Has anyone tried interfacing with one of these Fujitsu microprocessors? They're typically used for automotive controls, like the gauge cluster in motorcycles.
Development hardware is outrageously expensive for these things, so if there was a way to use the 'duino instead, I'd be muy happier! 
Those processors are very specific, specialised devices for automotive use. Specifically they are intended for use in CAN bus networks, and although I don't know the chip you are referring to I have seen others which are only avilable mask programmed or where the CAN bus has a software updater on it. I don't know what you wanted to do, but it might be best to find another way.
The Geek
The ultimate goal is to build a home-brew data logger, which is able to capture data out of the Fujitsu chip's flash. More current models of my bike have this ability via a USB device, but it's cheaper (and more fun) to figure out how to do it myself!
I know this device is flash-based, and can be programmed in the field. Fujitsu even has sample code and utils availble for free download (don't even need to register to get them), but if you don't have the hardware that can talk to it, they're not much use.