Texas Instruments TMS320C28x Reference Manual page 658

The C flag is affected by the unsigned 33-bit compare operation. The Z,
-
N flags reflect the value in the ACC after the operation is complete. The
operation of the C, N, Z flags should be identical to the C27x implementa-
tion.
The V flag and overflow counter (OVC) are not affected by the operation.
-
On the C27x the V and OVC flags are affected.
The V and OVC flags may be affected on the C27x and not on the C28x imple-
mentation. The values of these flags are not usable under prescribed usage
of such an operation.
Migrating to C28x Object Code
Migration From C27x to C28x F-15