M68HC08RG/AD
MOTOROLA
M68HC08 Family Reference Guide
9
CLR opr8a
CLRA
CLRX
CLRH
CLR oprx8,X
CLR ,X
CLR oprx8,SP
Clear
M
←
$00
A
←
$00
X
←
$00
H
←
$00
M
←
$00
M
←
$00
M
←
$00
0
–
–
0
1
–
DIR
INH
INH
INH
IX1
IX
SP1
3F
4F
5F
8C
6F
7F
9E6F
dd
ff
ff
3
1
1
1
3
2
4
CMP #opr8i
CMP opr8a
CMP opr16a
CMP oprx16,X
CMP oprx8,X
CMP ,X
CMP oprx16,SP
CMP oprx8,SP
Compare Accumulator
with Memory
(A) – (M)
(CCR Updated But Operands Not
Changed)
–
–
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A1
B1
C1
D1
E1
F1
9ED1
9EE1
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
2
5
4
COM opr8a
COMA
COMX
COM oprx8,X
COM ,X
COM oprx8,SP
Complement
(One’s Complement)
M
←
(M)= $FF – (M)
A
←
(A) = $FF – (A)
X
←
(X) = $FF – (X)
M
←
(M) = $FF – (M)
M
←
(M) = $FF – (M)
M
←
(M) = $FF – (M)
0
–
–
1
DIR
INH
INH
IX1
IX
SP1
33
43
53
63
73
9E63
dd
ff
ff
4
1
1
4
3
5
CPHX #opr
CPHX opr
Compare Index Register
(H:X) with Memory
(H:X) – (M:M + $0001)
(CCR Updated But Operands Not
Changed)
–
–
IMM
DIR
65
75
jj ii+1
dd
3
4
CPX #opr8i
CPX opr8a
CPX opr16a
CPX oprx16,X
CPX oprx8,X
CPX ,X
CPX oprx16,SP
CPX oprx8,SP
Compare X (Index
Register Low) with
Memory
(X) – (M)
(CCR Updated But Operands Not
Changed)
–
–
IMM
DIR
EXT
IX2
IX1
IX
SP2
SP1
A3
B3
C3
D3
E3
F3
9ED3
9EE3
ii
dd
hh ll
ee ff
ff
ee ff
ff
2
3
4
4
3
2
5
4
DAA
Decimal Adjust
Accumulator After ADD or
ADC of BCD Values
(A)
10
U –
–
INH
72
2
DBNZ opr8a,rel
DBNZA rel
DBNZX rel
DBNZ oprx8,X,rel
DBNZ ,X,rel
DBNZ oprx8,SP,rel
Decrement and Branch if
Not Zero
Decrement A, X, or M
Branch if (result)
≠
0
DBNZX Affects X Not H
–
–
–
–
–
–
DIR
INH
INH
IX1
IX
SP1
3B
4B
5B
6B
7B
9E6B
dd rr
rr
rr
ff
rr
rr
ff
rr
5
3
3
5
4
6
DEC opr8a
DECA
DECX
DEC oprx8,X
DEC ,X
DEC oprx8,SP
Decrement
M
←
(M) – $01
A
←
(A) – $01
X
←
(X) – $01
M
←
(M) – $01
M
←
(M) – $01
M
←
(M) – $01
–
–
–
DIR
INH
INH
IX1
IX
SP1
3A
4A
5A
6A
7A
9E6A
dd
ff
ff
4
1
1
4
3
5
DIV
Divide
A
←
(H:A)
÷
(X)
H
←
Remainder
–
–
–
–
INH
52
7
Table 2. Instruction Set Summary (Sheet 4 of 8)
Source
Form
Operation
Description
Effect
on CCR
Ad
dress
M
ode
Opc
o
de
O
p
erand
Cycl
es
V H I N Z C
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
.
..
