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Sign up using Email and Password. I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page.
I have edited my question. 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.
When the timer expires, an internal write cycle is triggered and additional writes before it completes. I am using the Xicor 28C64AP chip datasheet. Mar 26 ’13 at You have not indicated that you are doing anything with them?
Email Required, but never shown. Post as a guest Name. I understand the benefits dataeheet separating the code into subroutines and will probably do this, but for now I am just trying to get the byte write working.
I have tested an earlier version of the above program with a static RAM chip and everything works great. Thanks for the info.
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. Any help would be datwsheet appreciated. That might help things. 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 dahasheet 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. Vatasheet is the serial output. The same diagram shows CE being asserted followed by OE for a read cycle.
All behave the same.
28C64 Datasheet pdf – 64K 8K x 8 CMOS E2PROM – Atmel
PeterJ 16k 20 42 Home Questions Tags Users Unanswered. Mar 27 ’13 at The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF.
I have tied the top 10 address bits low and am only using the first 3 for now. That will make the remainder of your code much more readable.
Sign up using Facebook. Sign up or log in Sign up using Google. 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 don’t really like the design, but my guess is that it was trying to be compatible with an earlier part datazheet one could write locations one at a time and just wait after each one.
The chips are new, and I actually have two from two different manufacturers. Here is my code, sorry if it seems too cluttered:.
(Datasheet) 28C64 pdf – 64K EEPROM (1-page)
Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. Thanks for the response, supercat. If it has, you’ll need to wire up all your address wires in order to disable it.