                 (1U << RCC_CFGR_I2SSRC_BIT)
    #define RCC_CFGR_I2SSRC_PLLI2S          (0 << RCC_CFGR_I2SSRC_BIT)
    #define RCC_CFGR_I2SSRC_I2S_CKIN        (1 << RCC_CFGR_I2SSRC_BIT)

    #define RCC_CFGR_MCO1                   (0x3 << 21)
    #define RCC_CFGR_MCO1_HSI               (0x0 << 21)
    #define RCC_CFGR_MCO1_LSE               (0x1 << 21)
    #define RCC_CFGR_MCO1_HSE               (0x2 << 21)
    #define RCC_CFGR_MCO1_PLL               (0x3 << 21)

    #define RCC_CFGR_RTCPRE                 (0x1F << 16)

    /* Skipped: all the 0b0xx values meaning "not divided" */
    #define RCC_CFGR_PPRE2                  (0x7 << 13)
    #define RCC_CFGR_PPRE2_AHB_DIV_2        (0x4 << 13)
    #define RCC_CFGR_PPRE2_AHB_DIV_4        (0x5 << 13)
    #define RCC_CFGR_PPRE2_AHB_DIV_8        (0x6 << 13)
    #define RCC_CFGR_PPRE2_AHB_DIV_16       (0x7 << 13)

    /* Skipped: all the 0b0xx values meaning "not divided" */
    #define RCC_CFGR_PPRE1                  (0x7 << 10)
    #define RCC_CFGR_PPRE1_AHB_DIV_2        (0x4 << 10)
    #define RCC_CFGR_PPRE1_AHB_DIV_4        (0x5 << 10)
    #define RCC_CFGR_PPRE1_AHB_DIV_8        (0x6 << 10)
    #define RCC_CFGR_PPRE1_AHB_DIV_16       (0x7 << 10)

    /* Skipped: all the 0b0xxx values meaning "not divided" */
    #define RCC_CFGR_HPRE                   (0xF << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_2      (0x8 << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_4      (0x9 << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_8      (0xA << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_16     (0xB << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_64     (0xC << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_128    (0xD << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_256    (0xE << 4)
    #define RCC_CFGR_HPRE_SYSCLK_DIV_512    (0xF << 4)

    #define RCC_CFGR_SWS                    (0x3 << 2)
    #define RCC_CFGR_SWS_HSI                (0x0 << 2)
    #define RCC_CFGR_SWS_HSE                (0x1 << 2)
    #define RCC_CFGR_SWS_PLL                (0x2 << 2)

    #define RCC_CFGR_SW                     0x3
    #define RCC_CFGR_SW_HSI                 0x0
    #define RCC_CFGR_SW_HSE                 0x1
    #define RCC_CFGR_SW_PLL                 0x2

Clock interrupt register
++++++++++++++++++++++++

::

    #define RCC_CIR_CSSC_BIT                23

    #define RCC_CIR_PLLI2SRDYC_BIT          21
    #define RCC_CIR_PLLRDYC_BIT             20
    #define RCC_CIR_HSERDYC_BIT             19
    #define RCC_CIR_HSIRDYC_BIT             18
    #define RCC_CIR_LSERDYC_BIT             17
    #define RCC_CIR_LSIRDYC_BIT             16

    #define RCC_CIR_PLLI2SRDYIE_BIT         13
    #define RCC_CIR_PLLRDYIE_BIT            12
    #define RCC_CIR_HSERDYIE_BIT            11
    #define RCC_CIR_HSIRDYIE_BIT            10
    #define RCC_CIR_LSERDYIE_BIT            9
    #define RCC_CIR_LSIRDYIE_BIT            8

    #define RCC_CIR_CSSF_BIT                7

    #define RCC_CIR_PLLI2SRDYF_BIT          5
    #define RCC_CIR_PLLRDYF_BIT             4
    #define RCC_CIR_HSERDYF_BIT             3
    #define RCC_CIR_HSIRDYF_BIT             2
    #define RCC_CIR_LSERDYF_BIT             1
    #define RCC_CIR_LSIRDYF_BIT             0

    #define RCC_CIR_CSSC                    (1U << RCC_CIR_CSSC_BIT)

    #define RCC_CIR_PLLI2SRDYC              (1U << RCC_CIR_PLLI2SRDYC_BIT)
    #define RCC_CIR_PLLRDYC                 (1U << RCC_CIR_PLLRDYC_BIT)
    #define RCC_CIR_HSERDYC                 (1U << RCC_CIR_HSERDYC_BIT)
    #define RCC_CIR_HSIRDYC                 (1U << RCC_CIR_HSIRDYC_BIT)
    #define RCC_CIR_LSERDYC                 (1U << RCC_CIR_LSERDYC_BIT)
    #define RCC_CIR_LSIRDYC                 (1U << RCC_CIR_LSIRDYC_BIT)

    #define RCC_CIR_PLLI2SRDYIE             (1U << RCC_CIR_PLLI2SRDYIE_BIT)
    #define RCC_CIR_PLLRDYIE                (1U << RCC_CIR_PLLRDYIE_BIT)
    #define RCC_CIR_HSERDYIE                (1U << RCC_CIR_HSERDYIE_BIT)
    #define RCC_CIR_HSIRDYIE                (1U << RCC_CIR_HSIRDYIE_BIT)
    #define RCC_CIR_LSERDYIE                (1U << RCC_CIR_LSERDYIE_BIT)
    #define RCC_CIR_LSIRDYIE                (1U << RCC_CIR_LSIRDYIE_BIT)

    #define RCC_CIR_CSSF                    (1U << RCC_CIR_CSSF_BIT)

