ST STM32F31xx

Reset and clock control (RCC)
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DocID023800 Rev 1
18.2.8.4 RCC_USARTCLKConfig
Function Name
void RCC_USARTCLKConfig ( uint32_t RCC_USARTCLK)
Function Description
Configures the USART clock (USARTCLK).
Parameters
 RCC_USARTCLK : defines the USART clock source. This
clock is derived from the HSI or System clock. This parameter
can be one of the following values:
 RCC_USARTxCLK_PCLK : USART clock = APB Clock
(PCLK)
 RCC_USARTxCLK_SYSCLK : USART clock = System
Clock
 RCC_USARTxCLK_LSE : USART clock = LSE Clock
 RCC_USARTxCLK_HSI : USART clock = HSI Clock (x
can be 1, 2, 3, 4 or 5).
Return values
 None.
Notes
 None.
18.2.8.5 RCC_USBCLKConfig
Function Name
void RCC_USBCLKConfig ( uint32_t RCC_USBCLKSource)
Function Description
Configures the USB clock (USBCLK).
Parameters
 RCC_USBCLKSource : specifies the USB clock source.
This clock is derived from the PLL output. This parameter can
be one of the following values:
 RCC_USBCLKSource_PLLCLK_1Div5 : PLL clock
divided by 1,5 selected as USB clock source
 RCC_USBCLKSource_PLLCLK_Div1 : PLL clock
selected as USB clock source
Return values
 None.
Notes
 None.