28C64 DATASHEET PDF

AT28C64, 28C64 Datasheet, 28C64 64K ns Parallel PLCC EEPROM Datasheet, buy 28C 28C64 datasheet, 28C64 pdf, 28C64 data sheet, datasheet, data sheet, pdf, Atmel, 64K 8K x 8 CMOS E2PROM. 28C64 64K (8K x 8) CMOS E2prom with Page Write and Software Data Protection Features. Fast Read Access Time ns Automatic Page Write Operation.

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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, datashheet 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 datashset wires to input, asserts CE and OE, samples all the data wires, and releases CE and OE.

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

I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. I understand the dafasheet of separating the code into subroutines and will probably do this, but for now I am just trying to get the byte write working.

Initializing pins for write Post as a guest Name. That will make the remainder of your code much more readable. Here is the serial output. BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature has previously been enabled.

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Here is my code, sorry if it seems too cluttered: I have tied the top 10 address bits low and am only using the first 3 for now. Any help would be much appreciated. I have tested an earlier version of the above program with a static RAM chip and everything works great.

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

All behave the same. I wrote a program for the Arduino Uno that writes data to the first 4 datasheeet and then reads the data back.

Home Questions Tags Users Unanswered. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. If it has, you’ll need datashewt wire up all your address wires in order to disable it. The same diagram shows CE being asserted followed by OE for a read cycle. That might help things.

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28C64 Datasheet, PDF – Alldatasheet

Sign up or log in Sign up using Google. 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 write-protection.

The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF. The chips are new, and I actually have two from two different manufacturers. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Thanks for the datashset.

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28C64 Datasheet PDF

Mar 26 ’13 at 288c64 recommend following that same sequence and also change your write sequence to follow the diagram on the following page. 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. When the timer expires, an internal write cycle is triggered and additional writes before it completes.

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.

Here is my code, sorry if it seems too cluttered:.

Thanks for the response, supercat. Since Dstasheet am only using the first three address pins, the rest are tied low.

PeterJ 16k 20 42 I have edited my question. You have not indicated that you are doing anything with them? Mar 27 ’13 at Sign up using Facebook. 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 am using the Xicor 28C64AP chip datasheet. Email Required, but never shown.