From: "petrus bitbyter"
References: <email@example.com> <5tAn9.firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
Subject: Re: 8051 clock
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Date: Tue, 08 Oct 2002 18:12:42 GMT
NNTP-Posting-Date: Tue, 08 Oct 2002 20:12:42 MET DST
Organization: chello broadband
"Keith R. Williams" schreef in bericht
> In article ,
> email@example.com says...
> > > >Steve,
> > > >
> > > >Read again, preferable the whole discussion and don't yell to me. If
> > > >still don't understand, come again. FYI, I build both 8751- and 8031
> > boards
> > > >using the original data books from Intel and Philips.
> > > >
> > > >pieter.
> > > -----------------
> > > I've built those up for YEARS with the SAME clock, or swapped any of
> > > type for any other with total impunity. What are YOU doing wrong?
> > > -Steve
> > > --
> > > -Steve Walz firstname.lastname@example.org
> > > Electronics Site!! 1000's of Files and Dirs!! With Schematics
> > > http://www.armory.com/~rstevew or
> > >
> > Steve,
> > Well, I don't. But even if I do there's no reason to yell about it. FYI,
> > repeat the original question below:
> > > Hello,
> > >
> > > Well i have problem with 8051 clock,
> > > i had connected the 2 small capacitors ~15nP but still no clock,
> > > BUT , when i'm taking the 8051 out from the circuit and connecting
> > > those caps with the vcc,GND i can see the clock as it should be.
> > >
> > > my circuit is simple 8051,74373 and eeprom(at28c64), how can the
> > > circuit cause me to loose the clock..?? (i check all the connections
> > > the relevan to the clock)..
> > >
> > > Please your advice,
> > > Eitan Herman.
> > Having so much experience, you will admit that you may run into
> > unpredictable problems using a 8051 in a board that has not been
> > for it, *unless* you pull the /EA pin, to inhibit the internal ROM
> > the 8051 behave like a 8031 as Spehro Pefhany added.
> > So there never has been a point about the absence of a clock circuit in
> > 8051-family processor until *you* thought it was.
> Actually, no. You wrote:
> > Do you really have a 8051 or is it a 8031? A 8051 is a mask
> > rom version and can only be used in a circuit that has been
> > developed for it. Putting it in another circuit will give
> > unpredictable results, including clock failure.
> This is quite false and RSW called you on it.
> Even though RSW is an ass, he's right here.
Well, as we agree on the technical part, there's only a matter of language
left. I checked my dictionary for it but at the word "failure" I did not
found the notion of "missing something" like I found at "to fail". Amongst
others I found "stop working", "not funtioning correctly", like "heart
failure" or "system failure". So I only meant to say that a clockcircuit,
functioning correctly with only two capacitors and an X-tal, may stop
working when you put it in a wrong board. I obviously did not mean that it
would disappear. Nevertheless I might be wrong. So be it. After all I'm an
engineer not a linguist.