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'I2C-memory larger than 2048 bytes (previous: No su'
1999\05\04@062509 by Caisson

> Van: John Duncan <spam_OUTj.duncanTakeThisOuTspamBOM.GOV.AU>
> Aan: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
> Onderwerp:
> Datum: dinsdag 4 mei 1999 6:49

Hello John,

 Please don't forget to specify a Subject when writing something ... I had
to use 1.34 seconds to scan the _contents_ of your message to see if it
would interrest me :-).

But on with the show :

> I am writing a program to read and write data to a Microchip 24LC64.  I
> wish to use the random read/write mode. I have the spec sheet for the
> device and I thought I would base my code on the Microchip app note AN567
> .  The spec sheet for the EEPROM device shows that the 2 bytes sent after
> the byte containing the address and direction bit byte are the high order
> and low order bytes of the eeprom location to be addresses. However it
> appears that the code presented in the app note sends only 1 byte for the
> address.  Can anyone shed any light on this for me please.

You are reading documentation regarding Memory-devices larger than 2048
bytes.  Most routines are written for devices _upto_ 2048 bytes.  Those can
be handled by the lower 3 bits that specify a I2C device ( ID ) plus the 8
bits that must be send as an adress (totals 11 bits for an internal
adress).  For devices with an address-range larger than 2048 bytes this
approach does not work anymore.  So, 2 bytes has to be send to address a
specific memory-cell (of 8 bits).

All you have to do is to change the code so that it does not copy the high
3 bits of the address into th ID byte anymore, but write it as an a
High-address-byte after the Low-address-byte is written.  Easy isn't it ?

 Rudy Wieser

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