Exclusive Or (Xor) - Allen-Bradley MicroLogix 1000 User Manual

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MicroLogix 1000 Programmable Controllers User Manual
Preface

Exclusive Or (XOR)

The value at source A is Exclusive ORed bit by bit with the value at source B and
XOR
BITWISE EXCLUS OR
Source A then stored in the destination.
Source B
Dest
Truth Table
Execution Times
(µsec) when:
True False
33.64 6.92
Source A and B can either be a word address or a constant; however, both sources
cannot be a constant. The destination must be a word address.
Updates to Arithmetic Status Bits
S:0/0
S:0/1
S:0/2
S:0/3
9–20
Dest = A XOR B
A B Dest
0 0 0
1 0 1
0 1 1
1 1 0
With this Bit:
Carry (C)
Overflow (V)
Zero (Z)
Sign (S)
The Controller:
always resets.
always resets.
sets if result is zero; otherwise resets
sets if result is negative (most significant bit is set); otherwise
resets.