ST STM32F31xx

Reset and clock control (RCC)
UM1581
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DocID023800 Rev 1
18.2.5 Interrupts and flags management functions
 RCC_ITConfig()
 RCC_GetFlagStatus()
 RCC_ClearFlag()
 RCC_GetITStatus()
 RCC_ClearITPendingBit()
18.2.6 Internal and external clocks, PLL, CSS and MCO configuration
functions
18.2.6.1 RCC_DeInit
Function Name
void RCC_DeInit ( void )
Function Description
Resets the RCC clock configuration to the default reset state.
Parameters
 None.
Return values
 None.
Notes
 The default reset state of the clock configuration is given
below:
 HSI ON and used as system clock source
 HSE and PLL OFF
 AHB, APB1 and APB2 prescalers set to 1.
 CSS and MCO OFF
 All interrupts disabled
 However, this function doesn't modify the configuration of the
 Peripheral clocks
 LSI, LSE and RTC clocks
18.2.6.2 RCC_HSEConfig
Function Name
void RCC_HSEConfig ( uint8_t RCC_HSE)
Function Description
Configures the External High Speed oscillator (HSE).
Parameters
 RCC_HSE : specifies the new state of the HSE. This
parameter can be one of the following values:
 RCC_HSE_OFF : turn OFF the HSE oscillator,
HSERDY flag goes low after 6 HSE oscillator clock
cycles.
 RCC_HSE_ON : turn ON the HSE oscillator
 RCC_HSE_Bypass : HSE oscillator bypassed with
external clock