Re: 89C51ED2

Eeyore wrote:

Joerg wrote:

Jamie wrote:
Joerg wrote:
Jamie wrote:
Joerg wrote:
TT_Man wrote:

">> Is this an Atmel part?

If so, I would check the datasheets for updates.
I know on their 8252/3 series, they made a change to the crystal cap
requirements.
Went from 30pf to around 5pf. Would occasionally cause improper
startup/reset, and very slow operation if it did reset. If they
changed the oscillator on ED2, that could very well be the problem.
(?)

Hopefully not without changing the rev level and informing their
customers? Yikes, I sure hope not.

--
Regards, Joerg


Joerg, I get regular updates on all atmel processor revision
changes/data *** spec changes, . In this respect, Atmel are 100%
on the ball.
AFAIK there have been none for this particular part......


That's good. I'd call them anyhow though. I once had an issue with
them regarding an 89C51 that was advertized at a higher clock than
it could do. IIRC it was touted as 16MHz but I could only get it to
run at 12MHz. They did apologize and other than that it ran in that
same design forever. In fact, it's still in production, over a
decade now. That's the beauty of 8051 designs, those things are like
the VW Beetle.

Thats not true. My bosses VW bug finally *** the bed not to long
ago! :)

Yeah, but how old was it by then?

Ok, its a 1968 :)

Guess that last side collision he had didn't
do the under structure to good! :)
Well! 40 years is a respectable life for a car.

Hah ! If I'd kept to my plans to restore my first car, a Ford Cortina, that
might still be running age 40.


That was a good car. Drove one in Scotland. The battery was nearly dead but every morning it would start. On the lone road down from Durness one of the fuses fell out. After a half hour I found it in the dirt, whew ...

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
.

Quantcast