AutomationDirect DL205 - Page 316

DL205 User Manual, 4th Edition, Rev. D
5-92
Chapter 5: Standard RLL Instructions
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A
B
C
D
Subtract Double (SUBD)
Subtract Double is a 32-bit instruction that subtracts the
BCD value (Aaaa), which is either two consecutive V-memory
locations or an 8-digit (max) constant, from the BCD value in
the accumulator. The result resides in the accumulator.
NOTE: The 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 and V2001 will be loaded
into the accumulator using the Load Double instruction. The value in V2006 and V2007
is subtracted from the value in the accumulator. The value in the accumulator is copied to
V2010 and V2011 using the Out Double instruction.
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230
240
250-1
260
Operand Data Type DL230 Range DL240 Range DL250-1 Range DL260 Range
A aaa aaa aaa aaa
V-memory V All (See page 3 - 53) All (See page 3-54) All (See page 3-55) All (See page 3-56)
Pointer P -
All V-memory
(See page 3-54)
All V-memory
(See page 3-55)
All V-memory
(See page 3-56)
Constant K 0-99999999 0-99999999 0-99999999 0-99999999
Discrete Bit Flags Description
SP63 On when the result of the instruction causes the value in the accumulator to be zero
SP64 On when the 16 bit subtraction instruction results in a borrow
SP65 On when the 32 bit subtraction instruction results in a borrow
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
SUBD
A aaa
Direct
SOFT
Handheld Programmer Keystrokes
LDD
V2000
X1
Load the value in V2000 and
V2001 into the accumulator
SUBD
V2006
The value in V2006 and V2007
is subtracted from the value in
the accumulator
OUTD
V2010
Copy the value in the
accumulator to V2010 and
V2011
00390899
01063274
0 1 0 6 3 2
7 4
V2010
V2000V2001
V2011
00390899
672375
ACC.
STR
$
SHFT
SHFT
ANDST
L
3
D
3
D
3
D
OUT
GX
SHFT
3
D
RST
S
ISG
U
1
B
1
B
ENT
2
C
0
A
0
A
ENT
6
G
2
C
0
A
0
A
0
A
ENT
2
C
0
A
1
B
0
A
ENT
SHFT
_
DS Used
HPP Used