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'[PIC]: CCS routine for accessing I2C EEPROM on 12C'
2001\11\13@153046 by Lawrence Lile

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Does CCS have an I2C routine specifically written to access the EEPROM
memory on 12CE518's? Has anybody tried the standard I2C routines for this
job with any success? I'm getting ready to port the Microchip ASM code into
aCCS C function, and don't want to reinvent the wheel here.

Not asked: WHAT was microchip smoking when they decided to access internal
EEPROM memory with an I2C routine??? Did they consult Rube Goldberg?  Is
there a more devious way we could access memory on a part with 512 bytes of
code??  Sheesh.

-- Lawrence

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2001\11\13@161507 by Chris Carr

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Laurence Life wrote
> Not asked: WHAT was microchip smoking when they decided to access internal
> EEPROM memory with an I2C routine???

That question had crossed my mind except it was interspersed with expletives

>Did they consult Rube Goldberg?

Who? Consults Search Engines. Oh, I like it, He's obviously now designing
Microchip's new improved website

>Is
> there a more devious way we could access memory on a part with 512 bytes
of
> code??  Sheesh.

I'm sure someone on this list can come up with one. Sorry Chaps and
Chapess's,
I could not resist 8-)

Regards

Chris Carr

p.s. Laurence, do you know you have yr "Reply To" set, you almost got
an Off-List reply from me

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2001\11\13@163746 by Tony Nixon

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Lawrence Lile wrote:

> Not asked: WHAT was microchip smoking when they decided to access internal
> EEPROM memory with an I2C routine??? Did they consult Rube Goldberg?  Is
> there a more devious way we could access memory on a part with 512 bytes of
> code??  Sheesh.

Didn't they just 'add on' a serial EEPROM die and connect it with it's
I2C interface via 2 IO pins?

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Best regards

Tony

mICros
http://www.bubblesoftonline.com
spam_OUTsalesTakeThisOuTspambubblesoftonline.com

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2001\11\13@175748 by Lawrence Lile

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Buried in the CCS manual I found a reference to the answer to my  question:

"Microchip top engineer and website designer Rube Goldberg was smoking a
spleef when he decided to hack the 12C508 together with a 16 byte external
eeprom.  Several astute PIClisters have observed that the device is two die
bonded
onto the same chip, and it was also two spleefs bonded together in the
hapless engineer's drug-crazed lips.  CCS engineers, after pulling out all
their hair, included a file ex_extee.c that tells the rest of this sorry
tale of intrigue, depravity, and paranoia.  "

It's right there on page 196!  Look it up!

-- Lawrence

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2001\11\13@175810 by Bob Barr

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Reposted (to the list this time). I need to read the reply-to field
before I hit 'Send'.

On Tue, 13 Nov 2001 14:28:30 -0600, you wrote:
>
>Not asked: WHAT was microchip smoking when they decided to access internal
>EEPROM memory with an I2C routine??? Did they consult Rube Goldberg?  Is
>there a more devious way we could access memory on a part with 512 bytes of
>code??  Sheesh.
>

I could be totally out in left field on this but, as I understand it,
the CE parts are composed of the MPU die and a separate EEPROM die
packaged together. By die-bonding a few lines between the two die, the
IIC interface allows the MPU to access the EEPROM die.

Regards, Bob

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