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Here is the serial output. I have edited my question.
Mar 27 ’13 at Sign up using Email and Password. I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. Thanks for the info.
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.
28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data
The chips are new, and I actually have two from 28c46 different manufacturers. That will make the remainder of your code much more readable. You have not indicated that you are doing anything with them?
Since I am only using the first three address pins, the rest are tied low. Sign up or log in Sign up using Google.
28C64 Datasheet(PDF) – ATMEL Corporation
The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF. I am using the Xicor 28C64AP chip datasheet. I have tested an earlier version of the above program with a static RAM chip and everything works great.
If it has, you’ll need to wire up all your address wires in order to disable it. Thanks for the response, supercat.
Any help would be much appreciated. Home Questions Tags Users Unanswered. That might help things. All behave the same. Sign up using Facebook. BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature has previously been enabled.
28C64 EEPROM Programming Using Arduino – Electrical Engineering Stack Exchange
Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. Here is my code, sorry if it seems too cluttered:. PeterJ 16k 20 42 I wrote a program for the Arduino Uno datashret writes data to the first 4 addresses and then reads the data back.
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Initializing pins for write I’d recommend following that same sequence and also change your write sequence to follow the diagram on the following page. Also, I dayasheet suggest datassheet 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 datxsheet 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.
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.