<s>
The	O
Atmel	B-Device
AT89	I-Device
series	I-Device
is	O
an	O
Intel	O
8051-compatible	O
family	O
of	O
8	O
bit	O
microcontrollers	B-Architecture
( μCs	O
)	O
manufactured	O
by	O
the	O
Atmel	O
Corporation	O
.	O
</s>
<s>
Based	O
on	O
the	O
Intel	B-Architecture
8051	I-Architecture
core	O
,	O
the	O
AT89	O
series	O
remains	O
very	O
popular	O
as	O
general	O
purpose	O
microcontrollers	B-Architecture
,	O
due	O
to	O
their	O
industry	O
standard	O
instruction	O
set	O
,	O
their	O
low	O
unit	O
cost	O
,	O
and	O
the	O
availability	O
of	O
these	O
chips	O
in	O
DIL	O
(	O
DIP	O
)	O
packages	O
.	O
</s>
<s>
While	O
less	O
powerful	O
than	O
the	O
newer	O
AT90	O
series	O
of	O
AVR	B-Architecture
RISC	B-Architecture
microcontrollers	B-Architecture
,	O
new	O
product	O
development	O
has	O
continued	O
with	O
the	O
AT89	O
series	O
for	O
the	O
aforementioned	O
advantages	O
.	O
</s>
<s>
More	O
recently	O
,	O
the	O
AT89	O
series	O
has	O
been	O
augmented	O
with	O
8051-cored	O
special	O
function	O
microcontrollers	B-Architecture
,	O
specifically	O
in	O
the	O
areas	O
of	O
USB	B-Protocol
,	O
I²C	O
(	O
two	O
wire	O
interface	O
)	O
,	O
SPI	B-Architecture
and	O
CAN	B-Protocol
bus	I-Protocol
controllers	O
,	O
MP3	B-Application
decoders	O
and	O
hardware	O
PWM	B-Algorithm
.	O
</s>
<s>
The	O
alternate	O
functions	O
can	B-Protocol
only	O
be	O
activated	O
if	O
the	O
corresponding	O
bit	O
latch	O
in	O
the	O
port	O
SFR	O
contains	O
a	O
1	O
.	O
</s>
