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28C64 Datasheet PDF

Here is my code, sorry if it seems too cluttered: 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 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. Thanks for the response, supercat. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back.

If it has, you’ll need to wire up all your address wires in order to disable it. Email Required, but never shown.

Mar 27 ’13 at I don’t really like the design, but my guess is dataeheet 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. Post as a guest Name. I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck.

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

Here is the serial output. I am using the Xicor 28C64AP chip datasheet.

28C64 Datasheet

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” feature has previously been enabled.

Here is my code, sorry if it seems too cluttered:. When the timer expires, an internal write cycle is triggered and additional writes before it completes. That might help things. PeterJ 16k 20 42 That will make the remainder of your code much more readable.

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

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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. 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 28c644 CE and OE.

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The device has 13 address pins, which should specify an address in daasheet from 0x to 0x1FFF. Sign up using Email and Password. I have tested an earlier version of the above program with a static RAM chip and everything works great. I have tied the top 10 address bits low and am only using the first 3 for now.

The same diagram shows CE being asserted followed by OE for a read cycle. Thanks for the info. I have edited my question.

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