Meat Plow wrote:

Size?
Temp?

Does a tiny watch xtal garner any more accuracy merely because of its
size?

Does a watch xtal have a different temperature coefficient?

You are confusing the hardware clock and software clock in a computer.

The hardware clock is crystal controlled. It is used at boot time to set
the software clock.

The software clock is incremented by the lowest priority interupts, which
causes it to wander off.

There are various schemes to sync it with the hardware clock, but without
an external source, e.g. NTP, the don't work very well as hardware clocks
are not very accurate.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM