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Re: [avr-gcc-list] address@hidden ... what is it for ?!

From: Tobias Frost
Subject: Re: [avr-gcc-list] address@hidden ... what is it for ?!
Date: Tue, 06 Jan 2009 23:00:11 +0100

On Tue, 2009-01-06 at 13:40 -0600, David Kelly wrote:

> Notice the starting address of eeprom is 1 byte above the physical
> address of start of eeprom because there was some rumor stating some
> models of AVR would accidentally trash the first byte under some
> circumstances. Perhaps when the rest of the device was wiped for a code
> reload or something? Anyway, it was cheaper to do without the first byte
> than to worry about it.

Older AVRs had the problem, if a the voltage dropped under the limit
during a eeprom write, adr 0 was corrupted as well as the one written.

But current AVRs -- at least with the brown out detector enabled -- does
not show this bug anymore...


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