HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 177

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Table 3.15 Source Register in DSP Operations
Note:
The DSP unit incorporates one control register and DSP status register (DSR). The DSR register
stores the DSP data operation result (zero, negative, others). The DSP register also has the DC bit
whose function is similar to the T bit in the CPU register. The DC bit functions as status flag.
Conditional DSP data operations are controlled based on the DC bit. These operation control
affects only the DSP unit instructions. In other words, these operations control affects only the
DSP registers and does not affect address register update and CPU instructions such as load and
store instructions. A condition to be reflected on the DC bit should be specified to the DC status
selection bits (CS[2:0]).
The unconditional DSP type data instructions other than PMULS, MOVX, MOVY, and MOVS
change the condition flag and DC bit. However, the CPU instructions including the MAC
instruction do not modify the DC bit. In addition, conditional DSP instructions do not modify the
DSR.
Registers
A0, A1
A0G, A1G
X0, X1
Y0, Y1
M0, M1
*
The data is sign-extended and input to the ALU.
Instructions
DSP
operation
Data
transfer
Data
transfer
DSP
Data
transfer
Fixed-point, PDMSB,
PSHA
Integer
Logical, PSHL, PMULS
MOVX/Y.W, MOVS.W
MOVS.L
MOVS.W
MOVS.L
Fixed-point, PDMSB,
PSHA
Integer
Logical, PSHL, PMULS
MOVS.W
MOVS.L
39
Data
Data
Sign*
Sign*
Guard Bits
Rev. 3.00 Jan. 18, 2008 Page 115 of 1458
24-bit data
32
31
40-bit data
16-bit data
16-bit data
16-bit data
16-bit data
16-bit data
Section 3 DSP Operating Unit
Register Bits
32-bit data
32-bit data
32-bit data
16
REJ09B0033-0300
15
0