28C64 DATASHEET PDF

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I understand the benefits of separating the code into subroutines and will probably do 286c4, but for now I am just trying to get the byte write working.

28C64 EEPROM Programming Using Arduino – Electrical Engineering Stack Exchange

I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. One thing that is missing is on page 7 of the datasheet, it states that you need to datasueet a sequence of codes to disable write-protection.

Email Required, but never shown. Here is my code, sorry if it seems too cluttered: By clicking “Post Your Answer”, you acknowledge that you have read dqtasheet updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data

All behave the same. Mar 26 ’13 at Here is the serial output.

I have edited my question. Any help would be much appreciated.

Here is my code, sorry if it seems too cluttered:. If it has, you’ll need to wire up all your address wires in order to disable it. I am using the Xicor 28C64AP chip datasheet.

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28C64 Datasheet

Mar 27 ’13 at The timings for this particular EEPROM aren’t super-critical, but it has a timer which starts when the vatasheet byte is written and gets reset if another byte is written before it expires. Home Questions Tags Users Unanswered. Since I am only using the first three address pins, the rest are tied low.

BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” datqsheet has previously been enabled. You have not indicated that you are doing anything with them? Sign up using Facebook. I have tested an earlier version of the above program with a static RAM chip and everything works great. Looking at the datasheet on page datasyeet it shows a timing diagram and Chip Enable Access Time can be up to nS.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Sign up or log dstasheet Sign up using Google. The chips are new, and I actually have two from two different manufacturers.

Initializing pins for write Thanks for the info. PeterJ 16k 20 42 Post as a guest Name. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back.

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Thanks for the response, supercat. Sign up using Email and Password. That will make the remainder of your code much more readable. I don’t really like the design, but my guess is that it was trying to be compatible with an earlier part where one could write locations one at a time and just wait after each one.

Also, I would suggest that you should write a writebyte procedure which sets all address and data wires to output and puts proper values on them, ensures WE and OE are deasserted, asserts CE, asserts and release WE, and releases CE, and a readbyte procedure which sets all address wires to output and puts proper values on them, sets all data wires to input, asserts CE and OE, samples all the data wires, and releases CE and OE. When the timer expires, an internal write cycle is triggered and additional writes before it completes.

I have tied datzsheet top 10 address bits low and am only using dtasheet first 3 for now. I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page. The same diagram shows CE being asserted followed by OE for a read cycle. The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF. That might help things.