User guide

A–B

Chapter

20–1

Math Instructions

This chapter covers output instructions that allow you to perform

computation and math operations on individual words.

Instructions for use with fixed, SLC 5/01, and SLC 5/02 processors:

• Add (ADD)

• Subtract (SUB)

• Multiply (MUL)

• Divide (DIV)

• Double Divide (DDV)

• Negate (NEG)

• Clear (CLR)

• Convert to BCD (TOD)

• Convert from BCD (FRD)

• Decode (DCD)

Instructions for use with SLC 5/02 processors only:

• Square Root (SQR)

• Scale (SCL)

Application techniques possible with Series C and later SLC 5/02 processors:

• 32-bit addition and subtraction

All application examples shown are in the HHT zoom display.

The following general information applies to math instructions.

Entering Parameters

• Source – address(es) of the value(s) on which the mathematical, logical,

or move operation is to be performed; can be word addresses or program

constants. An instruction that has two source operands will not accept

program constants in both operands.

• Destination – the address (destination) of the result of the operation.

Signed integers are stored in two’s complementary form. Refer to appendix

B for more information regarding two’s complement form.

Math Instructions Overview