    #define RCC_CIR_PLLI2SRDYF              (1U << RCC_CIR_PLLI2SRDYF_BIT)
    #define RCC_CIR_PLLRDYF                 (1U << RCC_CIR_PLLRDYF_BIT)
    #define RCC_CIR_HSERDYF                 (1U << RCC_CIR_HSERDYF_BIT)
    #define RCC_CIR_HSIRDYF                 (1U << RCC_CIR_HSIRDYF_BIT)
    #define RCC_CIR_LSERDYF                 (1U << RCC_CIR_LSERDYF_BIT)
    #define RCC_CIR_LSIRDYF                 (1U << RCC_CIR_LSIRDYF_BIT)

Peripheral reset registers
++++++++++++++++++++++++++

::

    /* AHB1 */

    #define RCC_AHB1RSTR_OTGHSRST_BIT       29
    #define RCC_AHB1RSTR_ETHMACRST_BIT      25
    #define RCC_AHB1RSTR_DMA2RST_BIT        22
    #define RCC_AHB1RSTR_DMA1RST_BIT        21
    #define RCC_AHB1RSTR_CRCRST_BIT         12
    #define RCC_AHB1RSTR_GPIOIRST_BIT       8
    #define RCC_AHB1RSTR_GPIOHRST_BIT       7
    #define RCC_AHB1RSTR_GPIOGRST_BIT       6
    #define RCC_AHB1RSTR_GPIOFRST_BIT       5
    #define RCC_AHB1RSTR_GPIOERST_BIT       4
    #define RCC_AHB1RSTR_GPIODRST_BIT       3
    #define RCC_AHB1RSTR_GPIOCRST_BIT       2
    #define RCC_AHB1RSTR_GPIOBRST_BIT       1
    #define RCC_AHB1RSTR_GPIOARST_BIT       0

    #define RCC_AHB1RSTR_OTGHSRST           (1U << RCC_AHB1RSTR_OTGHSRST_BIT)
    #define RCC_AHB1RSTR_ETHMACRST          (1U << RCC_AHB1RSTR_ETHMACRST_BIT)
    #define RCC_AHB1RSTR_DMA2RST            (1U << RCC_AHB1RSTR_DMA2RST_BIT)
    #define RCC_AHB1RSTR_DMA1RST            (1U << RCC_AHB1RSTR_DMA1RST_BIT)
    #define RCC_AHB1RSTR_CRCRST             (1U << RCC_AHB1RSTR_CRCRST_BIT)
    #define RCC_AHB1RSTR_GPIOIRST           (1U << RCC_AHB1RSTR_GPIOIRST_BIT)
    #define RCC_AHB1RSTR_GPIOHRST           (1U << RCC_AHB1RSTR_GPIOHRST_BIT)
    #define RCC_AHB1RSTR_GPIOGRST           (1U << RCC_AHB1RSTR_GPIOGRST_BIT)
    #define RCC_AHB1RSTR_GPIOFRST           (1U << RCC_AHB1RSTR_GPIOFRST_BIT)
    #define RCC_AHB1RSTR_GPIOERST           (1U << RCC_AHB1RSTR_GPIOERST_BIT)
    #define RCC_AHB1RSTR_GPIODRST           (1U << RCC_AHB1RSTR_GPIODRST_BIT)
    #define RCC_AHB1RSTR_GPIOCRST           (1U << RCC_AHB1RSTR_GPIOCRST_BIT)
    #define RCC_AHB1RSTR_GPIOBRST           (1U << RCC_AHB1RSTR_GPIOBRST_BIT)
    #define RCC_AHB1RSTR_GPIOARST           (1U << RCC_AHB1RSTR_GPIOARST_BIT)

    /* AHB2 */

    #define RCC_AHB2RSTR_OTGFSRST_BIT       7
    #define RCC_AHB2RSTR_RNGRST_BIT         6
    #define RCC_AHB2RSTR_HASHRST_BIT        5
    #define RCC_AHB2RSTR_CRYPRST_BIT        4
    #define RCC_AHB2RSTR_DCMIRST_BIT        0

    #define RCC_AHB2RSTR_OTGFSRST           (1U << RCC_AHB2RSTR_OTGFSRST_BIT)
    #define RCC_AHB2RSTR_RNGRST             (1U << RCC_AHB2RSTR_RNGRST_BIT)
    #define RCC_AHB2RSTR_HASHRST            (1U << RCC_AHB2RSTR_HASHRST_BIT)
    #define RCC_AHB2RSTR_CRYPRST            (1U << RCC_AHB2RSTR_CRYPRST_BIT)
    #define RCC_AHB2RSTR_DCMIRST            (1U << RCC_AHB2RSTR_DCMIRST_BIT)

    /* AHB3 */

    #define RCC_AHB3RSTR_FSMCRST_BIT        0

    #define RCC_AHB3RSTR_FSMCRST            (1U << RCC_AHB3RSTR_FSMCRST_BIT)

    /* APB1 */

    #define RCC_APB1RSTR_DACRST_BIT         29
    #define RCC_APB1RSTR_PWRRST_BIT         28
    #define RCC_APB1RSTR_CAN2RST_BIT        26
    #define RCC_APB1RSTR_CAN1RST_BIT        25
    #define RCC_APB1RSTR_I2C3RST_BIT        23
    #define RCC_APB1RSTR_I2C2RST_BIT        22
    #define RCC_APB1RSTR_I2C1RST_BIT        21
    #define RCC_APB1RSTR_UART5RST_BIT       20
    #define RCC_APB1RSTR_UART4RST_BIT       19
    #define RCC_APB1RSTR_UART3RST_BIT       18
    #define RCC_APB1RSTR_UART2RST_BIT       17
    #define RCC_APB1RSTR_SPI3RST_BIT        15
    #define RCC_APB1RSTR_SPI2RST_BIT        14
    #define RCC_APB1RSTR_WWDGRST_BIT        11
    #define RCC_APB1RSTR_TIM14RST_BIT       8
    #define RCC_APB1RSTR_TIM13RST_BIT       7
    #define RCC_APB1RSTR_TIM12RST_BIT       6
    #define RCC_APB1RSTR_TIM7RST_BIT        5
    #define RCC_APB1RSTR_TIM6RST_BIT        4
    #define RCC_APB1RSTR_TIM5RST_BIT        3
    #define RCC_APB1RSTR_TIM4RST_BIT        2
    #define RCC_APB1RSTR_TIM3RST_BIT        1
    #define RCC_APB1RSTR_TIM2RST_BIT        0

