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Thanks for the info. The same diagram shows CE being asserted followed by OE for a read cycle.
PeterJ 16k 20 42 I added ms delays between every control pin change and made sure the order was consistent with the datasheet, but still no luck. I have edited my question. 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.
When the timer expires, an internal write cycle is triggered and additional writes before it completes. Since I am only using the first three address pins, the rest are tied low. Any help would be much appreciated. 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. You have not indicated that you are doing anything with them?
Post as a guest Name. Initializing pins for write Here is the serial output. 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. If it has, you’ll need to wire up all your address wires in order to disable it.
28C64 Datasheet PDF
Sign up or log in Sign up using Google. Thanks for 28c644 response, supercat. All behave the same. Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. Dstasheet is my code, sorry if it seems too cluttered: The chips are new, and I actually have two from two different manufacturers.
Email Required, but never shown. I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back. I have tied the top 10 address bits low and am only using the dqtasheet 3 for now. I am using the Xicor 28C64AP chip datasheet.
Mar 27 ’13 at Mar 26 ’13 at I have tested an earlier version of the above program with a static RAM chip and everything works great. Here is 28c4 code, sorry if it seems too cluttered:.
28C64 Datasheet, PDF – Alldatasheet
Also, I would suggest that you should write a writebyte procedure which sets all address and data wires to output and datasneet 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 datasheer to output and puts proper values on them, sets all data wires to input, asserts CE dataseet OE, samples all the data wires, and releases CE and OE.
The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF. 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.