Functions

group group_sysclk_clk_fast_funcs

Functions

void Cy_SysClk_ClkFastSetDivider(uint8_t divider)

Sets the clock divider for the fast clock, which sources the main processor.

The source of this divider is clkHf[0].

note

Call SystemCoreClockUpdate after this function calling.

note

Call Cy_SysLib_SetWaitStates before calling this function if CLK_FAST frequency is increasing.

note

Call Cy_SysLib_SetWaitStates after calling this function if CLK_FAST frequency is decreasing.

Function Usage

    /* Scenario: HFCLK0 is configured and enabled. The Fast clock sourcing the
                 CM4 core must run at a frequency that is 1/16 of HFCLK0. */

    if(16u != Cy_SysClk_ClkFastGetDivider())
    {
        Cy_SysClk_ClkFastSetDivider(16u);
    }

    /* Get the CM4 clock source frequency */
    uint32_t clkFastfreq = Cy_SysClk_ClkFastGetFrequency();

Parameters

divider – divider value between 0 and 255. Causes integer division of (divider value + 1), or division by 1 to 256.

uint8_t Cy_SysClk_ClkFastGetDivider(void)

Returns the clock divider for the fast clock.

Function Usage

    /* Scenario: HFCLK0 is configured and enabled. The Fast clock sourcing the
                 CM4 core must run at a frequency that is 1/16 of HFCLK0. */

    if(16u != Cy_SysClk_ClkFastGetDivider())
    {
        Cy_SysClk_ClkFastSetDivider(16u);
    }

    /* Get the CM4 clock source frequency */
    uint32_t clkFastfreq = Cy_SysClk_ClkFastGetFrequency();

Returns

The divider value for the fast clock. The integer division done is by (divider value + 1), or division by 1 to 256.

uint32_t Cy_SysClk_ClkFastGetFrequency(void)

Reports the frequency of the fast clock.

Function Usage

    /* Scenario: HFCLK0 is configured and enabled. The Fast clock sourcing the
                 CM4 core must run at a frequency that is 1/16 of HFCLK0. */

    if(16u != Cy_SysClk_ClkFastGetDivider())
    {
        Cy_SysClk_ClkFastSetDivider(16u);
    }

    /* Get the CM4 clock source frequency */
    uint32_t clkFastfreq = Cy_SysClk_ClkFastGetFrequency();

Returns

The frequency, in Hz.