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The markings look like an Atmel part (it starts with "AT", which is common for Atmel parts). Given the size of the chip and context which you provided, I figured it was probably a serial EEPROM. Looking through Atmel's serial EEPROM datahsheets, your mystery chip is almost certainly an Atmel AT25128B-SSHL SPI EEPROM, which matches your chip's product ...


2

My guess is that the protocol is standard, using a non standard protocol between two devices involves using bitbanging which is not very useful. Let's assume then that the protocol is standard. It's not SPI, SPI needs 4 lines To work. I2C needs two, RS232 needs only two. I don't know what the third line job is, maybe it's used for trigerring/synchronization ...


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You can try this:- All Data Sheet (sorry this won't allow me to post more than 2 links, you can refer wikia page for other sites like All Data Sheet) Identifying and deciphering the part number Deciphering a chip's part number is a very ambitious process and most of the time, typing the whole part number in a search engine gets you nowhere. ...


1

It may be possible. Based on the data sheet you posted, you need to see if Pin 9 is tied directly to ground, or can be controlled by the CPU. If it can be controlled, the chip can be re-programmed. If Pin 9 is tied to the CPU, you may then be in the realm of trial-and-error to see how to control that pin.


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Googling for the 49758 gives some results: Description Datasheet prefix 3U probably means that its a 3V version of the part


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I found a nice guide while trying to do the same: http://www.instructables.com/id/How-to-reverse-engineer-a-schematic-from-a-circuit/


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