Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 729

Double-precision Floating-point Instructions (CS1-H, CJ1-H, CJ1M, or CS1D Only)
Description
Area
Indirect DM/EM
addresses in binary
Indirect DM/EM
addresses in BCD
Constants
Data Registers
Index Registers
Indirect addressing
using Index Registers
EXPD(858) calculates the natural (base e) exponential of the double-precision
(64-bit) floating-point number in words S to S+3 and places the result in words
D to D+3. In other words, EXP(467) calculates e
result in words D to D+3.
S+3
e
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.
Note The constant e is 2.718282.
The following diagram shows the relationship between the input data and
result.
S
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
*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
S+2 S+1 S
D+3
.
R
Section 3-16
D
x
(x = source) and places the
D+2 D+1 D
S: Input data
R: Result
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