'Large EEPROM for PIC'
I would like to make some kind of data logger with PIC. Has anybody some
experiece with 1 or 2Mbit EEPROMs with PIC.
If you have, than what kind of EEPROM did you use?
At 01:30 PM 10/4/99 +0200, Nagy Zoltan wrote:
>I would like to make some kind of data logger with PIC. Has anybody some
>experiece with 1 or 2Mbit EEPROMs with PIC.
Atmel makes some nice serial flash devices that work well in datalogging
|Nagy Zoltan wrote:
> I would like to make some kind of data logger with PIC. Has anybody some
> experiece with 1 or 2Mbit EEPROMs with PIC.
> If you have, than what kind of EEPROM did you use?
The only EEPROMs with that kind of density are parallel (ie: lots pins
needed on the controller!).
My last project was designed to handle up to 4 1Mbit or 2 4Mbit EEPROMs
(Xicor). I used the PortD on a '74A to do a muxed data/low address bus,
an HC373 to demux it for the EEPROMs, PortB to generate addresses A15 to
A8, PortE for the /RD, /WR, ALE, and I bit-banged the /CEs, and A18-A16
on some of the (few) remaining pins.
If you need more specifics, feel free to contact me off list.
BTW, there are some high density serial Flash devices available that
would dramatically decrease pin usage.
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Byron A Jeff
> Nagy Zoltan wrote:
> > I would like to make some kind of data logger with PIC. Has anybody some
> > experiece with 1 or 2Mbit EEPROMs with PIC.
> > If you have, than what kind of EEPROM did you use?
> The only EEPROMs with that kind of density are parallel (ie: lots pins
> needed on the controller!).
Not necessarily true. Atmel's DataFlash has both 8 and 16 Mbit capacities
with serial interfaces and large (528 byte) dual ram buffers. Also with the part
it's possible to fill one buffer for writing while the other is actually
being written to the flash.
All in all a very cool part.
> BTW, there are some high density serial Flash devices available that
> would dramatically decrease pin usage.
And exactly how does EEPROM and Flash differentiate so significantly that
one could not be used in place of the other?
Byron A Jeff wrote:
> > The only EEPROMs with that kind of density are parallel (ie: lots pins
> > needed on the controller!).
> Not necessarily true. Atmel's DataFlash has both 8 and 16 Mbit capacities
> with serial interfaces and large (528 byte) dual ram buffers.
He asked about EEPROMs, my reply referred to EEPROMs.
> > BTW, there are some high density serial Flash devices available that
> > would dramatically decrease pin usage.
> And exactly how does EEPROM and Flash differentiate so significantly that
> one could not be used in place of the other?
Byte erasability, for one.
I have interfaced the Atmel AT25P1024 to a Scenix SX28AC. It's rather
straightforward and it can enhance many projects considerably. I also have a
big SRAM hooked up that I use for the buffer to and from the serial EEPROM.
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