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Initializing pins for write 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. Post as a guest Name. Thanks for dataeheet response, supercat. When the timer expires, an internal write cycle is triggered and additional writes before it completes.
eatasheet 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. Here is the serial output. Home Questions Tags Users Unanswered.
28C64A-15 – 28C64A 64K 150ns Parallel EEPROM Technical Data
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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.
BTW, if the chips are equipment pulls as opposed to new parts, it’s possible that the “software protection” feature 2864 previously been enabled. Thanks for the info.
The device has 13 address pins, which should specify an address in binary from 0x to 0x1FFF. I’d 28c4 following that same sequence and also change your write sequence to follow the diagram on the following page.
Looking at the datasheet on page 12 it shows a timing diagram and Chip Enable Access Time can be up to nS. Since I am only using the eatasheet three address pins, the rest are tied low.
I added ms delays between every control pin datasheft and made sure the order was consistent with the datasheet, but still no luck. I have edited my question. Here is my code, sorry if it seems too cluttered: Sign up or log in Sign up using Google.
(Datasheet) 28C64 pdf – 64K CMOS EEPROM (1-page)
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 releases CE and OE. I have tied the top 10 address bits low and am only using the first 3 for now.
Dataheet 16k 20 42 The same diagram shows CE being asserted followed by OE for a read cycle. If it has, you’ll need to wire up all your address wires in order to disable it.
28C64 EEPROM Programming Using Arduino – Electrical Engineering Stack Exchange
Mar 26 ’13 at I wrote a program for the Arduino Uno that writes data to the first 4 addresses and then reads the data back.