    #define RCC_APB1RSTR_DACRST             (1U << RCC_APB1RSTR_DACRST_BIT)
    #define RCC_APB1RSTR_PWRRST             (1U << RCC_APB1RSTR_PWRRST_BIT)
    #define RCC_APB1RSTR_CAN2RST            (1U << RCC_APB1RSTR_CAN2RST_BIT)
    #define RCC_APB1RSTR_CAN1RST            (1U << RCC_APB1RSTR_CAN1RST_BIT)
    #define RCC_APB1RSTR_I2C3RST            (1U << RCC_APB1RSTR_I2C3RST_BIT)
    #define RCC_APB1RSTR_I2C2RST            (1U << RCC_APB1RSTR_I2C2RST_BIT)
    #define RCC_APB1RSTR_I2C1RST            (1U << RCC_APB1RSTR_I2C1RST_BIT)
    #define RCC_APB1RSTR_UART5RST           (1U << RCC_APB1RSTR_UART5RST_BIT)
    #define RCC_APB1RSTR_UART4RST           (1U << RCC_APB1RSTR_UART4RST_BIT)
    #define RCC_APB1RSTR_UART3RST           (1U << RCC_APB1RSTR_UART3RST_BIT)
    #define RCC_APB1RSTR_UART2RST           (1U << RCC_APB1RSTR_UART2RST_BIT)
    #define RCC_APB1RSTR_SPI3RST            (1U << RCC_APB1RSTR_SPI3RST_BIT)
    #define RCC_APB1RSTR_SPI2RST            (1U << RCC_APB1RSTR_SPI2RST_BIT)
    #define RCC_APB1RSTR_WWDGRST            (1U << RCC_APB1RSTR_WWDGRST_BIT)
    #define RCC_APB1RSTR_TIM14RST           (1U << RCC_APB1RSTR_TIM14RST_BIT)
    #define RCC_APB1RSTR_TIM13RST           (1U << RCC_APB1RSTR_TIM13RST_BIT)
    #define RCC_APB1RSTR_TIM12RST           (1U << RCC_APB1RSTR_TIM12RST_BIT)
    #define RCC_APB1RSTR_TIM7RST            (1U << RCC_APB1RSTR_TIM7RST_BIT)
    #define RCC_APB1RSTR_TIM6RST            (1U << RCC_APB1RSTR_TIM6RST_BIT)
    #define RCC_APB1RSTR_TIM5RST            (1U << RCC_APB1RSTR_TIM5RST_BIT)
    #define RCC_APB1RSTR_TIM4RST            (1U << RCC_APB1RSTR_TIM4RST_BIT)
    #define RCC_APB1RSTR_TIM3RST            (1U << RCC_APB1RSTR_TIM3RST_BIT)
    #define RCC_APB1RSTR_TIM2RST            (1U << RCC_APB1RSTR_TIM2RST_BIT)

    /* APB2 */

    #define RCC_APB2RSTR_TIM11RST_BIT       18
    #define RCC_APB2RSTR_TIM10RST_BIT       17
    #define RCC_APB2RSTR_TIM9RST_BIT        16
    #define RCC_APB2RSTR_SYSCFGRST_BIT      14
    #define RCC_APB2RSTR_SPI1RST_BIT        12
    #define RCC_APB2RSTR_SDIORST_BIT        11
    #define RCC_APB2RSTR_ADCRST_BIT         8
    #define RCC_APB2RSTR_USART6RST_BIT      5
    #define RCC_APB2RSTR_USART1RST_BIT      4
    #define RCC_APB2RSTR_TIM8RST_BIT        1
    #define RCC_APB2RSTR_TIM1RST_BIT        0

    #define RCC_APB2RSTR_TIM11RST           (1U << RCC_APB2RSTR_TIM11RST_BIT)
    #define RCC_APB2RSTR_TIM10RST           (1U << RCC_APB2RSTR_TIM10RST_BIT)
    #define RCC_APB2RSTR_TIM9RST            (1U << RCC_APB2RSTR_TIM9RST_BIT)
    #define RCC_APB2RSTR_SYSCFGRST          (1U << RCC_APB2RSTR_SYSCFGRST_BIT)
    #define RCC_APB2RSTR_SPI1RST            (1U << RCC_APB2RSTR_SPI1RST_BIT)
    #define RCC_APB2RSTR_SDIORST            (1U << RCC_APB2RSTR_SDIORST_BIT)
    #define RCC_APB2RSTR_ADCRST             (1U << RCC_APB2RSTR_ADCRST_BIT)
    #define RCC_APB2RSTR_USART6RST          (1U << RCC_APB2RSTR_USART6RST_BIT)
    #define RCC_APB2RSTR_USART1RST          (1U << RCC_APB2RSTR_USART1RST_BIT)
    #define RCC_APB2RSTR_TIM8RST            (1U << RCC_APB2RSTR_TIM8RST_BIT)
    #define RCC_APB2RSTR_TIM1RST            (1U << RCC_APB2RSTR_TIM1RST_BIT)

Peripheral clock enable registers
+++++++++++++++++++++++++++++++++

::

