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Before reading this page
read the one on LOGIC
GATES.
If you look at the truth
table for the OR gate
not only does the output
go high when A OR B are
high but it goes high
when A AND B together
are high.
This can cause problems
in some applications.
Therefore the EXCLUSIVE
OR or EXOR is used.
The output of the EXOR
only goes high when A or
B on its own goes high.
That is when A or B
exclusively goes high.
When A and B are both
high the output stays
low.
This is shown in the
truth table.
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