<s>
The	O
68HC05	B-Device
(	O
HC05	B-Device
in	O
short	O
)	O
is	O
a	O
broad	O
family	O
of	O
8-bit	O
microcontrollers	B-Architecture
from	O
Freescale	O
Semiconductor	O
(	O
formerly	O
Motorola	O
Semiconductor	O
)	O
.	O
</s>
<s>
Like	O
all	O
Motorola	O
processors	O
that	O
share	O
lineage	O
from	O
the	O
6800	B-Device
,	O
they	O
use	O
the	O
von	B-Architecture
Neumann	I-Architecture
architecture	I-Architecture
as	O
well	O
as	O
memory-mapped	O
I/O	O
.	O
</s>
<s>
This	O
family	O
has	O
five	O
CPU	B-General_Concept
registers	I-General_Concept
that	O
are	O
not	O
part	O
of	O
the	O
memory	O
:	O
an	O
8-bit	O
accumulator	B-General_Concept
A	O
,	O
an	O
8-bit	O
index	B-General_Concept
register	I-General_Concept
X	O
,	O
an	O
8-bit	O
stack	O
pointer	O
SP	O
with	O
two	O
most	O
significant	O
bits	O
hardwired	O
to	O
1	O
,	O
a	O
13-bit	O
program	B-General_Concept
counter	I-General_Concept
PC	O
,	O
and	O
an	O
8-bit	O
condition	B-General_Concept
code	I-General_Concept
register	I-General_Concept
CCR	O
.	O
</s>
<s>
Among	O
the	O
HC05	B-Device
's	O
there	O
are	O
several	O
processor	O
families	O
,	O
each	O
targeted	O
to	O
different	O
embedded	O
applications	O
.	O
</s>
<s>
The	O
68HC05	B-Device
family	O
broke	O
ground	O
with	O
the	O
introduction	O
of	O
the	O
EEPROM-based	O
MC68HC805C4	O
and	O
MC68HC805B6	O
variants	O
in	O
the	O
late	O
1980s	O
.	O
</s>
<s>
The	O
HC05	B-Device
series	O
is	O
now	O
considered	O
legacy	O
and	O
is	O
replaced	O
by	O
the	O
HC(S )	O
08	O
MCU	O
series	O
.	O
</s>
<s>
MC6805xx	O
Motorola	O
's	O
first	O
microcontroller	B-Architecture
family	O
,	O
implemented	O
in	O
HMOS	O
.	O
</s>
