[ECOS] How to calculate the Real-time clock period?

[Chris C.]

Hi

In hal_arm_xxx.cdl, I don't know how to calculate the
CYGNUM_HAL_RTC_PERIOD. If the cpu clock speed is 24MHz, how to find it
value? Why at91 use ((CYGNUM_HAL_ARM_AT91_CLOCK_SPEED/32) /
CYGNUM_HAL_RTC_DENOMINATOR) to calculate the rtc period?

What is the function of CYGNUM_HAL_RTC_NUMERATOR and
CYGNUM_HAL_RTC_DENOMINATOR? 

Thanks! :D

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Chris

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