General Description

Functions
void	Cy_SysClk_ExtClkSetFrequency (uint32_t freq)
	Sets the signal frequency of the External Clock Source (EXTCLK) into the internal storage to be used in Cy_SysClk_ClkHfGetFrequency. More...

uint32_t	Cy_SysClk_ExtClkGetFrequency (void)
	Returns the frequency of the External Clock Source (EXTCLK) from the internal storage. More...

Function Documentation

void Cy_SysClk_ExtClkSetFrequency ( uint32_t freq )

Sets the signal frequency of the External Clock Source (EXTCLK) into the internal storage to be used in Cy_SysClk_ClkHfGetFrequency.

Parameters

freq	The frequency of the External Clock Source.

Function Usage: /* Scenario: External precision 5MHz clock is needed to source clock path 1. */
/* Configure the pin P0_5 to be an external clock input */
(void)Cy_GPIO_Pin_FastInit(GPIO_PRT0, 5, CY_GPIO_DM_HIGHZ, 0x00u, P0_5_SRSS_EXT_CLK);
/* Set the EXTCLK frequency to 5MHz */
Cy_SysClk_ExtClkSetFrequency(5000000UL);
/* Set the EXTCLK as the source for clock path 1 */
(void)Cy_SysClk_ClkPathSetSource(1UL, CY_SYSCLK_CLKPATH_IN_EXT);
/* In case if there is a need to get the EXT CLK frequency */
uint32_t extClkFreq = Cy_SysClk_ExtClkGetFrequency();

uint32_t Cy_SysClk_ExtClkGetFrequency ( void )

Returns the frequency of the External Clock Source (EXTCLK) from the internal storage.

Function Usage: /* Scenario: External precision 5MHz clock is needed to source clock path 1. */
/* Configure the pin P0_5 to be an external clock input */
(void)Cy_GPIO_Pin_FastInit(GPIO_PRT0, 5, CY_GPIO_DM_HIGHZ, 0x00u, P0_5_SRSS_EXT_CLK);
/* Set the EXTCLK frequency to 5MHz */
Cy_SysClk_ExtClkSetFrequency(5000000UL);
/* Set the EXTCLK as the source for clock path 1 */
(void)Cy_SysClk_ClkPathSetSource(1UL, CY_SYSCLK_CLKPATH_IN_EXT);
/* In case if there is a need to get the EXT CLK frequency */
uint32_t extClkFreq = Cy_SysClk_ExtClkGetFrequency();