Omron SYSMAC CV Series Operation Manual page 298

Symbol Math Instructions
Precautions
Flags
Example
286
DOUBLE SIGNED BINARY MULTIPLY
When the execution condition is OFF, *L(421) is not executed. When the execu-
tion condition is ON, *L(421) multiplies the signed 8-digit content of Md and
Md+1 by the signed content of Mr and Mr+1, and places the result in R to R+3.
x
R + 3 R + 2
UNSIGNED BINARY MULTIPLY
When the execution condition is OFF, *U(422) is not executed. When the execu-
tion condition is ON, *U(422) multiplies the unsigned content of Md by the un-
signed content of Mr, places the rightmost four digits of the result in R, and
places the leftmost four digits in R+1.
X
R +1
DOUBLE UNSIGNED BINARY MULTIPLY
When the execution condition is OFF, *UL(423) is not executed. When the
execution condition is ON, *UL(423) multiplies the unsigned 8-digit content of
Md and Md+1 by the unsigned content of Mr and Mr+1, and places the result in R
to R+3.
x
R + 3 R + 2
Refer to page 115 for general precautions on operand data areas.
ER (A50003): The content of a*DM word is not BCD when set for BCD.
EQ(A50006) The multiplication result is all zeroes.
N (A50008) The leftmost bit (MSB) of word R+1 (or word R+3 for
"double" instructions) after the multiplication is "1."
*L Operation
When CIO 000000 is ON in the following example, the content of D00101 and
D00100 are multiplied by the content of D00111 and D00110, in eight-digit binary
with sign, and the result is output to D00123 through D00120.
Md + 1 Md
Mr + 1 Mr
R + 1 R
Md
Mr
R
Md + 1 Md
Mr + 1 Mr
R + 1 R
Section 5-20