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'Rejected posting to PICLIST@MITVMA.MIT.EDU'
1999\04\26@185446 by Scott Fink

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    Since this email was forwarded to me I do not know the original
    subject line, so I had to make one up, hopefully those interested in
    this thread picked up on it.

    This is in regards to Mark E'silva's message regarding the 12C509 vs
    12C509A oscillator calibration, and his complaint that code written
    for the 12C509 runs "a LOT slower" on the 12C509A.

    This is a basic misunderstanding of the purpose of the OSCCAL register
    and calibration of the internal RC oscillator and of RC oscillators in
    general.  The purpose of the OSCCAL register is to allow the user to
    move the value placed into the W register on reset by the MOVLW XX
    command placed at the reset vector (3FFh in the 12C509) by the
    factory.  This is to reduce the effects of the silicon process
    variation on the final frequency of the internal oscillator, and to
    allow Microchip to provide a tighter specification for the oscillator
    and still maintain a reasonable yield (and thus provide a reasonable
    cost to you, the customer).

    It is NOT recommended that the customer place any value other that the
    factory programmed oscillator calibration value into the OSCCAL
    register.  The reason for this is that if the customer designs his
    code to adjust the OSCCAL value up or down from that factory
    calibration value, there may not be any adjustment range left.  For
    example if the customer is trying to adjust the value two counts
    faster, what if the factory had to program the cal value to FFh (there
    would be no adjustment range left)?  If this is a high volume
    application, the customer could receive parts that he cannot use for
    many, many months until the process shifted back to a faster value.
    For this reason we recommend that customers use the factory programmed
    value and do any timing adjustments in software.

    Mr. E'silva doesn't say what voltage and temperature he is running at,
    so I will assume 25C and Vdd = 5.0V.  If I further assume that the
    12C509 is actually running at 4MHz and yields a 3.937KHz tone when set
    at mid range, the 12C509A must be running at 3.89MHz, well within the
    range of approx 3.71 to 4.22MHz shown in figure 14-1 of the data sheet
    (DS40139E), and really really within the spec given in table 13-3 of
    3.65 to 4.28MHz over temperature (but still at 5V).

    Remember that this is a resistor-capacitor (RC) oscillator and so
    cannot be expected to have a tolerance anything like a crystal or even
    a resonator.  If tight tolerances are needed over temperature and Vdd,
    you should use a crystal or resonator.


    I have been out of the office for a while and have not been watching
    the list, but I will get back on and see if there are any further
    questions about this, or you can directly email me.

    Best Regards,
    Scott Fink


'Rejected posting to PICLIST@MITVMA.MIT.EDU'
2002\07\29@052743 by EDU (1.8d)
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You  are  not   authorized  to  send  mail  to  the   PICLIST  list  from  your
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X-Priority: 3
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Message-Id: <KILLspam0H6I6I8ILA5J.7OEGDHQBG13O7JG6VK71.picKILLspamspammitvma.mit.edu>> X-MSMail-Priority: Normal
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'Rejected posting to PICLIST@MITVMA.MIT.EDU'
2002\08\04@200840 by EDU (1.8d)
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You  are  not   authorized  to  send  mail  to  the   PICLIST  list  from  your
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another of  your accounts,  or perhaps  when using  another mail  program which
generates slightly  different addresses, but  LISTSERV has no way  to associate
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any question regarding the policy of  the PICLIST list, please contact the list
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Message-Id: <EraseME79AA9M7YT.I51R9U17LQ6U01.picspamspamspamBeGonemitvma.mit.edu>> Subject: Refinance and Save $$$
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding:  Quoted-Printable

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at a lower interest rate and payment, we can help!

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Refinance your home with us and include all of those pesky credit card bills =
or
use the extra cash for that pool you've always wanted...

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Even if you have been turned down elsewhere, we can help!

Easy terms! Our mortgage referral service combines the
highest quality loans with most economical rates and the easiest =
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RemoveMEpiclist-unsubscribe-requestKILLspamspammitvma.mit.edu



'Rejected posting to PICLIST@MITVMA.MIT.EDU'
2002\10\22@175155 by Olin Lathrop
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part 1 1448 bytes content-type:text/plain; (decoded 7bit)

I tried to reply before, but the list server bounced it back because the
message exceeded 1000 lines.  Here it is again with the PICPRG.INS.PAS
attachment omitted:

{Quote hidden}

algorithm
{Quote hidden}


part 2 9795 bytes content-type:application/octet-stream; (decode)

part 3 310 bytes

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