    /* AHB1 */

    #define RCC_AHB1ENR_OTGHSULPIEN_BIT     30
    #define RCC_AHB1ENR_OTGHSEN_BIT         29
    #define RCC_AHB1ENR_ETHMACPTPEN_BIT     28
    #define RCC_AHB1ENR_ETHMACRXEN_BIT      27
    #define RCC_AHB1ENR_ETHMACTXEN_BIT      26
    #define RCC_AHB1ENR_ETHMACEN_BIT        25
    #define RCC_AHB1ENR_DMA2EN_BIT          22
    #define RCC_AHB1ENR_DMA1EN_BIT          21
    #define RCC_AHB1ENR_BKPSRAMEN_BIT       18
    #define RCC_AHB1ENR_CRCEN_BIT           12
    #define RCC_AHB1ENR_GPIOIEN_BIT         8
    #define RCC_AHB1ENR_GPIOHEN_BIT         7
    #define RCC_AHB1ENR_GPIOGEN_BIT         6
    #define RCC_AHB1ENR_GPIOFEN_BIT         5
    #define RCC_AHB1ENR_GPIOEEN_BIT         4
    #define RCC_AHB1ENR_GPIODEN_BIT         3
    #define RCC_AHB1ENR_GPIOCEN_BIT         2
    #define RCC_AHB1ENR_GPIOBEN_BIT         1
    #define RCC_AHB1ENR_GPIOAEN_BIT         0

    #define RCC_AHB1ENR_OTGHSULPIEN         (1U << RCC_AHB1ENR_OTGHSULPIEN_BIT)
    #define RCC_AHB1ENR_OTGHSEN             (1U << RCC_AHB1ENR_OTGHSEN_BIT)
    #define RCC_AHB1ENR_ETHMACPTPEN         (1U << RCC_AHB1ENR_ETHMACPTPEN_BIT)
    #define RCC_AHB1ENR_ETHMACRXEN          (1U << RCC_AHB1ENR_ETHMACRXEN_BIT)
    #define RCC_AHB1ENR_ETHMACTXEN          (1U << RCC_AHB1ENR_ETHMACTXEN_BIT)
    #define RCC_AHB1ENR_ETHMACEN            (1U << RCC_AHB1ENR_ETHMACEN_BIT)
    #define RCC_AHB1ENR_DMA2EN              (1U << RCC_AHB1ENR_DMA2EN_BIT)
    #define RCC_AHB1ENR_DMA1EN              (1U << RCC_AHB1ENR_DMA1EN_BIT)
    #define RCC_AHB1ENR_BKPSRAMEN           (1U << RCC_AHB1ENR_BKPSRAMEN_BIT)
    #define RCC_AHB1ENR_CRCEN               (1U << RCC_AHB1ENR_CRCEN_BIT)
    #define RCC_AHB1ENR_GPIOIEN             (1U << RCC_AHB1ENR_GPIOIEN_BIT)
    #define RCC_AHB1ENR_GPIOHEN             (1U << RCC_AHB1ENR_GPIOHEN_BIT)
    #define RCC_AHB1ENR_GPIOGEN             (1U << RCC_AHB1ENR_GPIOGEN_BIT)
    #define RCC_AHB1ENR_GPIOFEN             (1U << RCC_AHB1ENR_GPIOFEN_BIT)
    #define RCC_AHB1ENR_GPIOEEN             (1U << RCC_AHB1ENR_GPIOEEN_BIT)
    #define RCC_AHB1ENR_GPIODEN             (1U << RCC_AHB1ENR_GPIODEN_BIT)
    #define RCC_AHB1ENR_GPIOCEN             (1U << RCC_AHB1ENR_GPIOCEN_BIT)
    #define RCC_AHB1ENR_GPIOBEN             (1U << RCC_AHB1ENR_GPIOBEN_BIT)
    #define RCC_AHB1ENR_GPIOAEN             (1U << RCC_AHB1ENR_GPIOAEN_BIT)

    /* AHB2 */

    #define RCC_AHB2ENR_OTGFSEN_BIT         7
    #define RCC_AHB2ENR_RNGEN_BIT           6
    #define RCC_AHB2ENR_HASHEN_BIT          5
    #define RCC_AHB2ENR_CRYPEN_BIT          4
    #define RCC_AHB2ENR_DCMIEN_BIT          0

    #define RCC_AHB2ENR_OTGFSEN             (1U << RCC_AHB2ENR_OTGFSEN_BIT)
    #define RCC_AHB2ENR_RNGEN               (1U << RCC_AHB2ENR_RNGEN_BIT)
    #define RCC_AHB2ENR_HASHEN              (1U << RCC_AHB2ENR_HASHEN_BIT)
    #define RCC_AHB2ENR_CRYPEN              (1U << RCC_AHB2ENR_CRYPEN_BIT)
    #define RCC_AHB2ENR_DCMIEN              (1U << RCC_AHB2ENR_DCMIEN_BIT)

    /* AHB3 */

    #define RCC_AHB3ENR_FSMCEN_BIT          0

    #define RCC_AHB3ENR_FSMCEN              (1U << RCC_AHB3ENR_FSMCEN_BIT)

    /* APB1 */

    #define RCC_APB1ENR_DACEN_BIT           29
    #define RCC_APB1ENR_PWREN_BIT           28
    #define RCC_APB1ENR_CAN2EN_BIT          26
    #define RCC_APB1ENR_CAN1EN_BIT          25
    #define RCC_APB1ENR_I2C3EN_BIT          23
    #define RCC_APB1ENR_I2C2EN_BIT          22
    #define RCC_APB1ENR_I2C1EN_BIT          21
    #define RCC_APB1ENR_UART5EN_BIT         20
    #define RCC_APB1ENR_UART4EN_BIT         19
    #define RCC_APB1ENR_USART3EN_BIT        18
    #define RCC_APB1ENR_USART2EN_BIT        17
    #define RCC_APB1ENR_SPI3EN_BIT          15
    #define RCC_APB1ENR_SPI2EN_BIT          14
    #define RCC_APB1ENR_WWDGEN_BIT          11
    #define RCC_APB1ENR_TIM14EN_BIT         8
    #define RCC_APB1ENR_TIM13EN_BIT         7
    #define RCC_APB1ENR_TIM12EN_BIT         6
    #define RCC_APB1ENR_TIM7EN_BIT          5
    #define RCC_APB1ENR_TIM6EN_BIT          4
    #define RCC_APB1ENR_TIM5EN_BIT          3
    #define RCC_APB1ENR_TIM4EN_BIT          2
    #define RCC_APB1ENR_TIM3EN_BIT          1
    #define RCC_APB1ENR_TIM2EN_BIT          0

