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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

Dest N7:42

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

Dest N7:44

COS