How can I copy a 93C86 eeprom to another 93C86 eeprom

Using Arduino Project Guidance
1

Hello!

I am trying to use an arduino I got from SparkFun to copy a 93C86 eeprom to another 93C86 eeprom. There is a tutorial on SparkFun's website (here) for reading and writing eeproms but it is for a 24LC256 that, from what I understand, uses a 2 wire I2C serial interface. If I'm understanding correctly the 93C86 uses a three wire serial interface. In addition the sketch code would be different due to memory addressing, clock speed, and and size of the eeprom.

I have experience with computers and programming but I'm fairly new to arduinos so I really don't know how to change the wiring setup for the 93C86 or what the addressing and stuff would be for the sketch code. I believe I have all of the necessary parts I just am having a hard time figuring out how to set them up.

I have attached what I think is the datasheet for the 93C86.

Any help would be appreciated.

21132F.pdf (203 KB)

2

It looks like an SPI interface except CS is reversed from the usual usage with most other SPI devices. I think a few tries with the different SPI modes will find one that works.

3

Hardware SPI cannot be used for the microwire protocol due to clockings in other than 8 bit increments. Here is a library that implements the needed clocking via bit banging:

With it, you should be able to cobble together a read device 1, write device 2 duplicator.