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The same diagram shows CE being asserted followed by OE for a read cycle. Here is my code, sorry if it seems too cluttered: That might help things. Post as a guest Name.
I have edited my question. Since I am only using the first three address pins, the rest are tied low. 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.
Mar 26 ’13 at I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page. That will make the remainder of your code much more readable. If it has, you’ll need to wire up all your address wires in order to disable it. Thanks for the info. I have tested an earlier version of the above program with a static RAM chip and everything works great.
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. Home Questions Tags Users Unanswered.
Here is the serial output. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS.
28C64 EEPROM Programming Using Arduino – Electrical Engineering Stack Exchange
Any help would be much appreciated. BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature has previously ratasheet enabled.
Email Required, but never shown. Sign up or log in Sign up using Google. Here is my code, sorry if it seems too cluttered:. The chips are new, and I actually have two from two different manufacturers.
Sign up using Facebook. I am using the Xicor 28C64AP xatasheet datasheet. 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.
28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data
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. When the timer datssheet, an internal write cycle is triggered and additional writes before it completes. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back. All behave datasheeet same. You have not indicated that you are doing anything with them?
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.
28C64 Datasheet PDF –