RM57L843: How to calibrate RTI interrupt cycle time

void rtiInit(void)
{
/* USER CODE BEGIN (2) */
/* USER CODE END */
    /** @b Initialize @b RTI1: */

    /** - Setup NTU source, debug options and disable both counter blocks */
    rtiREG1->GCTRL = (uint32)((uint32)0xAU << 16U) | 0x00000000U;

    /** - Setup timebase for free running counter 0 */
    rtiREG1->TBCTRL = 0x00000000U;

    /** - Enable/Disable capture event sources for both counter blocks */
    rtiREG1->CAPCTRL = 2U | 0U;

    /** - Setup input source compare 0-3 */
    rtiREG1->COMPCTRL = 0x00001000U | 0x00000100U | 0x00000000U | 0x00000000U;

    /** - Reset up counter 0 */
    rtiREG1->CNT[0U].UCx = 0x00000000U;

    /** - Reset free running counter 0 */
    rtiREG1->CNT[0U].FRCx = 0x00000000U;

    /** - Setup up counter 0 compare value 
    *     - 0x00000000: Divide by 2^32
    *     - 0x00000001-0xFFFFFFFF: Divide by (CPUC0 + 1)
    */
    rtiREG1->CNT[0U].CPUCx = 10U;

    /** - Reset up counter 1 */
    rtiREG1->CNT[1U].UCx = 0x00000000U;

    /** - Reset free running counter 1 */
    rtiREG1->CNT[1U].FRCx  = 0x00000000U;

    /** - Setup up counter 1 compare value 
    *     - 0x00000000: Divide by 2^32
    *     - 0x00000001-0xFFFFFFFF: Divide by (CPUC1 + 1)
    */
    rtiREG1->CNT[1U].CPUCx = 10U;

    /** - Setup compare 0 value. This value is compared with selected free running counter. */
    rtiREG1->CMP[0U].COMPx = 1000U;

    /** - Setup update compare 0 value. This value is added to the compare 0 value on each compare match. */
    rtiREG1->CMP[0U].UDCPx = 1000U;

    /** - Setup compare 1 value. This value is compared with selected free running counter. */
    rtiREG1->CMP[1U].COMPx = 10000U;

    /** - Setup update compare 1 value. This value is added to the compare 1 value on each compare match. */
    rtiREG1->CMP[1U].UDCPx = 10000U;

    /** - Setup compare 2 value. This value is compared with selected free running counter. */
    rtiREG1->CMP[2U].COMPx = 100000U;

    /** - Setup update compare 2 value. This value is added to the compare 2 value on each compare match. */
    rtiREG1->CMP[2U].UDCPx = 100000U;

    /** - Setup compare 3 value. This value is compared with selected free running counter. */
    rtiREG1->CMP[3U].COMPx = 1000000U;

    /** - Setup update compare 3 value. This value is added to the compare 3 value on each compare match. */
    rtiREG1->CMP[3U].UDCPx = 1000000U;

    /** - Clear all pending interrupts */
    rtiREG1->INTFLAG = 0x0007000FU;

    /** - Disable all interrupts */
    rtiREG1->CLEARINTENA = 0x00070F0FU;

    /**   @note This function has to be called before the driver can be used.\n
    *           This function has to be executed in privileged mode.\n
    *           This function does not start the counters.
    */

/* USER CODE BEGIN (3) */
#if REGISTER_WRITTEN_READBACK
    (void)CheckDataReadback(&(rtiREG1->GCTRL), 1u);
#endif /* REGISTER_WRITTEN_READBACK */

/* USER CODE END */
}