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'Newer parts - are they real?'
1997\12\05@100832 by Krishna Murphy

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Dear Picsters:

I'm looking for people who've actually used the 12C507/8. Has anyone got
any feedback as to the product release status, number of gotchas, or
inventory/price? I thought these were real, but I can't seem to find
them. Also, I'd like to know which development tools people really like
with these.

Thanks in advance for your support.

Regards, Kris


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1997\12\05@113539 by Mike Watson

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In message  <spam_OUT19971205150646.15213.qmailTakeThisOuTspamhotmail.com> .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
writes:
> Dear Picsters:
>
> I'm looking for people who've actually used the 12C507/8. Has anyone got
> any feedback as to the product release status, number of gotchas, or
> inventory/price? I thought these were real, but I can't seem to find
> them. Also, I'd like to know which development tools people really like
> with these.
>
Kris,

I have used the 12C508 and 509 in  a few different projects. I got a
couple of buggy engineering samples about this time last year, and
proper production pieces in Feb or March of this year.

The only gotcha that I know of is that the factory programmed osccal
value in the top of memory erases when you put the jw parts in the
earser, therefore you should read it and make a note of it before
the first erase.

I must say that I was impressed by these chips and that fact that
Microchip worked to get most of the pins as I/O pins. If they had
just slapped a 16C5x core in an 8 pin package, they wouldn't be
nearly as useable. 5/6 i/o pins in a 8 pin package is quite an
achievement.

I'm currently waiting for the 12C67x (??? 8 pin with adc) to be
released. I have a project or two lined up for them.

I use the PICStart+ for development. I have two PICs, when one is
erasing, I'm coding, burning and testing with the other. An EEProm
based device would make this a whole lot easier.


Regards,

Mike Watson

1997\12\05@124706 by Steve Lawther

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    Kris
   
    12C507? have I missed something?
   
    I've been using the 12C509 JW for prototyping and 12C508 for
    production - Not had any problems other than those of my own making!
   
    Remember that with the internal RC, the clock variation over temp and
    volts is large, so even with the oscillator calibration word, by -30C
    (no volt change) you can be a good few percent out from 4MHz. The
    internal clock is great for reducing RF emissions.
   
    Remember also, if you want GP2 as an O/P, setup OPTION so it isn't the
    timer I/P as well as setting TRIS.
   
    That's the only two things I've had to learn the hard way (ie why's it
    not working??)
   
       Steve Lawther
   
    Web page:-
   
    http://ourworld.compuserve.com/homepages/steve_lawther/


______________________________ Reply Separator _________________________________
Subject:      Newer parts - are they real?
Author:  PC:krishna54spamKILLspamHOTMAIL.COM at INTERNET-HUSKY
Date:    05/12/97 15:28


Dear Picsters:
   
I'm looking for people who've actually used the 12C507/8. Has anyone got
any feedback as to the product release status, number of gotchas, or
inventory/price? I thought these were real, but I can't seem to find
them. Also, I'd like to know which development tools people really like
with these.
   
Thanks in advance for your support.
   
Regards, Kris
   
   
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
   

1997\12\05@132729 by Bob Fehrenbach

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Hi Kris,

Krishna Murphy <.....krishna54KILLspamspam.....HOTMAIL.COM> wrote:
>I'm looking for people who've actually used the 12C507/8.

  I assume that you mean 508/509.  I have used the 12C508 on a number
  of small projects and have had very good luck.

  We did have a small problem where a few of the parts with early date
  codes had incorrect oscillator cal values.  Evidently some parts
  intended to have h'F0' came through with h'00' and some intended to
  have h'00' had h'F0'.  In one batch of about 40 parts I found 8 bad
  ones.   I understand that the problem has been corrected.

  I think the parts are great and intend using them on appropriate
  future projects.


>I thought these were real, but I can't seem to find them.

  Our purchasing people have not had any problems finding them. We use
  both through hole and surface mount versions. Try Future or Pioneer.


>Also, I'd like to know which development tools people really like
>with these.

  I use a PICMASTER, still the best tool for PIC's.


--
Bob Fehrenbach    Wauwatosa, WI     EraseMEbfehrenbspam_OUTspamTakeThisOuTexecpc.com

1997\12\05@185941 by wwl

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>I must say that I was impressed by these chips and that fact that
>Microchip worked to get most of the pins as I/O pins. If they had
>just slapped a 16C5x core in an 8 pin package, they wouldn't be
>nearly as useable. 5/6 i/o pins in a 8 pin package is quite an
>achievement.
Yeah, I've used them a lot as well, but I REALLY wish they'd put a
brownout cct in - I usually lose a pin for an external reset!
now when are they going to do one in a sot-23-6 package!
The 12C671/2 are even better - intrc oscillator and an ADC, but not
until feb for production quantities! Also some moron at MCT decided to
support programming them on Promate before Picstart (not due 'til Feb,
but sample devices are already here!)

    ____                                                           ____
  _/ L_/  Mike Harrison / White Wing Logic / wwlspamspam_OUTnetcomuk.co.uk  _/ L_/
_/ W_/  Hardware & Software design / PCB Design / Consultancy  _/ W_/
/_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/

1997\12\07@151717 by Andrew Mayo

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       [snip]
>      Remember also, if you want GP2 as an O/P, setup OPTION so it
> isn't the
>      timer I/P as well as setting TRIS.
>
Yeah. That's a real trap for the unwary. Mchip's documentation, as
always, mentions this but is so disorganised (when *will* they improve
their data sheets [sigh!]) that you have to read the whole DS to find
it.

Another subtle one that had me scratching my head is the 'short device
reset timeout'. Not mentioned in the preliminary data sheet, this causes
the device to pause around 200uS after waking up from sleep after a
reset - during this period all the lines are floating, which is worth
bearing in mind.

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