SH7641 Datasheet, PDF (172/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 3 DSP Operation
3.1.10 Local Data Move Instruction
The DSP unit of this LSI provides additional two independent registers, MACL and MACH, in
order to support SH's standard multiply/MAC operations. They can be also used as temporary
storage registers by local data move instructions between MACH/L and other DSP registers Figure
3.17 shows the flow of seven local data move instructions. Table 3.13 shows the variation of this
type of instruction.
PSTS
MACH
MACL
PLDS
X0
Y0
X1
Y1
A0
M0
A1
M1
A0G A1G DSR
Cannot be used
Figure 3.17 Local Data Move Instruction Flow
Table 3.13 Variation of Local Data Move Operations
Mnemonic
PLDS
PSTS
Function
Data move from DSP register to MACL/MACH
Data move from MACL/MACH to DSP register
Operand
Dz
Dz
This instruction is very similar to other transfer instructions. If either the A0 or A1 register is
specified as the destination operand of PSTS, the signed bit is sign-extended and copied into the
corresponding guard-bit parts, A0G or A1G. The DC bit in DSR and other condition code bits are
not updated regardless of the instruction result. This instruction can operate with MOVX and
MOVY in parallel.
Rev. 4.00 Sep. 14, 2005 Page 122 of 982
REJ09B0023-0400