Publication 1747-RM001G-EN-P - November 2008
4-30 Math Instructions
Arc Tangent (ATN)
Use the ATN instruction to take the arc tangent of a number (source) and
store the result (in radians) in the destination. The resulting value in the
destination is always greater than or equal to -Pi/2 and less than or equal to
Pi/2, where Pi = 3.141592. Use this instruction with SLC 5/03 (OS302), SLC
5/04 (OS401), and SLC 5/05 processors.
Updates to Arithmetic Status Bits
The arithmetic status bits are found in Word 0, bits 0 to 3 in the status file.
After an instruction is executed, the arithmetic status bits in the status file are
updated.
Cosine (COS)
Use the COS instruction to take the cosine of a number (source in radians) and
store the result in the destination. The source must be greater than or equal to
-205887.4 and less than or equal to 205887.4. The greatest accuracy is achieved
when the source is greater than -2 Pi and less than 2 Pi, where Pi = 3.141592.
The resulting value in the destination is always greater than or equal to -1 and
less than or equal to 1. Use this instruction with SLC 5/03 (OS302), SLC 5/04
(OS401), and SLC 5/05 processors.
Updates to Arithmetic Status Bits
The arithmetic status bits are found in Word 0, bits 0 to 3 in the status file.
After an instruction is executed, the arithmetic status bits in the status file are
updated.
ATN
Arc Tangent
Source N7:41
0<
Dest N7:42
0<
ATN
Output Instruction
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
•••
Table 4.19 Processor Function
With this Bit The Processor
S:0/0 Carry (C) always resets.
S:0/1 Overflow
(V)
sets if an overflow is generated or an unsupported input is
detected; otherwise resets.
S:0/2 Zero (Z) sets if the result is zero; otherwise resets.
S:0/3 Sign (S) sets if the result is negative; otherwise resets.
COS
Cosine
Source N7:43
0<
Dest N7:44
0<
COS
Output Instruction
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
•••
Table 4.20 Processor Function
With this Bit The Processor
S:0/0 Carry (C) always resets.
S:0/1 Overflow (V) sets if an overflow is generated or an unsupported input is
detected; otherwise resets.
S:0/2 Zero (Z) sets if the result is zero; otherwise resets.
S:0/3 Sign (S sets if the result is negative; otherwise resets.
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