Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 704

Double-precision Floating-point Instructions (CS1-H, CJ1-H, CJ1M, or CS1D Only)
Description
Note
664
Area
Indirect DM/EM
addresses in BCD
Constants
Data Registers
Index Registers
Indirect addressing
using Index Registers
+D(845) adds the double-precision (64-bit) floating-point number in words Ad
to Ad+3 the double-precision (64-bit) floating-point number in words Au to
Au+3 and places the result in words D to D+3. (The floating point data must
be in IEEE754 format.)
S1+3CH S1+2CH
S2+3CH S2+2CH
+
D+3CH D+2CH
If the absolute value of the result is greater than the maximum value that can
be expressed as floating-point data, the Overflow Flag will turn ON and the
result will be output as
If the absolute value of the result is less than the minimum value that can be
expressed as floating-point data, the Underflow Flag will turn ON and the
result will be output as 0.
The various combinations of augend and addend data will produce the results
shown in the following table.
Addend 0
0 0
Numeral Numeral
+ +
– –
NaN
1. The results could be zero (including underflows), a numeral, + , or – .
2. The Error Flag will be turned ON and the instruction will not be executed.
Au
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
---
---
---
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
S1+1CH S1CH
Augend (floating-point data, 64-bits)
S2+1CH S2CH
Addend (floating-point data, 64-bits)
D+1CH DCH
Result (floating-point data, 64-bits)
.
Augend
Numeral +
Numeral +
See note 1. +
+ +
– See note 2.
Section 3-16
Ad D
– NaN
–
–
See note 2.
–
See note 2.