Technical Data
MC68HC908GR8A — Rev 0.0
155
Central Processing Unit (CPU)
MOTOROLA
Central Processing Unit (CPU)
B
it
M
a
n
ip
u
la
ti
o
n
B
ran
ch
R
ead
-M
o
d
if
y-W
ri
te
C
o
n
tr
o
l
R
e
g
ister
/M
emo
ry
D
IR
D
IR
RE
L
D
IR
IN
H
INH
IX
1
S
P
1
IX
IN
H
INH
M
D
IR
E
X
T
IX
2
S
P
2
IX
1
S
P
1
IX
0
1
23
45
6
9
E
6
78
9
A
B
C
D
9
E
D
E
9
E
F
0
5
BR
SET
0
3D
IR
4
BSET
0
2D
IR
3
BR
A
2R
E
L
4
NE
G
2D
IR
1
NE
G
A
1I
N
H
1
NE
G
X
1I
N
H
4
NE
G
2I
X
1
5
NE
G
3
SP1
3
NE
G
1I
X
7
RTI
1I
N
H
3
BGE
2R
E
L
2
SU
B
2I
M
3
SU
B
2D
IR
4
SU
B
3
EXT
4
SU
B
3I
X
2
5
SU
B
4
SP2
3
SU
B
2I
X
1
4
SU
B
3
SP1
2
SU
B
1I
X
1
5
BR
C
L
R
0
3D
IR
4
BC
LR
0
2D
IR
3
BR
N
2R
E
L
5
C
BEQ
3D
IR
4
C
BEQA
3I
M
4
C
BEQX
3I
M
5
C
BEQ
3I
X
1
+
6
C
BEQ
4
SP1
4
C
BEQ
2I
X
+
4
RT
S
1I
N
H
3
BL
T
2R
E
L
2
CM
P
2I
M
3
CM
P
2D
IR
4
CM
P
3
EXT
4
CM
P
3I
X
2
5
CM
P
4
SP2
3
CM
P
2I
X
1
4
CM
P
3
SP1
2
CM
P
1I
X
2
5
BR
SET
1
3D
IR
4
BSET
1
2D
IR
3
BH
I
2R
E
L
5
MU
L
1I
N
H
7
DIV
1I
N
H
3
NS
A
1I
N
H
2
DA
A
1I
N
H
3
BG
T
2R
E
L
2
SBC
2I
M
3
SB
C
2D
IR
4
SBC
3
EXT
4
SBC
3I
X
2
5
SBC
4
SP2
3
SBC
2I
X
1
4
SBC
3
SP1
2
SBC
1I
X
3
5
BR
C
L
R
1
3D
IR
4
BC
LR
1
2D
IR
3
BLS
2R
E
L
4
CO
M
2D
IR
1
CO
M
A
1I
N
H
1
CO
MX
1I
N
H
4
CO
M
2I
X
1
5
CO
M
3
SP1
3
CO
M
1I
X
9
SW
I
1I
N
H
3
BLE
2R
E
L
2
CP
X
2I
M
3
CP
X
2D
IR
4
CP
X
3
EXT
4
CP
X
3I
X
2
5
CP
X
4
SP2
3
CP
X
2I
X
1
4
CP
X
3
SP1
2
CP
X
1I
X
4
5
BR
SET
2
3D
IR
4
BSET
2
2D
IR
3
BC
C
2R
E
L
4
LSR
2D
IR
1
LSR
A
1I
N
H
1
LSR
X
1I
N
H
4
LSR
2I
X
1
5
LSR
3
SP1
3
LSR
1I
X
2
TA
P
1I
N
H
2
TX
S
1I
N
H
2
AN
D
2I
M
3
AN
D
2D
IR
4
AN
D
3
EXT
4
AN
D
3I
X
2
5
AN
D
4
SP2
3
AN
D
2I
X
1
4
AN
D
3
SP1
2
AN
D
1I
X
5
5
BR
C
L
R
2
3D
IR
4
BC
LR
2
2D
IR
3
BC
S
2R
E
L
4
ST
H
X
2D
IR
3
L
DHX
3I
M
4
LD
H
X
2D
IR
3
CP
H
X
3I
M
4
CP
