How about using a simple single transistor crystal oscillator circuit,
with the output going to osc in.
If the chip fuses are set to rc,
this will give you 1/4 clock out on osc out

Anne Ogborn wrote:
>
> I'm using a xtal for my project, as I need an accurate
> timebase, and I have to be cheap (production device).
> So no can oscillator.
>
> I'm wanting a stable 1MHtz source to drive the ISD chip as well,
> one locked to the CPU clock.
>
> The obvious thing to do is to tap into the xtal output.
> So, can somebody tell me what sort of electronic wizardry I have
> to do to make the 4MHtz crystal drive some sort of gate so I can
> divide by 4 and drive the ISD chip???