    #define RCC_APB1ENR_DACEN               (1U << RCC_APB1ENR_DACEN_BIT)
    #define RCC_APB1ENR_PWREN               (1U << RCC_APB1ENR_PWREN_BIT)
    #define RCC_APB1ENR_CAN2EN              (1U << RCC_APB1ENR_CAN2EN_BIT)
    #define RCC_APB1ENR_CAN1EN              (1U << RCC_APB1ENR_CAN1EN_BIT)
    #define RCC_APB1ENR_I2C3EN              (1U << RCC_APB1ENR_I2C3EN_BIT)
    #define RCC_APB1ENR_I2C2EN              (1U << RCC_APB1ENR_I2C2EN_BIT)
    #define RCC_APB1ENR_I2C1EN              (1U << RCC_APB1ENR_I2C1EN_BIT)
    #define RCC_APB1ENR_UART5EN             (1U << RCC_APB1ENR_UART5EN_BIT)
    #define RCC_APB1ENR_UART4EN             (1U << RCC_APB1ENR_UART4EN_BIT)
    #define RCC_APB1ENR_USART3EN            (1U << RCC_APB1ENR_USART3EN_BIT)
    #define RCC_APB1ENR_USART2EN            (1U << RCC_APB1ENR_USART2EN_BIT)
    #define RCC_APB1ENR_SPI3EN              (1U << RCC_APB1ENR_SPI3EN_BIT)
    #define RCC_APB1ENR_SPI2EN              (1U << RCC_APB1ENR_SPI2EN_BIT)
    #define RCC_APB1ENR_WWDGEN              (1U << RCC_APB1ENR_WWDGEN_BIT)
    #define RCC_APB1ENR_TIM14EN             (1U << RCC_APB1ENR_TIM14EN_BIT)
    #define RCC_APB1ENR_TIM13EN             (1U << RCC_APB1ENR_TIM13EN_BIT)
    #define RCC_APB1ENR_TIM12EN             (1U << RCC_APB1ENR_TIM12EN_BIT)
    #define RCC_APB1ENR_TIM7EN              (1U << RCC_APB1ENR_TIM7EN_BIT)
    #define RCC_APB1ENR_TIM6EN              (1U << RCC_APB1ENR_TIM6EN_BIT)
    #define RCC_APB1ENR_TIM5EN              (1U << RCC_APB1ENR_TIM5EN_BIT)
    #define RCC_APB1ENR_TIM4EN              (1U << RCC_APB1ENR_TIM4EN_BIT)
    #define RCC_APB1ENR_TIM3EN              (1U << RCC_APB1ENR_TIM3EN_BIT)
    #define RCC_APB1ENR_TIM2EN              (1U << RCC_APB1ENR_TIM2EN_BIT)

    /* APB2 */

    #define RCC_APB2ENR_TIM11EN_BIT         18
    #define RCC_APB2ENR_TIM10EN_BIT         17
    #define RCC_APB2ENR_TIM9EN_BIT          16
    #define RCC_APB2ENR_SYSCFGEN_BIT        14
    #define RCC_APB2ENR_SPI1EN_BIT          12
    #define RCC_APB2ENR_SDIOEN_BIT          11
    #define RCC_APB2ENR_ADC3EN_BIT          10
    #define RCC_APB2ENR_ADC2EN_BIT          9
    #define RCC_APB2ENR_ADC1EN_BIT          8
    #define RCC_APB2ENR_USART6EN_BIT        5
    #define RCC_APB2ENR_USART1EN_BIT        4
    #define RCC_APB2ENR_TIM8EN_BIT          1
    #define RCC_APB2ENR_TIM1EN_BIT          0

    #define RCC_APB2ENR_TIM11EN             (1U << RCC_APB2ENR_TIM11EN_BIT)
    #define RCC_APB2ENR_TIM10EN             (1U << RCC_APB2ENR_TIM10EN_BIT)
    #define RCC_APB2ENR_TIM9EN              (1U << RCC_APB2ENR_TIM9EN_BIT)
    #define RCC_APB2ENR_SYSCFGEN            (1U << RCC_APB2ENR_SYSCFGEN_BIT)
    #define RCC_APB2ENR_SPI1EN              (1U << RCC_APB2ENR_SPI1EN_BIT)
    #define RCC_APB2ENR_SDIOEN              (1U << RCC_APB2ENR_SDIOEN_BIT)
    #define RCC_APB2ENR_ADC3EN              (1U << RCC_APB2ENR_ADC3EN_BIT)
    #define RCC_APB2ENR_ADC2EN              (1U << RCC_APB2ENR_ADC2EN_BIT)
    #define RCC_APB2ENR_ADC1EN              (1U << RCC_APB2ENR_ADC1EN_BIT)
    #define RCC_APB2ENR_USART6EN            (1U << RCC_APB2ENR_USART6EN_BIT)
    #define RCC_APB2ENR_USART1EN            (1U << RCC_APB2ENR_USART1EN_BIT)
    #define RCC_APB2ENR_TIM8EN              (1U << RCC_APB2ENR_TIM8EN_BIT)
    #define RCC_APB2ENR_TIM1EN              (1U << RCC_APB2ENR_TIM1EN_BIT)

Peripheral clock enable in low power mode registers
+++++++++++++++++++++++++++++++++++++++++++++++++++

