[ECOS] Re: Time problem: Clock running slow

Grant Edwards grant.b.edwards@gmail.com
Thu Sep 2 12:52:00 GMT 2010


On 2010-09-02, Iris Lindner <ilindner@logopak.de> wrote:
> Hi everyone,
> we just encountered a problem with our clock: It is running slow with 
> approximately 24 seconds per hour.
[...]
> The real-time clock constants are: numerator=1 000 000 000,
> denominator=1000, period=66500 (so 1 tick = 1 ms). (And I've verified
> the chip's I/O bus speed as well as the basic core speed.)

When you say "verified" do you mean with a recently calibrated
frequency counter?  Your error is only 100ppm (0.01%).

> Could there be a problem with these constants? Or perhaps interrupts 
> disturbing the clock interrupt? Thanks in advance for any help / idea
> / comment!! cu Iris




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