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Post as a guest Name. I have edited my question. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS.

The timings for this particular EEPROM aren’t super-critical, but it has a timer which starts when the first byte is written and gets reset if another byte is written before it expires. I have tied the top 10 address bits low and am only using the first 3 for now. Dataasheet 16k 20 42 By clicking “Post Your Answer”, you acknowledge that datasheeet have read our updated terms of serviceprivacy policy and cookie policyand that your 28v64 use of the website is subject to these policies.

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, datasbeet 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.


The chips are new, and I actually have two from two different manufacturers. Here is my code, sorry if it seems too cluttered:. 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.

BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature has previously been enabled. I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page. Mar 26 ’13 at Here is my code, sorry if it seems too cluttered: I understand the benefits of separating the code into subroutines and will probably do this, but for now I am just trying to get the byte write working.

You have not indicated that you are doing anything with them? Home Questions Tags Users Unanswered.

28C64 EEPROM Programming Using Arduino – Electrical Engineering Stack Exchange

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Thanks for the info.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and daatasheet policyand that your continued use of the website is subject to these policies. Since I am only using the first three address pins, the rest are tied low.

Here is the serial output. One thing that is missing is on page 7 of the datasheet, it states that you need to write a sequence of codes to disable adtasheet. The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF.


I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back.

28C64 Datasheet

I have tested an earlier version of the above program with a static RAM chip and everything works great. I am using the Xicor 28C64AP chip datasheet.

Sign up or log in Sign up using Google. All behave the same. When the timer expires, an internal write cycle is triggered and additional writes before it completes. Sign up using Facebook. Initializing pins for write Email Required, but never shown. Sign up using Email and Password.

Thanks for the response, supercat. I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. Mar 27 ’13 at Any help would be much appreciated.

28C64 Datasheet pdf – 64K 8K x 8 CMOS E2PROM – Atmel

If it has, you’ll need to wire up all your address wires in order to disable it. That might help things.

That will make the remainder of your code much more readable. The same diagram shows CE being asserted followed by OE for a read cycle.