Subject: Re: Counter Skipping.....
Organization: Nobody nowhere
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
Date: Sat, 11 Jan 2003 00:17:43 -0000
NNTP-Posting-Date: Sat, 11 Jan 2003 00:17:48 GMT
"John Fields" wrote in message
> On Fri, 10 Jan 2003 16:45:49 -0700, William
> >Hello Everyone,
> >The counter has 2 Eproms for which it has digits for 10's and 1's
> >(0~99) It counts backwards, but the results are not linear. Every so
> >often it Will skip like 51,50, 39, 38 etc. The enable for the first
> >(tens) Eprom goes high for only 5 microseconds. I selected a CR time
> >constant of 1us which consists of 100pf cap and 10k resistor, so that
> >the Eprom will subtract 1 instead of 2. It's tied to the enable line
> >in parallel and one side to ground. I tried setting the enable line
> >high for only 2us in software, but the the tens counter doesn't
> >subtract at all.
> >Questions: The CR time constant, should it have a longer or shorter
> >fall time for this counter? Should the CR time be longer or shorter
> >than what I selected?
> >Any help would be great
> Well, you've got _me_ confused! I have no idea what you're using
> for a counter, why the EPROM enable times matter or, as a matter of
> fact, what on earth you're talking about. How about an explanation
> of what your application is and a schematic? You'll need to post it
> to a web page somewhere or to alt.binaries.schematics.electronic
> since this a text-only newsgroup and a lot of servers will probably
> reject it if you try to post it here.
It got me confused to. What are the EPROMs for, dot-matrix character