Automationdirect.com DirectLOGIC DL205 Series, User Manual

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DL205 User Manual, 4th Edition, Rev. B
5–119
Chapter 5: Standard RLL Instructions - Math
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A
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Multiply Binary Top of Stack (MULBS)
Multiply Binary Top of Stack is a 16-bit instruction that
multiplies the 16-bit binary value in the first level of the
accumulator stack by the 16-bit binary value in the
accumulator. The result resides in the accumulator and can be
32 bits (8 digits max.). The value in the first level of the
accumulator stack is removed and all stack locations are
moved up one level.
NOTE: Status flags are valid only until another instruction uses the same flag.
In the following example, when X1 is on, the Load instruction moves the value in V1400 into
the accumulator. The value in V1420 is loaded into the accumulator using the Load
instruction, pushing the value previously loaded in the accumulator onto the stack. The
binary value in the accumulator stack’s first level is multiplied by the binary value in the
accumulator using the Multiply Binary Stack instruction. The Out Double instruction copies
the value in the accumulator to V1500 and V1501.
ý
ý
ý
þ
230
240
2 5 0 -1
2 6 0
M U L B S
Discrete Bit Flags Description
SP63 On when the result of the instruction causes the value in the accumulator to be zero.
SP70 On anytime the value in the accumulator is negative.
LD
V1400
X1 Load the value in V1400 into
the accumulator
LD
V1420
Load the value in V1420 into
the accumulator
OUTD
V1500
Copy the value in the
accumulator to V1500
and V1501
X X X X X X X X Level 1
X X X X X X X X Level 2
X X X X X X X X Level 3
X X X X X X X X Level 4
X X X X X X X X Level 5
X X X X X X X X Level 6
X X X X X X X X Level 7
X X X X X X X X Level 8
0 0 0 0 C 3 5 0 Level 1
X X X X X X X X
Level 2
X X X X X X X X Level 3
X X X X X X X X Level 4
X X X X X X X X Level 5
X X X X X X X X
Level 6
X X X X X X X X Level 7
X X X X X X X X
Level 8
MULBS
Multiply the binary value in
the accumulator with the
binary value in the first level
of the accumulator stack
Acc.
V1400
C 3 5 0
0 0 0 0 C 3 5 0
Acc.
V1420
0 0 1 4
0 0 0 0 0 0 1 4
Accumulator stack
after 1st LDD
Accumulator stack
after 2nd LDD
Acc. 0 0 0 F
4 2 4 0
0 0 0 F 4 2 4 0
V1500 V1501
The unused accumulator
bits are set to zero
The unused accumulator
bits are set to zero
Handheld Programmer Keystrokes
SHFT
ANDST
L
3
D
STR
$
SHFT
ORST
M
ISG
U
ANDST
L
OUT
GX
SHFT
3
D
1
B
5
F
0
A
0
A
ENT
1
B
ENT
1
B
4
E
0
A
0
A
ENT
ENT
SHFT
ANDST
L
3
D
1
B
4
E
2
C
0
A
1
B
RST
S
ENT
Direct SOFT
DS Used
HPP Used