DL205 User Manual, 4th Edition, Rev. B
5–91
Chapter 5: Standard RLL Instructions - Math
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A
B
C
D
Subtract (SUB)
Subtract is a 16-bit instruction that subtracts the BCD
value (Aaaa) in a V-memory location from the BCD value
in the lower 16 bits of the accumulator. The result resides
in the accumulator.
NOTE:
A constant (K) cannot be used for the BCD value.
Status flags are only valid until another instruction that uses the same flags is executed.
In the following example, when X1 is on, the value in V2000 will be loaded into the
accumulator using the Load instruction. The value in V2006 is subtracted from the value in
the accumulator using the Subtract instruction. The value in the accumulator is copied to
V2010 using the Out instruction.
þ
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230
240
250-1
260
Sta
nd
ard
R
LL
I
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s
tr
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io
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5–91
S
UB
A
aaa
Operand Data Type
DL230 Range
DL240 Range DL250-1 Range DL260 Range
A
aaa
aaa
aaa
aaa
V-memory V
All
See memory map
All
See memory map
All
See memory map
All
See memory map
Pointer P
-
All V-memory.
See memory map
All V-memory.
See memory map
All V-memory.
See memory map
Discrete Bit Flags
Description
SP63
On when the result of the instruction causes the value in the accumulator to be zero
SP66
On when the 16 bit addition instruction results in a carry
SP67
On when the 32 bit addition instruction results in a carry
SP70
On anytime the value in the accumulator is negative
SP75
On when a BCD instruction is executed and a NON-BCD number is encountered
Direct
SOFT
Handheld Programmer Keystrokes
LD
V2000
X1
Load the value in V2000 into
the lower 16 bits of the
accumulator
SUB
V2006
Subtract the value in V2006
from the value in the lower
16 bits of the accumulator
OUT
V2010
Copy the value in the lower
16 bits of the accumulator to
V2010
V2010
0
2
1
(V2006)
(Accumulator)
2
0
0
V2000
4 7 5
8 8 3
0 0 0
4 7 5
5 9 2
Acc.
8 8 3
The unused accumulator
bits are set to zero
SHFT
ANDST
L
3
D
STR
$
SHFT
SHFT
AND
V
2
C
0
A
0
A
ENT
6
G
OUT
GX
SHFT
AND
V
2
C
0
A
1
B
0
A
ENT
RST
S
ISG
U
1
B
1
B
ENT
2
C
0
A
0
A
0
A
ENT
_
DS
Used
HPP Used
