DL205 User Manual, 4th Edition, Rev. B
5–90
Chapter 5: Standard RLL Instructions - Math
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
Add Real (ADDR)
Add Real is a 32-bit instruction that adds a real number, which is
either two consecutive V-memory locations or a 32-bit constant,
to a real number in the accumulator. Both numbers must
conform to the IEEE floating point format. The result is a 32-bit
real number that resides in the accumulator.
NOTE:
Status flags are valid only until another instruction uses the same flag.
NOTE
1
:
The current HPP does not support real number entry with automatic conversion to the 32-bit IEEE
format. You must use
Direct
SOFT for this feature.
NOTE
2
:
If the value being added to a real number is 16,777,216 times smaller than the real number, the
calculation will not work.
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.
SP71
On anytime the V-memory specified by a pointer (P) is not valid.
SP72
On anytime the value in the accumulator is an invalid floating point number.
SP73
On when a signed addition or subtraction results in a incorrect sign bit.
SP74
On anytime a floating point math operation results in an underflow error.
SP75
On when a real number instruction is executed and a non-real number was encountered.
A
DD
R
A
aaa
A
DD
R
A
aaa
ý
ý
þ
þ
230
240
2
5
0
-1
2
6
0
LDR
R7.0
X1
Load the real number 7.0
into the accumulator
ADDR
R15.0
Add the real number 15.0 to
the accumulator contents,
which is in real number
format.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
0
1
1
0
0
0
0
8
4
2
1
8
4
2
1
8
4
2
1
8
4
2
1
8
4
2
1
8
4
2
1
8
4
2
1
8
4
2
1
Acc.
4
1
B
0
0
0
0
0
V1400
V1401
Real Value
Copy the result in the accumulator
to V1400 and V1401.
OUTD
V1400
Implies 2 (exp 4)
131 -- 127 = 4
(Hex number)
Mantissa (23 bits)
Sign Bit
4
0
E
0
0
0
0
0
0
0
0
0
4
0
E
0
(ADDR)
(Accumulator)
4
1
7
0
0
0
0
0
+
0
0
0
0
4
1
B
0
Acc.
7
(decimal)
+
1
5
2
2
1.011 x 2 (exp 4) = 10110. binary= 22 decimal
128 + 2 + 1 = 131
Exponent (8 bits)
Direct
SOFT
Operand Data Type
DL250-1 Range
DL260 Range
A
aaa
aaa
V-memory V
All. See
memory map
All. See
memory map
Pointer P
All V-memory.
See memory map
All V-memory.
See memory map
Constant R
-3.038 to
+ 3.038
-3.038 to
+ 3.038
DS
Used
HPP
N/A
