Hi Michael,
Please see the C55x v3.x CPU Reference Guide: http://www.ti.com/lit/ug/swpu073e/swpu073e.pdf
The accumulators are memory mapped. Pages 2-5 and 2-6 have the locations of the four accumulators in memory. You can view these in the memory browser in CCS. More information on the accumulators in on page 2-9.
Hope this helps.
-Jon
