Omron CVM1D, Руководство по эксплуатации

Страница: 278 / 468

273
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.
Md + 1 Md
Mr + 1 Mr
R + 1 R R + 3 R + 2
x
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.
Md
Mr
R +1 R
X
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.
Md + 1 Md
Mr + 1 Mr
R + 1 R R + 3 R + 2
x
Precautions Refer to page 101 for general precautions on operand data areas.
Flags 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.”
Example
*
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.
Symbol Math Instructions
Section 5-20