H
X
2D
IR
1
TP
A
1I
N
H
2
TS
X
1I
N
H
2
BI
T
2I
M
3
BI
T
2D
IR
4
BI
T
3
EXT
4
BI
T
3I
X
2
5
BI
T
4
SP2
3
BI
T
2I
X
1
4
BI
T
3
SP1
2
BI
T
1I
X
6
5
BR
SET
3
3D
IR
4
BSET
3
2D
IR
3
BN
E
2R
E
L
4
RO
R
2D
IR
1
RO
RA
1I
N
H
1
RO
RX
1I
N
H
4
RO
R
2I
X
1
5
RO
R
3
SP1
3
RO
R
1I
X
2
PU
LA
1I
N
H
2
LD
A
2I
M
3
LD
A
2D
IR
4
LD
A
3
EXT
4
LD
A
3I
X
2
5
LD
A
4
SP2
3
LD
A
2I
X
1
4
LD
A
3
SP1
2
LD
A
1I
X
7
5
BR
C
L
R
3
3D
IR
4
BC
LR
3
2D
IR
3
BEQ
2R
E
L
4
ASR
2D
IR
1
ASR
A
1I
N
H
1
ASR
X
1I
N
H
4
ASR
2I
X
1
5
ASR
3
SP1
3
ASR
1I
X
2
PSH
A
1I
N
H
1
TA
X
1I
N
H
2
AI
S
2I
M
3
ST
A
2D
IR
4
ST
A
3
EXT
4
ST
A
3I
X
2
5
ST
A
4
SP2
3
ST
A
2I
X
1
4
ST
A
3
SP1
2
ST
A
1I
X
8
5
BR
SET
4
3D
IR
4
BSET
4
2D
IR
3
BH
C
2R
E
L
4
LSL
2D
IR
1
LSL
A
1I
N
H
1
LSLX
1I
N
H
4
LS
L
2I
X
1
5
LSL
3
SP1
3
LSL
1I
X
2
PU
LX
1I
N
H
1
CL
C
1I
N
H
2
EOR
2I
M
3
EOR
2D
IR
4
EO
R
3
EXT
4
EOR
3I
X
2
5
EOR
4
SP2
3
EOR
2I
X
1
4
EOR
3
SP1
2
EOR
1I
X
9
5
BR
C
L
R
4
3D
IR
4
BC
LR
4
2D
IR
3
BH
C
S
2R
E
L
4
RO
L
2D
IR
1
RO
L
A
1I
N
H
1
RO
L
X
1I
N
H
4
RO
L
2I
X
1
5
RO
L
3
SP1
3
RO
L
1I
X
2
PSH
X
1I
N
H
1
SEC
1I
N
H
2
AD
C
2I
M
3
AD
C
2D
IR
4
AD
C
3
EXT
4
AD
C
3I
X
2
5
AD
C
4
SP2
3
AD
C
2I
X
1
4
AD
C
3
SP1
2
AD
C
1I
X
A
5
BR
SET
5
3D
IR
4
BSET
5
2D
IR
3
BPL
2R
E
L
4
DE
C
2D
IR
1
DE
C
A
1I
N
H
1
DE
CX
1I
N
H
4
DE
C
2I
X
1
5
DE
C
3
SP1
3
DE
C
1I
X
2
PU
LH
1I
N
H
2
CL
I
1I
N
H
2
OR
A
2I
M
3
OR
A
2D
IR
4
OR
A
3
EXT
4
OR
A
3I
X
2
5
OR
A
4
SP2
3
OR
A
2I
X
1
4
OR
A
3
SP1
2
OR
A
1I
X
B
5
BR
C
L
R
5
3D
IR
4
BC
LR
5
2D
IR
3
BM
I
2R
E
L
5
DB
N
Z
3D
IR
3
DB
N
Z
A
2I
N
H
3
DB
N
Z
X
2I
N
H
5
DB
N
Z
3I
X
1
6
DB
N
Z
4
SP1
4
DB
N
Z
2I
X
2
PSH
H
1I
N
H
2
SEI
1I
N
H
2
AD
D
2I
M
3
AD
D
2D
IR
4
AD
D
3
EXT
4
AD
D
3I
X
2
5
AD
D
4
SP2
3
AD
D
2I
X
1
4
AD
D
3
SP1
2
AD
D
1I
X
C
5
BR
SET
