SH7729R Datasheet, PDF (134/855 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Conditional Operations and Data Transfer: Some DSP instruction can be executed
conditionally, as described earlier. The specified condition is valid only for the B field of the
instruction, and is not valid for data transfer instructions for which a parallel specification is made.
Examples are shown in figure 2.17.
DCT PADD X0,Y0,A0 MOVX.W @R4+,X0 MOVY.W A0,@R6+R9 ;
When condition is True
Before execution: X0=H'33333333, Y0=H'55555555, A0=H'123456789A,
R4=H'00008000, R6=H'00008233, R9=H'00000004
(R4)=H'1111, (R6)=H'2222
After execution: X0=H'11110000, Y0=H'55555555, A0=H'FF88888888,
R4=H'00008002, R6=H'00008237, R9=H'00000004
(R4)=H'1111, (R6)=H'3456
When condition is False
Before execution: X0=H'33333333, Y0=H'55555555, A0=H'123456789A,
R4=H'00008000, R6=H'00008233, R9=H'00000004
(R4)=H'1111, (R6)=H'2222
After execution: X0=H'11110000, Y0=H'55555555, A0=H'123456789A,
R4=H'00008002, R6=H'00008237, R9=H'00000004
(R4)=H'1111, (R6)=H'3456
Figure 2.17 Examples of Conditional Operations and Data Transfer Instructions
Assignment of NOPX and NOPY Instruction Codes: When there is no data transfer instruction
to be parallel-processed simultaneously with a DSP operation instruction, an NOPX or NOPY
instruction can be written as the data transfer instruction, or the instruction can be omitted. The
instruction code is the same whether an NOPX or NOPY instruction is written or the instruction is
omitted. Examples of NOPX and NOPY instruction codes are shown in table 2.34.
Rev. 5.0, 09/03, page 88 of 806