Hmm, section 1.4 in the datasheet I happen to look at seems to show, in quite some details, how data is exchanged and they let you know that more details can be found in the SH-2 Reference Manual.

With that said, I have not used it and can't say if the information provided is of any use in practice :-) I've seen datasheets with a lot less information than that though.

/Henrik.