[sdiy] HMI-200 8051 ICE Ext. Clk

[Tony Kalomiris]

I have been studying the clock circuit of both the HMOS and CHMOS devices
and according using the Intel 8-Bit Embedded Controllers handbook (1990),
along with the App-155 "Oscillators for Microcontrollers".

The bit (no pun intended) I'm confused about is how that POD bypasses the
onboard crystal/resonator.
Does it just ground the input (Xtal2) and drive the output (Xtal1) for the
HMOS device. In other words leaves the reactive components sitting across
the output.

The internal processor of the emulator is an 80C154 a superset of the
8051/8031 etc.
Oh and the cabling is roughly 16" long, not much longer than the internal
wiring in the synth.
I will try this on breadboard circuit next. Wonder how other ICE's
documentation deal with this 'dangling' crystal on the target.

More experimenting and less typing is needed ;-)

On Wed, Oct 12, 2016 at 6:29 PM, Ullrich Peter <Peter.Ullrich at kapsch.net>
wrote:

> >Peter, that makes sense. I didn't scope the clock on the target to see if
> the long cabling (twisted pair) is upsetting >the clock. In the Jupiter-6
> case I always wondered about the two or more feet of unshielded wire
> clocking the >slave uC's. Which ICE are you using, I would like to look
> that up myself. So this clock then would need to >substituted for the
> targets external clock I imagine. This is an older unit with no local pod.
>
> I have several Ashling 8051 emulators and a simple PRICE-51.
> But I haven't used them for years...
>
> Ciao
> Peter
>
>
>
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