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Floating-point Math Instructions
Section 3-15
Description
ACOS(464) computes the angle (in radians) for a cosine value expressed as a
32-bit floating-point number in S+1 and S and places the result in R+1 and R.
(The floating point source data must be in IEEE754 format.)
The source data must be between –1.0 and 1.0. If the absolute value of the
source data exceeds 1.0, an error will occur and the instruction will not be
executed.
The result is output to words R+1 and R as an angle (in radians) within the
range of 0 to
π
.
The following diagram shows the relationship between the input data and
result.
Flags
Precautions
The source data in S+1 and S must be in IEEE754 floating-point data format.
Index Registers
---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area
S
R
R+1
R
S
S+1
COS
–1
Source (32-bit floating-point data)
Result (32-bit floating-point data)
R
S: Input data (cosine value)
R: Result (radians)
Name
Label
Operation
Error Flag
ER
ON if the source data is not recognized as floating-point
data.
ON if the source data is not a number (NaN).
ON if the absolute value of the source data exceeds 1.0.
OFF in all other cases.
Equals Flag
=
ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
Overflow Flag
OF
OFF
Underflow Flag
UF
OFF
Negative Flag
N
ON if the result is negative.
OFF in all other cases.
Summary of Contents for SYSMAC CS1D-CPU**
Page 3: ...iv...
Page 29: ...xxx...
Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...