HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 186

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

Section 3 DSP Operating Unit
The shift amount for the arithmetic shift (PSHA) instruction has a 7-bit field that can represent
values from –64 to +63, but –32 to +32 are valid numbers for the instruction. Also the shift
amount for a logical shift operation has a 6-bit field, but –16 to +16 are valid numbers for the
instruction.
Rev. 3.00 Jan. 18, 2008 Page 124 of 1458
REJ09B0033-0300
DSP type fixed point
DSP type integer
DSP type logical
CPU type integer
S: Sign bit
With guard bits
Without guard bits
Multiplier input
With guard bits
Without guard bits
Shift amount for
arithmetic shift (PSHA)
Shift amount for
logical shift (PSHL)
Longword
: Binary point
39
39
39
39
S
S
Figure 3.8 Data Formats
31 30
31 30
31 30
32 31
31
31
31
31
S
31
S
S
S
22
S
21
S
: Does not affect the operations
16 15
16 15
16 15
16 15
16 15
16 15
0
0
0
0
0
0
0
0
0
–2
–1 to +1 – 2
–1 to +1 – 2
–2
–2
–32 to +32
–16 to +16
–2
8
23
15
31
to +2
to +2
to +2
to +2
8
23
15
31
– 2
–31
–15
– 1
– 1
– 1
–31