372
Symbol Math Instructions Section 3-10
Description *L(421) multiplies the signed binary values in Md and Md+1 and Mr and Mr+1
and outputs the result to R, R+1, R+2, and R+3.
Flags
Precautions When *L(421) is executed, the Error Flag will turn OFF.
If as a result of the multiplication, the content of R, R+1, R+2, R+3 is 0000
hex, the Equals Flag will turn ON.
If as a result of the multiplication, the content of the leftmost bit of R+1 is 1,
the Negative Flag will turn ON.
Examples When CIO 0.01 is ON in the following example, D201, D200 and D211, D210
will be multiplied as 8-digit signed hexadecimal values and the result will be
output to D220 to D223.
3-10-19 UNSIGNED BINARY MULTIPLY: *U(422)
Purpose Multiplies 4-digit unsigned hexadecimal data and/or constants.
Ladder Symbol
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area Md Mr R
R + 1 RR + 3 R + 2
×
Md + 1 Md
Mr + 1 Mr
(Signed binary)
(Signed binary)
(Signed binary)
Name Label Operation
Error Flag ER OFF
Equals Flag = ON when the result is 0.
OFF in all other cases.
Negative Flag N ON when the leftmost bit of the result is 1.
OFF in all other cases.
0.01
D200
D210
D220
*U(422)
R
Md
Mr
Md: Multiplicand word
Mr: Multiplier word
R: Result word
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