::

    /* AHB1 */

    #define RCC_AHB1LPENR_OTGHSULPILPEN_BIT 30
    #define RCC_AHB1LPENR_OTGHSLPEN_BIT     29
    #define RCC_AHB1LPENR_ETHMACPTPLPEN_BIT 28
    #define RCC_AHB1LPENR_ETHMACRXLPEN_BIT  27
    #define RCC_AHB1LPENR_ETHMACTXLPEN_BIT  26
    #define RCC_AHB1LPENR_ETHMACLPEN_BIT    25
    #define RCC_AHB1LPENR_DMA2LPEN_BIT      22
    #define RCC_AHB1LPENR_DMA1LPEN_BIT      21
    #define RCC_AHB1LPENR_BKPSRAMLPEN_BIT   18
    #define RCC_AHB1LPENR_SRAM2LPEN_BIT     17
    #define RCC_AHB1LPENR_SRAM1LPEN_BIT     16
    #define RCC_AHB1LPENR_FLITFLPEN_BIT     15
    #define RCC_AHB1LPENR_CRCLPEN_BIT       12
    #define RCC_AHB1LPENR_GPIOILPEN_BIT     8
    #define RCC_AHB1LPENR_GPIOGLPEN_BIT     6
    #define RCC_AHB1LPENR_GPIOFLPEN_BIT     5
    #define RCC_AHB1LPENR_GPIOELPEN_BIT     4
    #define RCC_AHB1LPENR_GPIODLPEN_BIT     3
    #define RCC_AHB1LPENR_GPIOCLPEN_BIT     2
    #define RCC_AHB1LPENR_GPIOBLPEN_BIT     1
    #define RCC_AHB1LPENR_GPIOALPEN_BIT     0

    #define RCC_AHB1LPENR_OTGHSULPILPEN     (1U << RCC_AHB1LPENR_OTGHSULPILPEN_BIT)
    #define RCC_AHB1LPENR_OTGHSLPEN         (1U << RCC_AHB1LPENR_OTGHSLPEN_BIT)
    #define RCC_AHB1LPENR_ETHMACPTPLPEN     (1U << RCC_AHB1LPENR_ETHMACPTPLPEN_BIT)
    #define RCC_AHB1LPENR_ETHMACRXLPEN      (1U << RCC_AHB1LPENR_ETHMACRXLPEN_BIT)
    #define RCC_AHB1LPENR_ETHMACTXLPEN      (1U << RCC_AHB1LPENR_ETHMACTXLPEN_BIT)
    #define RCC_AHB1LPENR_ETHMACLPEN        (1U << RCC_AHB1LPENR_ETHMACLPEN_BIT)
    #define RCC_AHB1LPENR_DMA2LPEN          (1U << RCC_AHB1LPENR_DMA2LPEN_BIT)
    #define RCC_AHB1LPENR_DMA1LPEN          (1U << RCC_AHB1LPENR_DMA1LPEN_BIT)
    #define RCC_AHB1LPENR_BKPSRAMLPEN       (1U << RCC_AHB1LPENR_BKPSRAMLPEN_BIT)
    #define RCC_AHB1LPENR_SRAM2LPEN         (1U << RCC_AHB1LPENR_SRAM2LPEN_BIT)
    #define RCC_AHB1LPENR_SRAM1LPEN         (1U << RCC_AHB1LPENR_SRAM1LPEN_BIT)
    #define RCC_AHB1LPENR_FLITFLPEN         (1U << RCC_AHB1LPENR_FLITFLPEN_BIT)
    #define RCC_AHB1LPENR_CRCLPEN           (1U << RCC_AHB1LPENR_CRCLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOILPEN         (1U << RCC_AHB1LPENR_GPIOILPEN_BIT)
    #define RCC_AHB1LPENR_GPIOGLPEN         (1U << RCC_AHB1LPENR_GPIOGLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOFLPEN         (1U << RCC_AHB1LPENR_GPIOFLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOELPEN         (1U << RCC_AHB1LPENR_GPIOELPEN_BIT)
    #define RCC_AHB1LPENR_GPIODLPEN         (1U << RCC_AHB1LPENR_GPIODLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOCLPEN         (1U << RCC_AHB1LPENR_GPIOCLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOBLPEN         (1U << RCC_AHB1LPENR_GPIOBLPEN_BIT)
    #define RCC_AHB1LPENR_GPIOALPEN         (1U << RCC_AHB1LPENR_GPIOALPEN_BIT)

    /* AHB2 */

    #define RCC_AHB2LPENR_OTGFSLPEN_BIT     7
    #define RCC_AHB2LPENR_RNGLPEN_BIT       6
    #define RCC_AHB2LPENR_HASHLPEN_BIT      5
    #define RCC_AHB2LPENR_CRYPLPEN_BIT      4
    #define RCC_AHB2LPENR_DCMILPEN_BIT      0

    #define RCC_AHB2LPENR_OTGFSLPEN         (1U << RCC_AHB2LPENR_OTGFSLPEN_BIT)
    #define RCC_AHB2LPENR_RNGLPEN           (1U << RCC_AHB2LPENR_RNGLPEN_BIT)
    #define RCC_AHB2LPENR_HASHLPEN          (1U << RCC_AHB2LPENR_HASHLPEN_BIT)
    #define RCC_AHB2LPENR_CRYPLPEN          (1U << RCC_AHB2LPENR_CRYPLPEN_BIT)
    #define RCC_AHB2LPENR_DCMILPEN          (1U << RCC_AHB2LPENR_DCMILPEN_BIT)

    /* AHB3 */

    #define RCC_AHB3LPENR_FSMCLPEN_BIT      0

    #define RCC_AHB3LPENR_FSMCLPEN          (1U << RCC_AHB3LPENR_FSMCLPEN_BIT)

