ComputerVoltageSources

Hi Dave
thanks for the exploration
i took a look at processor pins 9&10 on my PSIM PCB and ... boy! you
ain't a-kiddin' about the 'not for the faint-of-heart'!
Like most human-sized, 70's wire-twisters, (with half-century old
eyesight and a propensity to sneeze SOIC components off the workbench)
 ...i'm not terribly comfortable tearing into surface-mount under good
conditions but this layout is tight as a... well...
(this is an all ages site so... let's just say it's TIGHT)
hmmmmmm, so far i looks to me like shopping list for external
processor clocking will include, at a minimum, expert SOIC component
removal skills/tools, flying wires off the BasicAtom and cancelling
the modularity that allows a BasicAtom swap.... 
  and that list excludes  the design of a module that caters to the
H8/3664's  clock requirements and ostensibly some arbitrary form of
compatibility with an external standard....

That shopping list will require a very motivated buyer
and...
it looks like it would  score just about the same pain in the ass
index as a workaround-software scheme , ie: trying to , as Senor
Brombaugh put it, implement some sort of  software PLL.

yuck...
even the 'elegant' solutions are inelegant
(and brute force will be expensive)

another point for Murphy's law!
-doc



--- In ComputerVoltageSources@yahoogroups.com, "djbrow54" <davebr@...>
wrote:
>
> Yes, it looks like you can drive it that way.  Taking the resonator 
> off will not be for the faint of heart.  Mine appears to be 3mm x 4mm 
> with full landing pads from edge to edge under the device.  There is 
> no way to remove it with a conventional soldering iron.  The center 
> pad is ground so you'd have to connect this to one of the inputs and 
> drive the other.  At least you have good sized pads for connecting a 
> wire ...
> 
> Dave
> 
> --- In ComputerVoltageSources@yahoogroups.com, "Samppa Tolvanen" 
> <samppa.tolvanen@> wrote:
> >
> > On 1/23/07, djbrow54 <davebr@> wrote:
> > >
> > 
> > > Actually, now that I look at my AtomPro28 photo in the photos 
> section,
> > >  I see they put a 1M resistor across the clock inputs.  You 
> probably
> > >  want to remove that also. - Dave
> > >
> > I hear, I hear. That´s for single AtomPro28 (24). But what I wanted
> > was to run 4 or something from the same clock. The chip supports it,
> > right?
> > 
> > One xtal leg grounded and the other driven by a logick
> >  pulse?
> > 
> > Samppa
> >
>