Re: AVR Flash EMI Susceptibility?

From: jetmarc (jetmarc_at_hotmail.com)
Date: 11/17/04 

Date: 17 Nov 2004 03:54:42 -0800

> susceptibility (Murphy says we can't), I guess I'll be forced to forgo the
> flexibility of in-the-field serial reprogramming and disable
> self-programming via the fuse bits. I *think* self programming via the SPM
> instruction is the only way to do a page erase.

I dont want to scare you, but a fuse-bit is a only a flash cell, too.
If the EMI conditions are such that the chip does an SPM to the wrong
page or where no SPM instruction actually was, it can just as well do
an SPM where the fuse-bit said "NO".

As long as the voltage pumps are on-chip, things can go wrong. Less
logic to operate them can make it less probable (eg chip without SPM
funcionality), but only removing them completely will make the chip
safe (eg external VPP like in the old days).

Thats my opinion only, certainly flash mcu manufacturers have a different
one.

Marc

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