Ron Kneusel wrote :

> I've just started playing with microcontrollers and
> chose the 10F200 because of its extreme simplicity.

A bit "odd" beginners-PIC, maybe... :-)

> I decided to use 2 10F200s, each controlling 3 LEDs...
> 
> The program works and everything looks great until
> you let it run for awhile.  Then things start getting out
> of sync.

Of course they do. They are not "synced" are they ?

> I am using  the osccal value for each device.  While
> I didn't expect perfect synchronization I had hoped 
> it would last more than a few minutes.

You shold expect whatever the data sheet says,
noting else.

> 1. Why these get our of sync so quickly and how
> I might prevent that?

You can't. Not without connecting them in some way.
You could use one pin from one of them to "sync"
the other. Or simply use a 8 or 14 pin PIC...

Jan-Erik.



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