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ST STM32F31xx User Manual

ST STM32F31xx
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UM1581
Reset and clock control (RCC)
DocID023800 Rev 1
313/584
18.2 RCC Firmware driver API description
The following section lists the various functions of the RCC library.
18.2.1 RCC specific features
After reset the device is running from HSI (8 MHz) with Flash 0 WS, all peripherals are off
except internal SRAM, Flash and SWD.
ï‚· There is no prescaler on High speed (AHB) and Low speed (APB) busses; all
peripherals mapped on these busses are running at HSI speed.
ï‚· The clock for all peripherals is switched off, except the SRAM and FLASH.
ï‚· All GPIOs are in input floating state, except the SWD pins which are assigned to be
used for debug purpose.
Once the device starts from reset, the user application has to:
ï‚· Configure the clock source to be used to drive the System clock (if the application
needs higher frequency/performance).
ï‚· Configure the System clock frequency and Flash settings.
ï‚· Configure the AHB and APB busses prescalers.
ï‚· Enable the clock for the peripheral(s) to be used.
ï‚· Configure the clock source(s) for peripherals which clocks are not derived from the
System clock (ADC, TIM, I2C, USART, RTC and IWDG).
18.2.2 Internal-external clocks, PLL, CSS and MCO configuration functions
This section provides functions allowing to configure the internal/external clocks, PLL, CSS
and MCO.
1. HSI (high-speed internal), 8 MHz factory-trimmed RC used directly or through the PLL
as System clock source. The HSI clock can be used also to clock the USART and I2C
peripherals.
2. LSI (low-speed internal), 40 KHz low consumption RC used as IWDG and/or RTC
clock source.
3. HSE (high-speed external), 4 to 32 MHz crystal oscillator used directly or through the
PLL as System clock source. Can be used also as RTC clock source.
4. LSE (low-speed external), 32 KHz oscillator used as RTC clock source. LSE can be
used also to clock the USART peripherals.
5. PLL (clocked by HSI or HSE), for System clock.
6. CSS (Clock security system), once enabled and if a HSE clock failure occurs (HSE
used directly or through PLL as System clock source), the System clock is
automatically switched to HSI and an interrupt is generated if enabled. The interrupt is
linked to the Cortex-M4 NMI (Non-Maskable Interrupt) exception vector.
7. MCO (microcontroller clock output), used to output SYSCLK, HSI, HSE, LSI, LSE,
PLL clock on PA8 pin.
ï‚· RCC_DeInit()
ï‚· RCC_HSEConfig()
ï‚· RCC_WaitForHSEStartUp()
ï‚· RCC_AdjustHSICalibrationValue()
ï‚· RCC_HSICmd()
ï‚· RCC_LSEConfig()
ï‚· RCC_LSEDriveConfig()
ï‚· RCC_LSICmd()

Table of Contents

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ST STM32F31xx Specifications

General IconGeneral
BrandST
ModelSTM32F31xx
CategoryMicrocontrollers
LanguageEnglish

Summary

How to Use and Customize the Library

Library Configuration Parameters

Details configuration parameters that customize the library for specific applications via define statements.

Peripheral Initialization and Configuration

Step-by-step guide on how to initialize and configure a peripheral, including clock enabling.

Running Your First Example

Guides on loading and executing template examples, covering prerequisites and tool-specific steps.

Developing Your First Application

Outlines the typical starting point and steps for developing an application from scratch.

Analog-to-digital converter (ADC) Firmware Driver

ADC Firmware Driver API Description

Lists and describes the various functions available in the ADC library for peripheral control.

Controller Area Network (bxCAN) Firmware Driver

CAN Firmware Driver API Description

Lists and describes the various functions available in the CAN library for peripheral control.

Comparators (COMP) Firmware Driver

COMP Firmware Driver API Description

Lists and describes the various functions available in the COMP library for peripheral control.

CRC Calculation Unit (CRC) Firmware Driver

CRC Firmware Driver API Description

Lists and describes the various functions for CRC configuration and computation.

Digital-to-Analog Converter (DAC) Firmware Driver

DAC Firmware Driver API Description

Lists and describes the various functions for DAC peripheral control and data transfer.

DMA Controller (DMA) Firmware Driver

DMA Firmware Driver API Description

Lists and describes functions for DMA initialization, configuration, and data transfers.

External Interrupt/Event Controller (EXTI) Firmware Driver

EXTI Firmware Driver API Description

Lists and describes functions for EXTI features, usage, initialization, and interrupt management.

FLASH Memory (FLASH) Firmware Driver

FLASH Firmware Driver API Description

Lists and describes functions for FLASH interface configuration and memory programming.

General-purpose I/Os (GPIO) Firmware Driver

GPIO Firmware Driver API Description

Lists and describes functions for GPIO usage, initialization, read/write, and alternate functions.

Inter-integrated Circuit Interface (I2C) Firmware Driver

I2C Firmware Driver API Description

Lists and describes functions for I2C usage, initialization, communication, SMBUS, and registers management.

Independent Watchdog (IWDG) Firmware Driver

IWDG Firmware Driver API Description

Lists and describes functions for IWDG features, usage, prescaler, activation, and flag management.

Operational Amplifier (OPAMP) Firmware Driver

OPAMP Firmware Driver API Description

Lists and describes functions for OPAMP peripheral features, usage, and initialization.

Power Control (PWR) Firmware Driver

PWR Firmware Driver API Description

Lists and describes functions for backup domain access, PVD configuration, and low power modes.

Reset and Clock Control (RCC) Firmware Driver

RCC Firmware Driver API Description

Lists and describes functions for RCC features, clock configuration, and peripheral clocks.

Real-time Clock (RTC) Firmware Driver

RTC Firmware Driver API Description

Lists and describes functions for RTC operating conditions, domain access, and time/date configuration.

Serial Peripheral Interface (SPI) Firmware Driver

SPI Firmware Driver API Description

Lists and describes functions for SPI usage, initialization, data transfers, CRC calculation, and DMA.

System Configuration Controller (SYSCFG) Firmware Driver

SYSCFG Firmware Driver API Description

Lists and describes functions for SYSCFG usage, initialization, and configuration.

General-Purpose Timers (TIM) Firmware Driver

TIM Firmware Driver API Description

Lists and describes functions for TIM output compare, input capture, advanced control, and synchronization management.

Universal Synchronous Asynchronous Receiver Transmitter (USART) Firmware Driver

USART Firmware Driver API Description

Lists and describes functions for USART usage, initialization, RS485, DMA, interrupts, STOP mode, and AutoBaudRate.

Window Watchdog (WWDG) Firmware Driver

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