SH7729R Datasheet, PDF (126/855 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Table 2.31 Correspondence between DSP Instruction Operands and Registers
Register Sx
A0
Yes
A1
Yes
M0
M1
X0
Yes
X1
Yes
Y0
Y1
ALU and BPU Operations
Sy
Dz
Du
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Multiply Operations
Se
Sf
Dg
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
When writing parallel instructions, the B-field instruction is written first, followed by the A-field
instruction. A sample parallel processing program is shown in figure 2.16.
PADD A0, M0, A0 PMULS X0, Y0, M0 MOVX.W @R4+, X0 MOVY.W @R6+, Y0 [;]
DCF PINC X1, A1
MOVX.W A0, @R5+R8 MOVY.W @R7+, Y0 [;]
PCMP X1, M0
MOVX.W @R4+, X0 [NOPY] [;]
Figure 2.16 Sample Parallel Instruction Program
Square brackets mean that the contents can be omitted.
The no operation instructions NOPX and NOPY can be omitted. Table 2.32 gives an overview of
the B field in parallel operation instructions.
A semicolon is the instruction line delimiter, but this can also be omitted. If the semicolon
delimiter is used, the area to the right of the semicolon can be used as a comment field. This has
the same function as with conventional SH tools.
The DSR register condition code bit (DC) is updated on the basis of the result of an unconditional
ALU or shift operation instruction. Conditional instructions do not update the DC bit. Multiply
instructions, also, do not update the DC bit. The DC bit updating conditions are determined by bits
CS0 to CS2 in the DSR register. The DC bit update rules are shown in table 2.33.
Rev. 5.0, 09/03, page 80 of 806