HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 208
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HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417320.pdf
(1524 pages)
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Section 3 DSP Operating Unit
3.5.11
The S bit in SR is effective for any arithmetic operations executed in the DSP unit, including the
SH’s standard multiply and MAC operations. The S bit in SR is used as the overflow protection
enable bit. The arithmetic operation overflows when the operation result exceeds the range of
two’s complement representation without guard-bit parts. Table 3.31 shows the definition of
overflow protection for fixed-point arithmetic operations, including fixed-point signed by signed
multiplication described in section 3.5.7, Fixed-Point Multiply Operation. Table 3.32 shows the
definition of overflow protection for integer arithmetic operations. The lower word of the
saturation value of the integer arithmetic operation is don’t care. Lower word value cannot be
guaranteed.
When the overflow protection is effective, overflow never occurs. So, the V bit is cleared, and the
DC bit is also cleared when the overflow mode is selected by the CS[2:0] bits.
Table 3.31 Definition of Overflow Protection for Fixed-Point Arithmetic Operations
Table 3.32 Definition of Overflow Protection for Integer Arithmetic Operations
Note:
Rev. 3.00 Jan. 18, 2008 Page 146 of 1458
REJ09B0033-0300
Sign
Positive
Negative
Sign
Positive
Negative
*
Overflow Protection
means don’t care.
Overflow Condition
Result > 1 – 2
Result < –1
Overflow Condition
Result > 2
Result < –2
15
15
– 1
–31
Fixed Value
1 – 2
–1
Fixed Value
2
–2
15
15
– 1
–31
Hex Representation
H'00 7FFF FFFF
Hex Representation
00 7FFF ****
FF 8000 ****
H'FF 8000 0000
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