[sdiy] self-modifying code was: Re: My latest project

[Antti Huovilainen]

On Thu, 18 Feb 2010, cheater cheater wrote:

>> dsPICs, like most other smaller microcontrollers, and flash based, and maybe
>> Harvard as well, so self-modifying code is pretty much a no-no in this
>> situation (unless you have a *LONG* time to wait for the flash sector to
>> erase before reprogramming it, not mentioning the flash wear issue).
> ah, fair enough!
> Out of curiosity: how difficult is it to keep program data in RAM?

Impossible. Most microcontrollers can only execute from flash rom.
You could write to flash, but it takes time (milliseconds per block 
often) and the flash can only handle 10k - 100k write cycles typically.

> And similarly.. how does SMC work with FPGA's and its family? Is it even 
> possible?

It isn't. FPGAs load the configuration from flash/eeprom serially on 
startup.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova