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System clock runs slow


Hi all,
I'm running an LPC2212 board with eCos 2.
The board also has a dallas clock chip for wallclock.
SNTP is also configured and working.
What iI've observed is that the system clock looses about 3 seconds after 18 minutes when compared to both the wallclock and NTP.
I've checked the clock divisor settings and that's fine.
Interrupt nesting is enabled. It has a 10Mhz crystal and PLL takes that to 60Mhz.
I'm looking for ideas. How can I troubleshoot this? What could be the cause?

Thanks            ...Laurie:{)


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