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Central Processor Unit (CPU)
Table 8-1. Instruction Set Summary (Sheet 3 of 6)
Source
Form
Operation
Description
Effect
on CCR
VH I NZC
CLR opr
CLRA
CLRX
CLRH
CLR opr,X
CLR ,X
CLR opr,SP
Clear
M ← $00
A ← $00
X ← $00
H ← $00
M ← $00
M ← $00
M ← $00
DIR
INH
INH
0 – – 0 1 – INH
IX1
IX
SP1
CMP #opr
CMP opr
CMP opr
CMP opr,X
CMP opr,X
CMP ,X
CMP opr,SP
CMP opr,SP
Compare A with M
(A) – (M)
IMM
DIR
EXT

–
–



IX2
IX1
IX
SP1
SP2
COM opr
COMA
COMX
COM opr,X
COM ,X
COM opr,SP
Complement (One’s Complement)
M ← (M) = $FF – (M)
A ← (A) = $FF – (M)
X ← (X) = $FF – (M)
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
DIR
INH
0
–
–


1
INH
IX1
IX
SP1
CPHX #opr
CPHX opr
Compare H:X with M
(H:X) – (M:M + 1)

–
–



IMM
DIR
CPX #opr
CPX opr
CPX opr
CPX ,X
CPX opr,X
CPX opr,X
CPX opr,SP
CPX opr,SP
Compare X with M
(X) – (M)
IMM
DIR
EXT

–
–



IX2
IX1
IX
SP1
SP2
DAA
Decimal Adjust A
(A)₁₀
U – –    INH
A ← (A) – 1 or M ← (M) – 1 or X ← (X) – 1
DBNZ opr,rel
PC ← (PC) + 3 + rel ? (result) ≠ 0
DIR
DBNZA rel
PC ← (PC) + 2 + rel ? (result) ≠ 0
INH
DBNZX rel
Decrement and Branch if Not Zero PC ← (PC) + 2 + rel ? (result) ≠ 0 – – – – – – INH
DBNZ opr,X,rel
PC ← (PC) + 3 + rel ? (result) ≠ 0
IX1
DBNZ X,rel
PC ← (PC) + 2 + rel ? (result) ≠ 0
IX
DBNZ opr,SP,rel
PC ← (PC) + 4 + rel ? (result) ≠ 0
SP1
DEC opr
DECA
DECX
DEC opr,X
DEC ,X
DEC opr,SP
Decrement
M ← (M) – 1
A ← (A) – 1
X ← (X) – 1
M ← (M) – 1
M ← (M) – 1
M ← (M) – 1
DIR
INH

–
–


–
INH
IX1
IX
SP1
DIV
Divide
A ← (H:A)/(X)
H ← Remainder
– – – –   INH
EOR #opr
EOR opr
EOR opr
EOR opr,X
EOR opr,X
EOR ,X
EOR opr,SP
EOR opr,SP
Exclusive OR M with A
A ← (A ⊕ M)
IMM
DIR
EXT
0
–
–


–
IX2
IX1
IX
SP1
SP2
INC opr
INCA
INCX
INC opr,X
INC ,X
INC opr,SP
Increment
M ← (M) + 1
A ← (A) + 1
X ← (X) + 1
M ← (M) + 1
M ← (M) + 1
M ← (M) + 1
DIR
INH

–
–


–
INH
IX1
IX
SP1
3F dd 3
4F
1
5F
1
8C
1
6F ff
3
7F
2
9E6F ff
4
A1 ii
2
B1 dd 3
C1 hh ll 4
D1 ee ff 4
E1 ff
3
F1
2
9EE1 ff
4
9ED1 ee ff 5
33 dd 4
43
1
53
1
63 ff
4
73
3
9E63 ff
5
65 ii ii+1 3
75 dd 4
A3 ii
2
B3 dd 3
C3 hh ll 4
D3 ee ff 4
E3 ff
3
F3
2
9EE3 ff
4
9ED3 ee ff 5
72
2
3B dd rr
4B rr
5B rr
6B ff rr
7B rr
9E6B ff rr
5
3
3
5
4
6
3A dd 4
4A
1
5A
1
6A ff
4
7A
3
9E6A ff
5
52
7
A8 ii
2
B8 dd 3
C8 hh ll 4
D8 ee ff 4
E8 ff
3
F8
2
9EE8 ff
4
9ED8 ee ff 5
3C dd 4
4C
1
5C
1
6C ff
4
7C
3
9E6C ff
5
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
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Freescale Semiconductor