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'10K of storage was (Static RAM)'
1996\12\11@094731 by Wireless Scientific

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At 8:47 AM 12/11/96, Boston Medical Technologies wrote:
>I'm a PIC newbie (but an EE oldie), and I am just starting to think
>about a project based on a Microchip PIC.  I'll be needing to store up
>to 10k or more of data, which will be accessed in a sequential fashion
>(like a data logger)--take a reading, write to memory, take the next
>reading, write to memory, and so forth.  When we're done taking data, it
>will come out in the same way, that is, sequentially.


how fast are taking the data?
craig

1996\12\11@164323 by Rildo Pragana

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Supposing you don't have speed problem, a couple of milliseconds for each
byte, you could use some EEPROM like the 24C65 from Microchip. It has 64 Kbit
storage, only 8 pins and is inexpensive!  I used it in some projects.
To interface, you will use only 2 PIC pins: data and clock.

regards,
Rildo Pragana

At 8:47 AM 12/11/96, Boston Medical Technologies wrote:
>I'm a PIC newbie (but an EE oldie), and I am just starting to think
>about a project based on a Microchip PIC.  I'll be needing to store up
>to 10k or more of data, which will be accessed in a sequential fashion
>(like a data logger)--take a reading, write to memory, take the next...<snip>

1996\12\11@232314 by n Medical Technologies

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Wireless Scientific wrote:
>
> At 8:47 AM 12/11/96, Boston Medical Technologies wrote:
> >I'm a PIC newbie (but an EE oldie), and I am just starting to think
> >about a project based on a Microchip PIC.  I'll be needing to store up
> >to 10k or more of data, which will be accessed in a sequential fashion
> >(like a data logger)--take a reading, write to memory, take the next
> >reading, write to memory, and so forth.  When we're done taking data, it
> >will come out in the same way, that is, sequentially.
>
> how fast are taking the data?
> craig

Oh, one reading every few seconds or so.

Thanks,

Al Cohen
Boston Medical Technologies

1996\12\12@104211 by Byron A Jeff

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>
> Wireless Scientific wrote:
> >
> > At 8:47 AM 12/11/96, Boston Medical Technologies wrote:
> > >I'm a PIC newbie (but an EE oldie), and I am just starting to think
> > >about a project based on a Microchip PIC.  I'll be needing to store up
> > >to 10k or more of data, which will be accessed in a sequential fashion
> > >(like a data logger)--take a reading, write to memory, take the next
> > >reading, write to memory, and so forth.  When we're done taking data, it
> > >will come out in the same way, that is, sequentially.
> >
> > how fast are taking the data?
> > craig
>
> Oh, one reading every few seconds or so.

Then it's a no brainer: use a serial EEPROM. Two 24C65 holds 16 Kbytes of
data, is nonvolitile, inexpensive, and only requires 2 I/O lines. Code to
read and write these puppies are publicly available. Not sure where though.

Like I said: a no brainer.

BAJ

1996\12\12@122026 by Wireless Scientific
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At 11:24 PM 12/11/96, Boston Medical Technologies wrote:
>Wireless Scientific wrote:
>>
>> At 8:47 AM 12/11/96, Boston Medical Technologies wrote:
>> >I'm a PIC newbie (but an EE oldie), and I am just starting to think
>> >about a project based on a Microchip PIC.  I'll be needing to store up
>> >to 10k or more of data, which will be accessed in a sequential fashion
>> >(like a data logger)--take a reading, write to memory, take the next
>> >reading, write to memory, and so forth.  When we're done taking data, it
>> >will come out in the same way, that is, sequentially.
>>
>> how fast are taking the data?
>> craig
>
>Oh, one reading every few seconds or so.
>
>Thanks,
>
>Al Cohen

well then, like others have mentioned, serial flash comes in a variety of
sizes and with I2C you can gang them up for more storage. I evaluated the
Xicor 24F128 part and found that it's addressing scheme is preferrable to
other serial flash parts in that it uses two full bytes for the address (as
opposed to inter-mixing high address bits and other bits in the packet
preamble). The 24128 worked great with a C program I wrote. ( I actually
implemented fopen, fwrite, fread and fclose as well as a dir structure for
simultanously accessing multiple open files, please don't ask for the
source code).

my advice after doing this, you need to determine your real data storage
requirements, looking at it in terms of can i store my data in two parts
(or maybe more). if you get to use the smaller parts, second source
availibilty is great. if you are forced to choose between the larger parts,
your code might not tolerate vendor switches because of the addressing
format.

craig

1996\12\15@235134 by Giles L. Honeycutt

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I just wanted to mention that the ATMEL 24C64 is also a 2 byte address,
so you are not using up using up any of your address pins for banking.
You are right to point this out, as I think I have seen someone post
in the past with a part that uses all it's address lines and mentioned
banking, and that is not possible.

          Giles L. Honeycutt
          spam_OUTgilesamiTakeThisOuTspamix.netcom.com


Wireless Scientific wrote:
{Quote hidden}

1996\12\17@005814 by Sarunas Cepulis

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Giles L. Honeycutt wrote:
{Quote hidden}

http://www.atmel.com/

       B.Regards
               Saras.

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