    /* APB1 */

    #define RCC_APB1LPENR_DACLPEN_BIT       29
    #define RCC_APB1LPENR_PWRLPEN_BIT       28
    #define RCC_APB1LPENR_CAN2LPEN_BIT      26
    #define RCC_APB1LPENR_CAN1LPEN_BIT      25
    #define RCC_APB1LPENR_I2C3LPEN_BIT      23
    #define RCC_APB1LPENR_I2C2LPEN_BIT      22
    #define RCC_APB1LPENR_I2C1LPEN_BIT      21
    #define RCC_APB1LPENR_UART5LPEN_BIT     20
    #define RCC_APB1LPENR_UART4LPEN_BIT     19
    #define RCC_APB1LPENR_USART3LPEN_BIT    18
    #define RCC_APB1LPENR_USART2LPEN_BIT    17
    #define RCC_APB1LPENR_SPI3LPEN_BIT      15
    #define RCC_APB1LPENR_SPI2LPEN_BIT      14
    #define RCC_APB1LPENR_WWDGLPEN_BIT      11
    #define RCC_APB1LPENR_TIM14LPEN_BIT     8
    #define RCC_APB1LPENR_TIM13LPEN_BIT     7
    #define RCC_APB1LPENR_TIM12LPEN_BIT     6
    #define RCC_APB1LPENR_TIM7LPEN_BIT      5
    #define RCC_APB1LPENR_TIM6LPEN_BIT      4
    #define RCC_APB1LPENR_TIM5LPEN_BIT      3
    #define RCC_APB1LPENR_TIM4LPEN_BIT      2
    #define RCC_APB1LPENR_TIM3LPEN_BIT      1
    #define RCC_APB1LPENR_TIM2LPEN_BIT      0

    #define RCC_APB1LPENR_DACLPEN           (1U << RCC_APB1LPENR_DACLPEN_BIT)
    #define RCC_APB1LPENR_PWRLPEN           (1U << RCC_APB1LPENR_PWRLPEN_BIT)
    #define RCC_APB1LPENR_CAN2LPEN          (1U << RCC_APB1LPENR_CAN2LPEN_BIT)
    #define RCC_APB1LPENR_CAN1LPEN          (1U << RCC_APB1LPENR_CAN1LPEN_BIT)
    #define RCC_APB1LPENR_I2C3LPEN          (1U << RCC_APB1LPENR_I2C3LPEN_BIT)
    #define RCC_APB1LPENR_I2C2LPEN          (1U << RCC_APB1LPENR_I2C2LPEN_BIT)
    #define RCC_APB1LPENR_I2C1LPEN          (1U << RCC_APB1LPENR_I2C1LPEN_BIT)
    #define RCC_APB1LPENR_UART5LPEN         (1U << RCC_APB1LPENR_UART5LPEN_BIT)
    #define RCC_APB1LPENR_UART4LPEN         (1U << RCC_APB1LPENR_UART4LPEN_BIT)
    #define RCC_APB1LPENR_USART3LPEN        (1U << RCC_APB1LPENR_USART3LPEN_BIT)
    #define RCC_APB1LPENR_USART2LPEN        (1U << RCC_APB1LPENR_USART2LPEN_BIT)
    #define RCC_APB1LPENR_SPI3LPEN          (1U << RCC_APB1LPENR_SPI3LPEN_BIT)
    #define RCC_APB1LPENR_SPI2LPEN          (1U << RCC_APB1LPENR_SPI2LPEN_BIT)
    #define RCC_APB1LPENR_WWDGLPEN          (1U << RCC_APB1LPENR_WWDGLPEN_BIT)
    #define RCC_APB1LPENR_TIM14LPEN         (1U << RCC_APB1LPENR_TIM14LPEN_BIT)
    #define RCC_APB1LPENR_TIM13LPEN         (1U << RCC_APB1LPENR_TIM13LPEN_BIT)
    #define RCC_APB1LPENR_TIM12LPEN         (1U << RCC_APB1LPENR_TIM12LPEN_BIT)
    #define RCC_APB1LPENR_TIM7LPEN          (1U << RCC_APB1LPENR_TIM7LPEN_BIT)
    #define RCC_APB1LPENR_TIM6LPEN          (1U << RCC_APB1LPENR_TIM6LPEN_BIT)
    #define RCC_APB1LPENR_TIM5LPEN          (1U << RCC_APB1LPENR_TIM5LPEN_BIT)
    #define RCC_APB1LPENR_TIM4LPEN          (1U << RCC_APB1LPENR_TIM4LPEN_BIT)
    #define RCC_APB1LPENR_TIM3LPEN          (1U << RCC_APB1LPENR_TIM3LPEN_BIT)
    #define RCC_APB1LPENR_TIM2LPEN          (1U << RCC_APB1LPENR_TIM2LPEN_BIT)

    /* APB2 */

    #define RCC_APB2LPENR_TIM11LPEN_BIT     18
    #define RCC_APB2LPENR_TIM10LPEN_BIT     17
    #define RCC_APB2LPENR_TIM9LPEN_BIT      16
    #define RCC_APB2LPENR_SYSCFGLPEN_BIT    14
    #define RCC_APB2LPENR_SPI1LPEN_BIT      12
    #define RCC_APB2LPENR_SDIOLPEN_BIT      11
    #define RCC_APB2LPENR_ADC3LPEN_BIT      10
    #define RCC_APB2LPENR_ADC2LPEN_BIT      9
    #define RCC_APB2LPENR_ADC1LPEN_BIT      8
    #define RCC_APB2LPENR_USART6LPEN_BIT    5
    #define RCC_APB2LPENR_USART1LPEN_BIT    4
    #define RCC_APB2LPENR_TIM8LPEN_BIT      1
    #define RCC_APB2LPENR_TIM1LPEN_BIT      0

