SH7713 Datasheet, PDF (147/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 3 DSP Operating Unit
Tables 3.14 and 3.15 show the data type of registers used in DSP instructions. Some instructions
cannot use some registers shown in the tables because of instruction code limitations. For
example, PMULS can use A1 as the source register, but cannot use A0. These tables ignore details
of register selectability.
Table 3.14 Destination Register in DSP Instructions
Registers
A0, A1
A0G, A1G
X0, X1
Y0, Y1
M0, M1
Instructions
DSP
Fixed-point, PSHA,
operation PMULS
Integer, PDMSB
Logical, PSHL
Data
transfer
MOVS.W
MOVS.L
Data
transfer
MOVS.W
MOVS.L
DSP
Fixed-point, PSHA,
operation PMULS
Integer, logical,
PDMSB, PSHL
Data
transfer
MOVX/Y.W, MOVS.W
MOVS.L
Guard Bits
Register Bits
39
32 31
16 15
0
Sign-extended 40-bit result
Sign-extended 24-bit result
Cleared
16-bit result
Sign-extended 16-bit data
Sign-extended 32-bit data
Data
No update
Data
No update
32-bit result
Cleared
Cleared
Cleared
16-bit result Cleared
16-bit result
32-bit data
Cleared
Rev.1.50 Aug. 30, 2006 Page 107 of 860
REJ09B0288-0150