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XOR Instruction UM018809-0611

188

ZNEO

CPU Core

User Manual

XOR

Definition

Logical Exclusive OR

Syntax

XOR dst, src

Operation

dst dst XOR src

Description

The source operand value is logically exclusive-ORed with the destination operand. An XOR

operation stores a 1 in a destination operand bit when the original destination bit differs from the

corresponding source operand bit; otherwise XOR stores a 0. The contents of the source operand

are unaffected. Table 23 summarizes the XOR operation.

Flags

Table 23. Truth Table for XOR

dst src Result (dst)

00 0

10 1

01 1

11 0

76543210

C Z S V B CIRQE IRQE

–**0*–––

Legend

Z = Set to 1 if the result is zero; otherwise, set to 0.

S = Set to 1 if the result msb is 1; otherwise set to 0.

V = Cleared to 0.

B = Set to 1 if the initial destination or source value is 0; otherwise set to 0.

CIRQE = No change.

IRQE = No change.

1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 215 216

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