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Why bitwise rotate through CC bit?

Category: Hardware
Product Number: ADSP-BF706

As per the BF70x programming reference Page 398, section "Shift_Rot32 Description", the barrel shifter performs the rotation through the ASTAT.CC bit.

What is the logic behind this behaviour ? 

Is it possible to just rotate the contents of a data register without involving the CC bit? If yes, how ?