SH7615 Datasheet, PDF (83/925 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH
RISC engine Family/SH7600 Series

DSP fixed decimal
point data
39
With guard bits S
No guard bits
39
Multiplication input
32 31 30
31 30
S
31 30
S
16 15
0
–2⁸ to +2⁸ – 2^–31
0
–1 to +1 – 2^–31
0
–1 to +1 – 2^–15
DSP integer data
39
With guard bits _S
No guard bits
Arithmetic shift (PSHA)
Logical shift (PSHL)
32 31
31
S
31
31
16 15
16 15
22 16 15
S
21 16 15
S
39
31
DSP logical data
16 15
31
SuperH integer (word)
S
(Reference)
S : Sign bit
: Binary decimal point
: Unrelated to processing (ignored)
Figure 2.7 DSP Type Data Formats
0
–2²³ to +2²³ –1
0
–2¹⁵ to +2¹⁵ –1
0
–32 to +32
0
–16 to +16
0
(16 bits)
0
–2³¹ to +2³¹ –1
Rev. 2.00, 03/05, page 45 of 884