AutomationDirect DL205 - Page 339

DL205 User Manual, 4th Edition, Rev. D
5-115
Chapter 5: Standard RLL Instructions
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A
B
C
D
Multiply Top of Stack (MULS)
Multiply Top of Stack is a 16-bit instruction that multiplies a
4-digit BCD value in the first level of the accumulator stack by
a 4-digit BCD value in the accumulator. The result resides in
the accumulator. The value in the first level of the accumulator
stack is is removed, and all stack values 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 value in V1400 will be loaded into the accumulator
using the Load instruction. The value in V1420 is loaded into the accumulator using the Load
instruction, pushing the value previously loaded in the accumulator onto the accumulator
stack. The BCD value in the first level of the accumulator stack is multiplied by the BCD
value in the accumulator using the Multiply Stack instruction. The value in the accumulator
is copied to V1500 and V1501 using the Out Double instruction.




230
240
250-1
260
MULS
LD
V1400
X1
Load thevalue in V1400 into
theaccumulator
LD
V1420
Load thevalue in V1420 into
theaccumulator
OUTD
V1500
Copy thevalue in the
accumulatortoV1500
and V1501
XXXX
XXXX
Level 1
XXXX
XXXX
Level 2
XXXX
XXXX
Level 3
XXXX
XXXX
Level 4
XXXX
XXXX
Level 5
XXXX
XXXX
Level 6
XXXX
XXXX
Level 7
XXXX
XXXX
Level 8
00005
000
Level 1
XXXX
XXXX
Level 2
XXXX
XXXX
Level 3
XXXX
XXXX
Level 4
XXXX
XXXX
Level 5
XXXX
XXXX
Level 6
XXXX
XXXX
Level 7
XXXX
XXXX
Level 8
MULS
Multiply thevalue in
theaccumulator withthe
valueinthe firstlevel
of theaccumulatorstack
Acc.
V1400
5000
0000 5 000
Acc.
V1420
0200
0000 0200
Accumulatorstack
after1st LDD
Accumulatorstack
after 2nd LDD
Acc.
0100 0000
0100 0000
V1500V1501
The unused accumulator
bits areset to zero
The unused accumulator
bits areset 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
RST
S
ENT
DirectSOFT
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
SP75 On when a BCD instruction is executed and a NON-BCD number was encountered
DS Used
HPP Used