stm32f4xx_rcc.c File Reference

This file provides firmware functions to manage the following functionalities of the Reset and clock control (RCC) peripheral:

• Internal/external clocks, PLL, CSS and MCO configuration
• System, AHB and APB busses clocks configuration
• Peripheral clocks configuration
• Interrupts and flags management.

Go to the source code of this file.

Detailed Description

This file provides firmware functions to manage the following functionalities of the Reset and clock control (RCC) peripheral:

• Internal/external clocks, PLL, CSS and MCO configuration
• System, AHB and APB busses clocks configuration
• Peripheral clocks configuration
• Interrupts and flags management.

Author:

MCD Application Team

Version:

V1.0.0

Date:

30-September-2011

  *               
  *          ===================================================================
  *                               RCC specific features
  *          ===================================================================
  *    
  *          After reset the device is running from Internal High Speed oscillator 
  *          (HSI 16MHz) with Flash 0 wait state, Flash prefetch buffer, D-Cache 
  *          and I-Cache are disabled, and all peripherals are off except internal
  *          SRAM, Flash and JTAG.
  *           - There is no prescaler on High speed (AHB) and Low speed (APB) busses;
  *             all peripherals mapped on these busses are running at HSI speed.
  *       	  - The clock for all peripherals is switched off, except the SRAM and FLASH.
  *           - All GPIOs are in input floating state, except the JTAG pins which
  *             are assigned to be used for debug purpose.
  *        
  *          Once the device started from reset, the user application has to:        
  *           - Configure the clock source to be used to drive the System clock
  *             (if the application needs higher frequency/performance)
  *           - Configure the System clock frequency and Flash settings  
  *           - Configure the AHB and APB busses prescalers
  *           - Enable the clock for the peripheral(s) to be used
  *           - Configure the clock source(s) for peripherals which clocks are not
  *             derived from the System clock (I2S, RTC, ADC, USB OTG FS/SDIO/RNG)      
  *                        
  *  

Attention:

THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

© COPYRIGHT 2011 STMicroelectronics

Definition in file stm32f4xx_rcc.c.