<s>
A	O
Device	B-General_Concept
Register	I-General_Concept
is	O
the	O
view	O
any	O
device	O
presents	O
to	O
a	O
programmer	B-Application
.	O
</s>
<s>
Each	O
programmable	O
bit	O
in	O
the	O
device	O
is	O
presented	O
with	O
a	O
logical	B-General_Concept
address	I-General_Concept
and	O
it	O
appears	O
as	O
a	O
part	O
of	O
a	O
byte	B-Application
in	O
the	O
device	B-General_Concept
registers	I-General_Concept
.	O
</s>
<s>
Then	O
programming	O
of	O
these	O
bits	O
can	O
be	O
achieved	O
by	O
reading	O
from	O
or	O
writing	O
to	O
these	O
device	B-General_Concept
registers	I-General_Concept
.	O
</s>
<s>
Most	O
devices	O
have	O
at	O
least	O
these	O
two	O
device	B-General_Concept
registers	I-General_Concept
:	O
</s>
