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Re: [avr-chat] Dragon: mega slow at dumping Flash, normal ?

From: Bob Paddock
Subject: Re: [avr-chat] Dragon: mega slow at dumping Flash, normal ?
Date: Sat, 4 Jul 2009 07:37:59 -0400

> You're perhaps confusing that with debugWIRE.  As debugWIRE is a
> one-wire protocol, it has to live with delays, caused by RC time
> constants of the circuitry.
> ISP is basically the SPI engine of the controller, running in slave
> mode.  As the entire SPI engine is a synchronous system clocked by the
> IO clock of the AVR, the IO clock must be quite a bit faster than the
> ISP clock (the ISP clock line itself is sampled within the SPI engine,
> and ISP clock edges are detected during that sampling).

I have a question related to debugWIRE vs SPI internal to a Tiny88.
A colleague of mine, new to AVRs, tried to use debugWIRE to step
through some code that I gave him.  In my code I turned off the SPI
port through the Power Reduction Register.

Once he hit that point, the part died.  Anyway to recover them?
I did not expect to see any interaction of the SPI and debugWIRE


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