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DSP type fixed point
With guard bits
Without guard bits
Multiplier input
DSP type integer
With guard bits
Without guard bits
Shift amount for
arithmetic shift (PSHA)
Shift amount for
logical shift (PSHL)
DSP type logical
CPU type integer
Longword
S: Sign bit
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.
39
31 30
S
31 30
S
39
31 30
S
39
32 31
S
31
S
31
31
39
31
31
S
: Binary point
Figure 2.10 Data Formats
16 15
16 15
16 15
22
16 15
S
21
16 15
S
16 15
: Does not affect the operations
Rev. 4.00 Sep. 14, 2005 Page 43 of 982
Section 2 CPU
0
8
8
–31
–2
to +2
– 2
0
–31
–1 to +1 – 2
0
–15
–1 to +1 – 2
0
23
23
–2
to +2
– 1
0
15
15
–2
to +2
– 1
0
–32 to +32
0
–16 to +16
0
0
31
31
–2
to +2
– 1
REJ09B0023-0400
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