Expanding EEPROM

Started by Paul_Lav July 30, 2003
Just wondering, is it possible to buy a IC to expand EEPROM memory to the pic? And what sort of I/O do they take to run?



Message
 > ust wondering, is it possible to buy a IC to expand EEPROM memory to the pic? And what sort of I/O do they take to run? 
 
It will not expand the on-board EEPROM in a seamless way, but there are numerous external 8-pin EEPROMs available, for instance from Microchip or Atmel. Protocol is SPI or I2C (although they often don't use that name). IIRC Dallas makes EEPROMs with their 1-wire protocol.
 

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
 

 


Message
I have found some EEPROM's. Microchip are the cheapest, anyone ever used one of them? 24LC08BP or 24LC16BP? They are I2C and easily understandable!
 
Thanks,
Paul
----- Original Message -----
From: Wouter van Ooijen
To: p...@yahoogroups.com
Sent: Wednesday, July 30, 2003 9:36 AM
Subject: RE: [piclist] Expanding EEPROM

 > ust wondering, is it possible to buy a IC to expand EEPROM memory to the pic? And what sort of I/O do they take to run? 
 
It will not expand the on-board EEPROM in a seamless way, but there are numerous external 8-pin EEPROMs available, for instance from Microchip or Atmel. Protocol is SPI or I2C (although they often don't use that name). IIRC Dallas makes EEPROMs with their 1-wire protocol.
 

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
 

 


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Microchip has some application notes about I2C. If the PIC you are
using has the MSSP port then I2C hardware is built in. If not, you
can use the 'bit-bang' approach where you wiggle the clock and data
lines with code. If you are only using an EEPROM the bit-bang
approach might be the easiest to implement at least for a start.

--- In , "Paul_Lav" <paul_lav@y...> wrote:
> MessageI have found some EEPROM's. Microchip are the cheapest,
anyone ever used one of them? 24LC08BP or 24LC16BP? They are I2C and
easily understandable!
>
> Thanks,
> Paul
> ----- Original Message -----
> From: Wouter van Ooijen
> To:
> Sent: Wednesday, July 30, 2003 9:36 AM
> Subject: RE: [piclist] Expanding EEPROM > > ust wondering, is it possible to buy a IC to expand EEPROM
memory to the pic? And what sort of I/O do they take to run?
>
> It will not expand the on-board EEPROM in a seamless way, but
there are numerous external 8-pin EEPROMs available, for instance
from Microchip or Atmel. Protocol is SPI or I2C (although they often
don't use that name). IIRC Dallas makes EEPROMs with their 1-wire
protocol.
>
> Wouter van Ooijen
>
> -- -------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products >
> to unsubscribe, go to http://www.yahoogroups.com and follow the
instructions
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.


Hi, the pic is a 16F877. I have found the chapter on the datasheet an am downloading AN578. Would it be easier to do it manually or is this function usefull when going?
 
Thanks,
Paul
----- Original Message -----
From: rtstofer
To: p...@yahoogroups.com
Sent: Friday, August 01, 2003 3:13 PM
Subject: [piclist] Re: Expanding EEPROM


Microchip has some application notes about I2C.  If the PIC you are
using has the MSSP port then I2C hardware is built in.  If not, you
can use the 'bit-bang' approach where you wiggle the clock and data
lines with code.  If you are only using an EEPROM the bit-bang
approach might be the easiest to implement at least for a start.

--- In p...@yahoogroups.com, "Paul_Lav" <paul_lav@y...> wrote:
> MessageI have found some EEPROM's. Microchip are the cheapest,
anyone ever used one of them? 24LC08BP or 24LC16BP? They are I2C and
easily understandable!
>
> Thanks,
> Paul
>   ----- Original Message -----
>   From: Wouter van Ooijen
>   To: p...@yahoogroups.com
>   Sent: Wednesday, July 30, 2003 9:36 AM
>   Subject: RE: [piclist] Expanding EEPROM>    > ust wondering, is it possible to buy a IC to expand EEPROM
memory to the pic? And what sort of I/O do they take to run?
>
>   It will not expand the on-board EEPROM in a seamless way, but
there are numerous external 8-pin EEPROMs available, for instance
from Microchip or Atmel. Protocol is SPI or I2C (although they often
don't use that name). IIRC Dallas makes EEPROMs with their 1-wire
protocol.
>
>   Wouter van Ooijen
>
>   -- -------
>   Van Ooijen Technische Informatica: www.voti.nl
>   consultancy, development, PICmicro products
>    
>
>   
>
>        
>             
>       
>       
>
>   to unsubscribe, go to http://www.yahoogroups.com and follow the
instructions
>
>   ">Yahoo! Terms of Service.