Central Processor Unit (CPU)
Instruction Set Summary
MC68HC908MR16/MC68HC908MR32
—
Rev. 5.0
Advance Information
MOTOROLA
Central Processor Unit (CPU)
81
BNE
rel
Branch if Not Equal
PC
←
(PC) + 2 +
rel
(Z) = 0
– – – – – –
REL
26
rr
3
BPL
rel
Branch if Plus
PC
←
(PC) + 2 +
rel
(N) = 0
– – – – – –
REL
2A
rr
3
BRA
rel
Branch Always
PC
←
(PC) + 2 +
rel
– – – – – –
REL
20
rr
3
BRCLR
n
,
opr
,
rel
Branch if Bit
n
in M Clear
PC
←
(PC) + 3 +
rel
(Mn) = 0
– – – – –
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
01
03
05
07
09
0B
0D
0F
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BRN
rel
Branch Never
PC
←
(PC) + 2
– – – – – –
REL
21
rr
3
BRSET
n
,
opr
,
rel
Branch if Bit
n
in M Set
PC
←
(PC) + 3 +
rel
(Mn) = 1
– – – – –
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
00
02
04
06
08
0A
0C
0E
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BSET
n
,
opr
Set Bit
n
in M
Mn
←
1
– – – – – –
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
10
12
14
16
18
1A
1C
1E
dd
dd
dd
dd
dd
dd
dd
dd
4
4
4
4
4
4
4
4
BSR
rel
Branch to Subroutine
PC
←
(PC) + 2; push (PCL)
SP
←
(SP)
–
1; push (PCH)
SP
←
(SP)
–
1
PC
←
(PC) +
rel
– – – – – –
REL
AD
rr
4
CBEQ
opr,rel
CBEQA #
opr,rel
CBEQX #
opr,rel
CBEQ
opr,
X+
,rel
CBEQ
X+
,rel
CBEQ
opr,
SP
,rel
Compare and Branch if Equal
PC
←
(PC) + 3 + rel (A)
–
(M) = $00
PC
←
(PC) + 3 + rel (A)
–
(M) = $00
PC
←
(PC) + 3 + rel (X)
–
(M) = $00
PC
←
(PC) + 3 + rel (A)
–
(M) = $00
PC
←
(PC) + 2 + rel (A)
–
(M) = $00
PC
←
(PC) + 4 + rel (A)
–
(M) = $00
– – – – – –
DIR
IMM
IMM
IX1+
IX+
SP1
31
41
51
61
71
9E61
dd rr
ii rr
ii rr
ff rr
rr
ff rr
5
4
4
5
4
6
CLC
Clear Carry Bit
C
←
0
– – – – –
0 INH
98
1
CLI
Clear Interrupt Mask
I
←
0
– –
0
– – –
INH
9A
2
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
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
Table 6-1. Instruction Set Summary (Sheet 3 of 8)
Source
Form
Operation
Description
Effect on
CCR
A
M
O
O
C
V H I N Z C