QuantiPhi RE version 1.2.3 will soon be available and will support Matlab/Simulink R2011a.
QuantiPhi is the SimuQuest tool which provides all of the low-level software you need to interface with your target microcontroller. QuantiPhi RE is the Renesas Edition of QuantiPhi and supports a selection of Renesas microcontrollers including 16-bit and 32-bit microcontrollers.