AVR-Chat

On Apr 8, 2006, at 9:38 PM, scmikes03 wrote:

> Hello All,
>
> I downloaded 4.12 and applied service pack 2.
>
> I created a winavr project
>
> I snagged some sample butterfly code from
> http://www.siwawi.arubi.uni-kl.de/avr_projects/#bf_app
>
>
> I set the device type to simulator, 169.
>
> How do I set the simulator to use the 4 meg flash memory.
>

> This makes sense since the Program memory is 129.3%
>
>
>
> Newbie Question:  the 129.3% Full, shouldn't the 29.3% roll over to
> the flash memory?

No;  the AVR can't execute instructions directly from external  
memories like that.

There are a few (relatively rare) AVR parts that can execute from RAM  
(one of the USB ones comes to mind), but no others that I know of  
that can execute normal AVR instructions from external memory.  
Especially serial flash memory like that, which takes quite a few  
cycles to move a single byte.

This doesn't mean that you couldn't write a program that could  
execute some kind of code from that memory; it just means that the  
AVR itself can't do that.

-- 
Ned Konz
ned@bike-nomad.com




-- 
Ned Konz
MetaMagix embedded consulting
MetaMagix@gmail.com