    #define RCC_APB2LPENR_TIM11LPEN         (1U << RCC_APB2LPENR_TIM11LPEN_BIT)
    #define RCC_APB2LPENR_TIM10LPEN         (1U << RCC_APB2LPENR_TIM10LPEN_BIT)
    #define RCC_APB2LPENR_TIM9LPEN          (1U << RCC_APB2LPENR_TIM9LPEN_BIT)
    #define RCC_APB2LPENR_SYSCFGLPEN        (1U << RCC_APB2LPENR_SYSCFGLPEN_BIT)
    #define RCC_APB2LPENR_SPI1LPEN          (1U << RCC_APB2LPENR_SPI1LPEN_BIT)
    #define RCC_APB2LPENR_SDIOLPEN          (1U << RCC_APB2LPENR_SDIOLPEN_BIT)
    #define RCC_APB2LPENR_ADC3LPEN          (1U << RCC_APB2LPENR_ADC3LPEN_BIT)
    #define RCC_APB2LPENR_ADC2LPEN          (1U << RCC_APB2LPENR_ADC2LPEN_BIT)
    #define RCC_APB2LPENR_ADC1LPEN          (1U << RCC_APB2LPENR_ADC1LPEN_BIT)
    #define RCC_APB2LPENR_USART6LPEN        (1U << RCC_APB2LPENR_USART6LPEN_BIT)
    #define RCC_APB2LPENR_USART1LPEN        (1U << RCC_APB2LPENR_USART1LPEN_BIT)
    #define RCC_APB2LPENR_TIM8LPEN          (1U << RCC_APB2LPENR_TIM8LPEN_BIT)
    #define RCC_APB2LPENR_TIM1LPEN          (1U << RCC_APB2LPENR_TIM1LPEN_BIT)

Backup domain control register
++++++++++++++++++++++++++++++

::

    #define RCC_BDCR_BDRST_BIT              16
    #define RCC_BDCR_RTCEN_BIT              15
    #define RCC_BDCR_LSEBYP_BIT             2
    #define RCC_BDCR_LSERDY_BIT             1
    #define RCC_BDCR_LSEON_BIT              0

    #define RCC_BDCR_BDRST                  (1U << RCC_BDCR_BDRST_BIT)
    #define RCC_BDCR_RTCEN                  (1U << RCC_BDCR_RTCEN_BIT)
    #define RCC_BDCR_RTCSEL                 (0x3 << 8)
    #define RCC_BDCR_RTCSEL_NOCLOCK         (0x0 << 8)
    #define RCC_BDCR_RTCSEL_LSE             (0x1 << 8)
    #define RCC_BDCR_RTCSEL_LSI             (0x2 << 8)
    #define RCC_BDCR_RTCSEL_HSE_DIV         (0x3 << 8)
    #define RCC_BDCR_LSEBYP                 (1U << RCC_BDCR_LSEBYP_BIT)
    #define RCC_BDCR_LSERDY                 (1U << RCC_BDCR_LSERDY_BIT)
    #define RCC_BDCR_LSEON                  (1U << RCC_BDCR_LSEON_BIT)

Clock control and status register
+++++++++++++++++++++++++++++++++

::

    #define RCC_CSR_LPWRRSTF_BIT            31
    #define RCC_CSR_WWDGRSTF_BIT            30
    #define RCC_CSR_IWDGRSTF_BIT            29
    #define RCC_CSR_SFTRSTF_BIT             28
    #define RCC_CSR_PORRSTF_BIT             27
    #define RCC_CSR_PINRSTF_BIT             26
    #define RCC_CSR_BORRSTF_BIT             25
    #define RCC_CSR_RMVF_BIT                24
    #define RCC_CSR_LSIRDY_BIT              1
    #define RCC_CSR_LSION_BIT               0

    #define RCC_CSR_LPWRRSTF                (1U << RCC_CSR_LPWRRSTF_BIT)
    #define RCC_CSR_WWDGRSTF                (1U << RCC_CSR_WWDGRSTF_BIT)
    #define RCC_CSR_IWDGRSTF                (1U << RCC_CSR_IWDGRSTF_BIT)
    #define RCC_CSR_SFTRSTF                 (1U << RCC_CSR_SFTRSTF_BIT)
    #define RCC_CSR_PORRSTF                 (1U << RCC_CSR_PORRSTF_BIT)
    #define RCC_CSR_PINRSTF                 (1U << RCC_CSR_PINRSTF_BIT)
    #define RCC_CSR_BORRSTF                 (1U << RCC_CSR_BORRSTF_BIT)
    #define RCC_CSR_RMVF                    (1U << RCC_CSR_RMVF_BIT)
    #define RCC_CSR_LSIRDY                  (1U << RCC_CSR_LSIRDY_BIT)
    #define RCC_CSR_LSION                   (1U << RCC_CSR_LSION_BIT)

Spread spectrum clock generation register
+++++++++++++++++++++++++++++++++++++++++

::

    #define RCC_SSCGR_SSCGEN_BIT            31
    #define RCC_SSCGR_SPREADSEL_BIT         30

    #define RCC_SSCGR_SSCGEN                (1U << RCC_SSCGR_SSCGEN_BIT)
    #define RCC_SSCGR_SPREADSEL             (1U << RCC_SSCGR_SPREADSEL_BIT)
    #define RCC_SSCGR_SPREADSEL_CENTER      (0x0 << RCC_SSCGR_SPREADSEL_BIT)
    #define RCC_SSCGR_SPREADSEL_DOWN        (0x1 << RCC_SSCGR_SPREADSEL_BIT)
    #define RCC_SSCGR_INCSTEP               (0xFFF << 16)
    #define RCC_SSCGR_MODPER                0xFFFF

PLLI2S configuration register
+++++++++++++++++++++++++++++

::

    #define RCC_PLLI2SCFGR_PLLI2SR          (0x7 << 28)
    #define RCC_PLLI2SCFGR_PLLI2SN          (0x1FF << 6)