SX28 or SX28L

John Couture

I'm trying to determine the difference between the SX28 and SX28L as a DEVICE directive.· So far I have found:


SX28:
The SX/B online help just says it is a device type.
SX/Key Dev Manual (pg 49)

SX28L:
Al Williams "Exploring ..." book· says·the "L" is a later version but you can use either. (pg 20)

Any ideas?

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John J. Couture

San Diego Miramar College

PJMonty

John,

There seem to be lots of variations of device directives. I don't think there is a really good reason for the existence of most of the variations. For what it's worth, here's part of the code that SASM uses for handling the SX28 device directive variations:

} else if (!strcmpi(str, "SX28AC")
               || !strcmpi(str, "SX28")
               || !strcmpi(str, "SX28L")    //BUG9026
               || !strcmpi(str, "PINS28")){
        device = SX28AC;

As you can see, all the variations are internally converted to the same constant, which means it generates the same fuse settings. In case you're wondering what "bug9026" is, I have no idea. I didn't write that comment, nor do I know who did. If I had to guess, I would assume that whoever originally wrote SASM didn't handle the case of the "L" variant of the SX28 device directive.

Thanks, PeterM

Stephen

That was an early name for a new revision of the SX that included support for an expanded voltage range that was created by Parallax. It was never officially supported by Scenix/Ubicom. Scenix asked to remove it as the datasheet made no mention of the term "SX28L" and it justed created confusion. This was of course before his time when the code was all Parallax's... Seems like so long ago now...