Central Processor Unit (CPU)
Table 4-1. Instruction Set Summary
Effect on
CCR
Source
Form
Operation
Description
V H I N Z C
PULH
Pull H from Stack
Pull X from Stack
SP ← (SP + 1); Pull (H)
SP ← (SP + 1); Pull (X)
–
–
–
–
–
–
–
–
–
–
– INH
– INH
8A
88
2
2
PULX
ROL opr
ROLA
ROLX
ROL opr,X
ROL ,X
ROL opr,SP
DIR
INH
INH
IX1
IX
39
49
59
69
79
dd
ff
4
1
1
4
3
5
C
Rotate Left through Carry
Rotate Right through Carry
o
o
–
–
–
–
o
o
o
o
o
b7
b0
SP1
9E69 ff
ROR opr
RORA
RORX
ROR opr,X
ROR ,X
ROR opr,SP
DIR
INH
INH
IX1
IX
36
46
56
66
76
dd
4
1
1
4
3
5
C
o
ff
b7
b0
SP1
9E66 ff
RSP
Reset Stack Pointer
Return from Interrupt
SP ← $FF
–
–
–
–
–
– INH
9C
1
SP ← (SP) + 1; Pull (CCR)
SP ← (SP) + 1; Pull (A)
SP ← (SP) + 1; Pull (X)
SP ← (SP) + 1; Pull (PCH)
SP ← (SP) + 1; Pull (PCL)
RTI
o
o
o
o
o
o INH
80
81
7
SP ← SP + 1; Pull (PCH)
SP ← SP + 1; Pull (PCL)
RTS
Return from Subroutine
Subtract with Carry
–
–
–
–
–
–
–
– INH
4
SBC #opr
SBC opr
SBC opr
SBC opr,X
SBC opr,X
SBC ,X
SBC opr,SP
SBC opr,SP
IMM
DIR
EXT
A2
B2
C2
D2
E2
F2
ii
2
3
4
4
3
2
4
5
dd
hh ll
ee ff
ff
IX2
IX1
A ← (A) – (M) – (C)
o
o
o
o
IX
SP1
SP2
9EE2 ff
9ED2 ee ff
SEC
SEI
Set Carry Bit
C ← 1
I ← 1
–
–
–
–
–
1
–
–
–
–
1 INH
– INH
99
9B
1
2
Set Interrupt Mask
STA opr
STA opr
DIR
EXT
IX2
– IX1
IX
B7
C7
D7
E7
F7
dd
3
4
4
3
2
4
5
hh ll
ee ff
ff
STA opr,X
STA opr,X
STA ,X
STA opr,SP
STA opr,SP
Store A in M
M ← (A)
0
–
–
o
o
SP1
SP2
9EE7 ff
9ED7 ee ff
STHX opr
Store H:X in M
(M:M + 1) ← (H:X)
0
–
–
–
–
0
o
o
– DIR
– INH
35
8E
dd
4
1
STOP
Enable IRQ Pin; Stop Processing
I ← 0; Stop Processing
–
–
MC68HC908AP Family Data Sheet, Rev. 4
66
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