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
> >
>