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Re: [avr-chat] avrdude problem with avrisp v2

From: Joerg Wunsch
Subject: Re: [avr-chat] avrdude problem with avrisp v2
Date: Fri, 22 Jun 2007 20:40:27 +0200 (MET DST)

"R C" <address@hidden> wrote:

> Though, I noticed that using a 5V board it works ok, but with a 3.3V
> board no.  Could it be that?

Normally, the AVRISP is supposed to cover Vtarget = 3.3 V.  From the


* Operates at Target Voltages from 2.7V to 5.5V

Perhaps your target is no longer running correctly at Vcc = 3.3 V?
The ISP protocol requires the target to operate, in particular it
requires a stable target clock that is at least 4 times the ISP clock.

Anyway, it doesn't look like avrdude could do anything about it then,
except you might try lowering the ISP speed.  This can be done in
"terminal mode" (-t), and the AVRISP is supposed to remember that

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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