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PICList Thread
'PICLIST Digest - 1 Dec 1998 to 2 Dec 1998'
1998\12\03@084838 by miked

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> Whats the fix to make the picstart+ work reliably on windows 95 (i already
> turned off the FIFO) on the port. It seems that the comms is too fast or
> somthing as it works ok intermittantly mplab is 3.4 and firmware in picstart
> is v1.2
>
> Any tips will save loads of stress turning to violance.......
>
> Cheers Steve.......
>
I think firmware 1.50 fixed up some COMMs problems.

1998\12\03@085255 by miked

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> Dear colleagues,
>
>         It's the first time that I program a PIC microcontroller and I'm
> experiencing a little problem. I'm working with a UV erasable PIC12C508
> and so far I erased the device correctly. The calibration value for the
> internal oscillator was obviously erased, but I don't know how to
> reprogram this value. I have a document (DS40139D) downloaded from the
> Microchip Web Page and it says that "the calibration value must be read
> prior to erasing the part, so it can be reprogrammed correctly later". I
> read the value that was pre-programmed, but there isn't any kind of
> information about reprogramming this calibration value.
>         Could someone help me with this problem? It's fundamental to me this
> calibration value because I'm using the internal oscillator.
>         Regards,
>
You need at the end of your code
ORG     1FFH            ;assuming '508
       movlw   xx      ;where xx is the CAL value you wrote down
For OTP parts the above has already been done by MChip.

1998\12\03@124214 by Peter L. Peres

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On Thu, 3 Dec 1998, Mike DeMetz wrote:

> You need at the end of your code
> ORG     1FFH            ;assuming '508
>         movlw   xx      ;where xx is the CAL value you wrote down
> For OTP parts the above has already been done by MChip.

Since we're at it, could you (all) please post typical calibartion values
to the list. I'll post mine, from a set of 508's and 509's too as soon as
I finish what I'm doing now (with other processors - and in other
domains).

imho this would give a good starting value in case of oops. Is 0x80 a good
start ?

tia,

Peter

1998\12\03@224010 by Eduardo R.

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>
>Since we're at it, could you (all) please post typical calibartion values
>to the list. I'll post mine, from a set of 508's and 509's too as soon as
>I finish what I'm doing now (with other processors - and in other
>domains).
>
>imho this would give a good starting value in case of oops. Is 0x80 a good
>start ?
>

I have : 508 = 0xE0
         509 = 0xF0

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