Dear All, Two years I attended a Hitachi Embedded Seminar. They presented theirembedded low power Flash microcontrollers there. The Presenter said: "If you look to the die you'll see that the cpu is only a smallfraction and the flash part occupies much of it. Especially if theflash size is >32k." If this is real why don't they change the architecture to save someflash size?Any Comments? I am sure somebody has already worked on it.

Hi, the modern trend is to write single chip applications in C, much easierthan assembler for micros like the Hitachi range. The consequence is that youneed all that extra memory, both rom and ram, for allmost any practicalprogram.

reducing flash size in embedded processors?

Oct 02, 2004 62 Replies

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Alexei A. Frounze 21 years ago

...

can't

That's implied, obviously. No one would like to drive such a car. A test drive could be the last drive. :)

Alex

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Spehro Pefhany 21 years ago

Reversal of phase in a control system is very bad news indeed.

Best regards, Spehro Pefhany

"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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Kelly Hall 21 years ago

I almost broke a foot that way.

Our torque tool would run up against the stop and the error integral would get larger and larger until the hydralic valve was all the way open and the tool putting out around 2200 foot-pounds of torque.

Then *bam*, the error term rolled over, the hydralic value slammed to the other stop, and the 75 pound tool would do a nice back flip as it immediately tried to apply 2200 foot pounds of torque in the other direction.

Since the test setup was near my desk, debugging that problem meant standing way the hell out of the way. At first I wouldn't believe it was a software problem ("Gee Jeff, where do you buy such crummy proportional valves?"). Now I have a better understanding of saturating math and defensive coding and keep an open mind when troubleshooting. :)

Probably still some pictures of the tool online at

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"Turning Point 2000" was the product, although the control system was almost identical to the big tool.

Kelly

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