As far as I know very little is cleared when disconnecting the battery on a modern car. Are you looking to clear a fault code or something? You usually need an OBD-II tool (or adapter + phone app) to do that kind of thing.
Yeah, typically ECU will be reset if you disconnect the negative terminal. I never tried it on my RCF, but I have done it on my other 2ZZ Corolla XRS and it always resets everything electronic in the car. In the RCF, I think it removes all of your personalized settings and any codes the computer might have.