AVR-Chat

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>
>
> An external clock source should be good. There should be
> little or no interaction between the two clocked chips.


My only worry would be EMI.  Plan on a series resistor between the clock
source and each "client" of about 100-ish ohms, and a definite return path
in the ground. Dont' let the grounds of the processors and clock
source connect by a meandering path.  The difference in radiated EMI can be
enormous.


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