<s>
H8	O
is	O
the	O
name	O
of	O
a	O
large	O
family	O
of	O
8-bit	O
,	O
16-bit	B-Device
and	O
32-bit	O
microcontrollers	B-Architecture
made	O
by	O
Renesas	O
Technology	O
,	O
originating	O
in	O
the	O
early	O
1990s	O
within	O
Hitachi	O
Semiconductor	O
.	O
</s>
<s>
The	O
family	O
of	O
largely	O
CISC	O
machines	O
is	O
unrelated	O
to	O
the	O
higher-performance	O
SuperH	O
family	O
of	O
32-bit	O
RISC-like	O
microcontrollers	B-Architecture
.	O
</s>
<s>
It	O
was	O
supported	O
in	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
starting	O
with	O
version	O
4.2	O
but	O
support	O
was	O
removed	O
in	O
version	O
5.19	O
.	O
</s>
<s>
Subfamilies	O
include	O
the	O
8/16	O
-bit	O
H8/300	B-Device
and	O
H8/500	O
,	O
the	O
16/32	O
-bit	O
H8/300H	O
and	O
H8S	B-Device
and	O
the	O
32-bit	O
H8SX	B-Device
series	O
,	O
each	O
with	O
dozens	O
of	O
different	O
variants	O
,	O
varying	O
by	O
speed	O
,	O
selection	O
of	O
built-in	O
peripherals	O
such	O
as	O
timers	O
and	O
serial	B-Protocol
ports	I-Protocol
,	O
and	O
amounts	O
of	O
ROM	B-Device
,	O
flash	B-Device
memory	I-Device
and	O
RAM	B-Architecture
.	O
</s>
<s>
Built-in	O
ROM	B-Device
and	O
flash	B-Device
memory	I-Device
tends	O
to	O
range	O
from	O
16KB	O
to	O
1024KB	O
,	O
and	O
RAM	B-Architecture
from	O
512B	O
to	O
512KB	O
.	O
</s>
<s>
The	O
basic	O
architecture	O
of	O
the	O
H8	O
is	O
patterned	O
after	O
the	O
DEC	O
PDP-11	B-Device
architecture	I-Device
,	O
with	O
eight	O
16-bit	B-Device
registers	O
(	O
the	O
H8/300H	O
and	O
H8S	B-Device
have	O
an	O
additional	O
bank	O
of	O
eight	O
16-bit	B-Device
registers	O
)	O
,	O
and	O
a	O
variety	O
of	O
addressing	B-Language
modes	I-Language
.	O
</s>
<s>
Unlike	O
the	O
PDP-11	O
however	O
,	O
the	O
H8	O
architecture	O
employs	O
big-endian	O
byte	B-Application
ordering	O
.	O
</s>
<s>
Both	O
H8/300H	O
and	O
H8S	B-Device
have	O
eight	O
32-bit	O
registers	O
,	O
each	O
of	O
which	O
can	O
be	O
treated	O
as	O
one	O
32-bit	O
register	B-General_Concept
,	O
two	O
16-bit	B-Device
registers	O
,	O
or	O
two	O
8-bit	O
registers	O
,	O
with	O
the	O
H8S	B-Device
having	O
an	O
internal	O
32-bit	O
configuration	O
.	O
</s>
<s>
Several	O
companies	O
provide	O
compilers	B-Language
for	O
the	O
H8	B-Device
family	I-Device
,	O
and	O
there	O
is	O
a	O
complete	O
GCC	B-Application
port	O
,	O
including	O
a	O
simulator	B-Application
.	O
</s>
<s>
The	O
family	O
is	O
continued	O
with	O
the	O
H8SX	B-Device
32-bit	O
controllers	O
.	O
</s>
<s>
H8S	B-Device
may	O
be	O
found	O
in	O
digital	B-Device
cameras	I-Device
,	O
the	O
Cybiko	B-Application
handheld	O
computers	O
,	O
some	O
ThinkPad	B-Operating_System
notebooks	O
,	O
printer	O
controllers	O
,	O
smart	O
cards	O
,	O
chess	B-Application
computers	I-Application
,	O
music	O
synthesizers	O
and	O
in	O
various	O
automotive	O
subsystems	O
.	O
</s>
<s>
The	O
LEGO	O
Mindstorms	O
RCX	O
,	O
an	O
advanced	O
robot	O
toy/educational	O
tool	O
,	O
uses	O
the	O
H8/300	B-Device
.	O
</s>
<s>
Namco	O
employed	O
an	O
H8/3002	O
as	O
a	O
sound	O
processor	O
for	O
various	O
games	O
it	O
made	O
in	O
the	O
late	O
1990s	O
,	O
notably	O
those	O
using	O
its	O
System	B-Application
12	I-Application
architecture	O
.	O
</s>
