HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 166

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Multiply is always unconditional, but does not affect any condition code bits, DC, N, Z, V, and
GT, in DSR.
• Overflow Protection
Rev. 1.00, 02/04, page 128 of 804
The S bit in SR is effective for this multiply operation in the DSP unit. See section 3.5.11,
Overflow Protection, for details.
If the S bit is 0, overflow occurs only when H'8000*H'8000 ((-1.0)*(-1.0))
operation is executed as signed fixed-point multiply. The result is H'00 8000 0000 but it
does not mean (+1.0). If the S bit is 1, overflow is prevented and the result is H'00 7FFF
FFFF.