Delta DVP-SA2

3. Instruction Set
3-93
Program Example 1:
The 16-bit value K100 in D0 is multiplied by the 16-bit value K200 in D10, and the product is stored
in D20. Whether the product is a positive value or a negative value depends on the leftmost bit (bit
15) in D20. If bit 15 in D20 is 0, the product stored in D20 is a positive value. If bit 15 in D20 is 1,
the product stored in D20 is a negative value.
X0
MUL16
D0 D10 D20
16-bit value×16-bit value=16-bit value
 D0 × D10 = D20
 D0=K100, D10=K200, D20=K20,000
Program Example 2:
The 32-bit value K10,000 in (D1, D0) is multiplied by the 32-bit value K20,000 in (D11, D10), and
the product is stored in (D21, D20). Whether the product is a positive value or a negative value
depends on the leftmost bit (bit 31) in (D21, D20). If bit 31 in (D21, D20) is 0, the product stored in
(D21, D20) is a positive value. If bit 31 in (D21, D20) is 1, the product stored in (D21, D20) is a
negative value.
X0
MUL32
D0 D10 D
20
32-bit value×32-bit value=32-bit value
 (D1,D0) ×(D11,D10) = (D21,D20)
 (D1,D0)=K10,000, (D11,D10)=K20,000, (D21, D20)=K200,000,000
Note:
1. If the product of a 16-bit multiplication is not a 16-bit signed value available, and is greater
than the maximum 16-bit positive value (K32767), only the low 16 bits of the product will be
stored, and the carry flag M1022 will be ON. If the product of a 16-bit multiplication is not a
16-bit signed value available, and is less than the minimum 16-bit negative value (K-32768),
only the low 16 bits of the product will be stored, and the carry flag M1022 will be ON.
2. If users need a complete result of a 16-bit multiplication (a 32-bit value), they have to use
API22 MUL/MULP. Please refer to the explanation of API22 MUL/MULP for more information.
3. If the product of a 32-bit multiplication is not a 32-bit signed value available, and is greater
than the maximum 32-bit positive value (K2147483647), only the low 32 bits of the product will
be stored, and the carry flag M1022 will be ON. If the product of a 32-bit multiplication is not a
32-bit signed value available, and is less than the minimum 32-bit negative value
(K-2147483648), only the low 32 bits of the product will be stored, and the carry flag M1022
will be ON.
4. If users need a complete result of a 32-bit multiplication (a 64-bit value), they have to use
API22 DMUL/DMULP. Please refer to the explanation of API22 DMUL/DMULP for more
information.