The Cypress PSoC line of microcontrollers, especially the PSOC 4 family are very versatile and capable, and seem a natural for use in cubesats.
Unfortunately, at least one experiment: http://www.dtic.mil/get-tr-doc/pdf?AD=ADA616531 showed a PSOC failing immediately in a radiation environment.
However, that article has several problems: 1) it doesn't identify the model of the PSOC (and from the image it appears to be an older board - I can't find any info on it, and the manufacturer of the board no longer has it on their website), 2) they only ran one test on one board before rejecting it, so it's not clear if it was a fluke, and 3) they don't specify whether they shielded the other components on the board, as they did for the MSP430. Finally, the report is now 2 years old, and several new PSOC chips have come out since then.
Several cubesat proposals seem to plan on using PSOC chips, but it is not clear to me if these proposals were ever built or launched. For example:
It's obviously not a rad-hard chip, but neither are the Atmel AVRs, or several other off-the-shelf microcontrollers that have been used successfully in short-duration cubesat missions.
I am wondering if anyone knows of more complete and/or more recent data on how the PSOC, especially the PSOC 4 FAMILY, is likely to behave in a space environment. I would be especially interested in any cases where the chips were actually flown as part of a space mission.