Jan 15, 2021
ROHM’s newly 125°C operation compatible I2C bus EEPROMs, BR24H-5AC targets applications that require data storage under harsh environments.
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ROHM’s newly 125°C operation compatible I2C bus EEPROMs, BR24H-5AC targets applications that require data storage under harsh environments.
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Modifying Subaru ECU
Modifying the ECU
The ECU has provision for an external EPROM, to allow the firmware to be updated. In 1992, Subaru did issue a firmware update for the USDM model SVX but it is unclear what issues this fixed. To update the firmware, you insert an EPROM into the upgrade socket and then cut resistor J1. Cutting the resistor tells the ECU to use the update EPROM rather than the original ROM.
Modifyi…
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Okay I kinda hit a roadblock, the schematic I've been using (MEEPROMMER) only supports up to 16bit addresses while my chip uses 19bit addresses, and rewriting both the Arduino firmware and the Java programmer is going to be a pain in the ass, not to mention the more I read the AT29C040A datasheet the less I understand how to program it. Anyone who can help me is more than welcome to.