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Re: [avr-gcc-list] reset disable (rstdisbl)

From: Graham Davies
Subject: Re: [avr-gcc-list] reset disable (rstdisbl)
Date: Mon, 10 Oct 2005 10:38:37 -0400

Patrick Blanchard wrote:

> is [the fact that once you program the
> External Reset Disable fuse, you can't
> use the ISP] a flaw of Atmel's design,
> or of avrdude?

It is an aspect of Atmel's design.  This is one of the several paths you can
take when working with Atmel MCUs from which you can't directly return.
Others are inappropriate clock source settings and lock bit settings.  It
isn't really a flaw; it's the way they work.  Other microcontrollers have
similar features which, if you don't understand them, can trip you up.

Many of these gotchas can also be worked around with the JTAG interface,
which doesn't need the reset or even a working clock (it has its own).  But,
not all the devices have this interface (it takes up four pins) and the 168
does not so this doesn't help with your immediate problem.  Looks like it's
high voltage programming for you.


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