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'[PIC]: Tost when using intosc on 12F629 ?'
2003\02\13@070902 by

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Hi.
I'v read the data sheet for the 12F629/675.
Is states a 1000 Tosc startup time after a wakeup from sleep. But it also (in a note to fig 9-17)
states a *1us* startup time *if* using RC-osc.

Now, what is the startup time if using int osc mode ?
Does that count as a special case of RC osc mode ?

Jan-Erik Söderholm

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2003\02\14@030618 by

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face
Well, it's been quiet on this issue.
I think I'll just setup a test circuit
and try to messure the wakeup time when
running with intosc...

Jan-Erik.


{Original Message removed}

2003\02\14@080446 by Olin Lathrop

face picon face
> Well, it's been quiet on this issue.

I remember starting to reply to your original post but skipped it and went
on to the next when I saw you used quoted printable encoding.


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2003\02\14@100155 by

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Hi.
I *think* this mail is text/plain now.

What was it you was going to writing regaring
wakeup time and intosc ?

Jan-Erik.

PS.
I had my mail client set to "plain text", but now also
changed the "encoding" from "Western European (ISO)"
to "US ASCII". Hope it helps and it might be a good tip
to someone else (well, *if* it helped)...

And, have anyone else noticed that any mail beginning with "OK"
on the first line are rejected by the list server ?
DS.


Olin Lathrop :

>> Well, it's been quiet on this issue.
>
>I remember starting to reply to your original post but skipped it and went
>on to the next when I saw you used quoted printable encoding.

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2003\02\14@105700 by Olin Lathrop

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> I *think* this mail is text/plain now.

Yes, it is.

> What was it you was going to writing regaring
> wakeup time and intosc ?

I don't remember the original question, but I think there was some
question about when the osciallator startup timer would be applied.  As
far as I know, the oscillator startup timer only applies to the crystal
oscillator modes, because a crystal has a high Q and may take some cycles
to stabalize into repeatable operation.  The PIC lets the crystal
oscillator run for 1024 cycles (if I remember right) before letting the
PIC run.  RC oscillators don't work like this, and should be repeatable
after the first cycle.  For this reason, the oscillator startup timer is
not applied in external RC mode.  I don't think it's applied to internal
RC mode for the same reason.  Therefore, a PIC set to internal RC
oscillator mode will wake up immediately from sleep on an appropriate
wakeup event, whereas there is some delay if using a crystal.

> I had my mail client set to "plain text", but now also
> changed the "encoding" from "Western European (ISO)"
> to "US ASCII". Hope it helps and it might be a good tip
> to someone else (well, *if* it helped)...

That makes sense.  SMTP email transport was designed in the early 1980s to
carry 7 bit ASCII characters, which were in turn designed much earlier to
transport US English.  This was back before all those places that didn't
develop the computer industry started whining about wanting all their
silly little characters included for their silly little legacy languages.
Since the first whiners with any economic clout worth paying attention to
were europeans, the ISO-Latin standard extended the 7 bit ASCII code to
include the aforementioned characters in the unused byte codes 128 - 255.
You could now transmit umlauts, funny looking Os with slashes thru them,
various squiggles, tick marks, and a bunch of other strange symbols never
intended for polite conversation.  A surprisingly large percentage of the
new codes were used for characters unique to an insignificantly small
group of ex-vikings that took a wrong turn a thousand years ago after a
particularly rough night of raping, pillaging, and drinking, and woke up
the next morning sitting on an ice covered volcano in the middle of the
north Atlantic.  Having nothing better to do, they spent the time
inbreeding and inventing ever more obscure symbols for their language.

... ducking behind flame retardent barrier <g> ...

This is why selecting "Western European" causes 8 bit codes to be emitted,
which forces some form of encoding for transport over 7 bit bytes.  Quoted
printable is the most logical choice because it only adds extra
gobbledygook when using one of the aformentioned silly characters.  Anyone
using standard US English doesn't have a problem and can send 7 bit ASCII
characters directly.

16 bit unicode was invented when the rest of the world starting whining
too.  I guess it's real important that a herdsman in Outer Mongolia be
able to count yaks on his computer - should he ever get a computer or a
place to plug it in.

> And, have anyone else noticed that any mail beginning with "OK"
> on the first line are rejected by the list server ?

No, but I'm going to test that right now.


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2003\02\14@111841 by erholm (QAC)

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Well, I'v no problem adopting (when needed) to those
still living in the dark middle ages of computing...

:-)

Jan-Erik Soderholm.

PS.
Oh, I forgot, thanks for your writeup on wakeup timing !
It's in line with what I hoped/thought.
DS.


Olin Lathrop wrote :

[Well, never mind, no reason to start a flame ware with Olin
ducking behind his flame retardent barrier anyway...]

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