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Re: [avr-gcc-list] Macro to read /write long to eeprom

From: Jonathan Goldberg
Subject: Re: [avr-gcc-list] Macro to read /write long to eeprom
Date: Wed, 10 Aug 2005 07:58:06 -0400
User-agent: Mozilla Thunderbird 1.0.2 (X11/20050317)

Branislav Katreniak wrote:

I suppose that the trick is to check whether the value in eeprom is not
equal to the value being written. If it matches, no write is needed and
you save 9ms. Another trick is not to clear the byte in eeprom before
the write when it is sufficient to only clear bits on order to store the
value into eeprom (you save half of the write). There is some datasheet
on atmel site about this.

This technique saves time when the value being written does not totaly


This procedure not only saves execution time, but prolongs the life of the EEPROM memory cells as well. This is very beneficial if you are writing frequently to the same locations. Most EEPROMs are rated for 100,000 erase/write cycles across the temperature range.


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