RPTBD instruction Precautions:

1. The 3 instructions following the RPTBD cannot modify the PC register. Refer to section 6.x of the C4x UG 1993 for a list of instructions not allowed.

2. The last 4 instructions from the bottom of the block may not be an instruction that modifies the PC value (refer to section 6.1.5 of C4x UG 1993)

 Documentation error: The RC register cannot be initialized as part of the 3 instructions following the RPTBD instruction. The C4x UG 1992 contains several examples where the RC register is loaded incorrectly in that way. This has been corrected in the C4x UG 1993.