Recently we had requests for SH2A from Renesas. It has a single chip version with both Flash and SRAM and a 200MHz clock delivering 480 Dhrystone MIPS per MHz.
There is SH versions with an MMU and external memory. They run some POSIX or Linux Operating system; however, versions can't run the single chip version without external memory.
On the other hand, Unison is tiny and offers all the same standards. Along with this small size it has great performance for a SoC MCU without external parts. The hardware interrupt mechanism has bank register switching with multiple banks for lighting fast interrupt processing. It is very impressive.
In addition SH2A has great hardware floating point on board for some versions and hardware fixed point on all versions. It should be a great signal processing and communications engine.
For any high end application short of video compression, this looks like a great choice. If you haven't looked at SH2A yet, and you need a high performance MCU, it is difficult to go wrong here.
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