6
3D
IR
4
BSET
6
2D
IR
3
BM
C
2R
E
L
4
IN
C
2D
IR
1
IN
CA
1I
N
H
1
IN
CX
1I
N
H
4
IN
C
2I
X
1
5
IN
C
3
SP1
3
IN
C
1I
X
1
CL
R
H
1I
N
H
1
RS
P
1I
N
H
2
JM
P
2D
IR
3
JM
P
3
EXT
4
JM
P
3I
X
2
3
JM
P
2I
X
1
2
JM
P
1I
X
D
5
BR
C
L
R
6
3D
IR
4
BC
LR
6
2D
IR
3
BM
S
2R
E
L
3
TS
T
2D
IR
1
TS
T
A
1I
N
H
1
TS
TX
1I
N
H
3
TS
T
2I
X
1
4
TS
T
3
SP1
2
TS
T
1I
X
1
NO
P
1I
N
H
4
BSR
2R
E
L
4
JS
R
2D
IR
5
JS
R
3
EXT
6
JS
R
3I
X
2
5
JS
R
2I
X
1
4
JS
R
1I
X
E
5
BR
SET
7
3D
IR
4
BSET
7
2D
IR
3
BI
L
2R
E
L
5
MO
V
3D
D
4
MO
V
2D
IX
+
4
MO
V
3I
M
D
4
MO
V
2I
X
+
D
1
ST
OP
1I
N
H
*
2
LD
X
2I
M
3
LD
X
2D
IR
4
LD
X
3
EXT
4
LD
X
3I
X
2
5
LD
X
4
SP2
3
LD
X
2I
X
1
4
LD
X
3
SP1
2
LD
X
1I
X
F
5
BR
C
L
R
7
3D
IR
4
BC
LR
7
2D
IR
3
BI
H
2R
E
L
3
CL
R
2D
IR
1
CL
RA
1I
N
H
1
CL
RX
1I
N
H
3
CL
R
2I
X
1
4
CL
R
3
SP1
2
CL
R
1I
X
1
WA
IT
1I
N
H
1
TX
A
1I
N
H
2
AI
X
2I
M
3
ST
X
2D
IR
4
ST
X
3
EXT
4
ST
X
3I
X
2
5
ST
X
4
SP2
3
ST
X
2I
X
1
4
ST
X
3
SP1
2
ST
X
1I
X
IN
H
Inherent
R
E
L
R
elat
iv
e
SP1
S
tac
k
Point
e
r,
8-Bit
Of
fs
et
IM
M
Im
m
ediat
e
IX
Index
ed,
N
o
Of
fs
et
SP2
S
tac
k
Point
e
r,
16-Bit
Of
fs
e
t
D
IR
D
irec
t
IX1
Index
ed,
8-Bit
Of
fs
et
IX+
Ind
ex
ed,
N
o
Of
fs
et
w
it
h
EXT
Ex
tended
IX2
Index
ed,
16-Bit
Of
fs
et
Pos
tI
n
c
rem
ent
D
irec
t-D
irec
t
IM
D
Im
m
ediat
e-D
irec
t
IX
1
+
In
d
e
x
ed,
1-By
te
Of
fs
et
w
it
h
IX+
D
Index
ed-D
irec
t
D
IX+
D
irec
t-I
ndex
ed
Pos
tI
n
c
rem
ent
*Pre-by
te
fo
rs
tac
k
point
er
index
ed
ins
truc
tions
0
H
igh
By
te
of
O
p
c
o
de
in
H
e
x
a
dec
im
a
l
Low
By
te
of
Opc
ode
in
H
e
x
a
dec
im
al
0
5
BR
SET
0
3D
IR
Cy
cl
e
s
Opc
o
de
M
n
em
onic
N
u
m
ber
of
By
te
s
/
Addres
s
ing
M
ode
T
a
bl
e
10-2.
Opcod
e
Map
MS
B
LS
B
MS
B
LS
B
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.