View Full Version : BS2 and 2816 EEPROMs
02-24-2005, 06:35 AM
i'm working on a project with a BS2 that will require an extreme amount of data to be stored and retrieved. having a few 2816 eeproms on hand, i was thinking of using·one of them to store the info. before i reinvent the wheel, i thought i'd ask the guru's if/how this has been accomplished in the past and if anyone had any constructive advice for me.
02-24-2005, 08:38 AM
How much data are you thinking of. 8 k, 64 k 1.4 meg, megabytes?
02-24-2005, 10:09 AM
I did a quick search on Google and apparently the 2816 eeprom is a whopping 2K bytes. If you need more storage, Microchip's 24LC256 (32K bytes) can be easily interfaced to BS2. Check out Nuts and Volts #115 for the article and programs at www.parallax.com/html_pages/downloads/nvcolumns/Nuts_Volts_Downloads_V5.asp (http://www.parallax.com/html_pages/downloads/nvcolumns/Nuts_Volts_Downloads_V5.asp)
02-24-2005, 06:12 PM
Or you could jsut go for a BS2p or BS2pe which can store data in unused program banks. (BS2p has 8 x 2KB and BS2pe has a whopping 16 x 2KB and is meant for data capture )
No hassle with doing SEROUT/I2COUT/BitBanging/Shift-registers or anything.
02-24-2005, 09:36 PM
thanks for the replies. you're all right. being the penny-pinch'n miser i am, and having extra parts laying around, i just wanted to reuse the parts. i appreciate the information and the direction guys!
for the pure reason of "it can be done", i'd still be interested to know if anyone's interfaced a 2816 to a BS2...
02-24-2005, 10:35 PM
I have ask tech support for clarification for the program memory in the 2p and 2pe.
I have never heard of a cpu that could alternatly use either 8 bit program memory or 16 bit program memory. Usiually it is 1 or the other.
The solutions cubed serial memory uses a non volital(nv) ram which is somewhat similar to eerom with a cpu on board to handel the serial to parallel and parallel to serial conversion.
02-24-2005, 11:56 PM
The BS2pe contains 16 banks of 2kb. Eight of these banks can be used for programs a la the BS2p and others. The remaining 8 banks are used for data storage exclusively and can not contain programs.
02-26-2005, 02:27 AM
where did you find doc specifically on the data only 16 k eerom for the 2pe?
I have searched everywhere including the download 2.1 basic stamps manual and founf nothing?
02-26-2005, 03:41 AM
You can find it here, among other places:
It also appears in the Stamp Comparison document which can be downloaded near the bottom of that same web page.