Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
Table 5-1. Instruction Set Summary (Sheet 6 of 7)
Effect
Source
Form
on CCR
Operation
Description
V H I N Z C
RSP
Reset Stack Pointer
SP ← $FF
–
–
–
–
–
– INH
9C
80
1
7
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
Return from Interrupt
✣ ✣ ✣ ✣ ✣ ✣ INH
SP ← SP + 1; Pull (PCH)
SP ← SP + 1; Pull (PCL)
RTS
Return from Subroutine
–
–
–
–
–
–
– INH
81
4
SBC #opr
SBC opr
SBC opr
SBC opr,X
SBC opr,X
SBC ,X
SBC opr,SP
SBC opr,SP
IMM
DIR
EXT
IX2
IX1
IX
SP1
SP2
A2 ii
B2 dd
C2 hh ll
D2 ee ff
E2 ff
2
3
4
4
3
2
4
5
Subtract with Carry
A ← (A) – (M) – (C)
✣ –
✣ ✣ ✣
F2
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
DIR
EXT
IX2
B7 dd
C7 hh ll
D7 ee ff
E7 ff
3
4
4
3
2
4
5
STA opr
STA opr,X
STA opr,X
STA ,X
STA opr,SP
STA opr,SP
Store A in M
M ← (A)
0
–
–
✣ ✣ – IX1
IX
SP1
SP2
F7
9EE7 ff
9ED7 ee ff
STHX opr
Store H:X in M
(M:M + 1) ← (H:X)
0
–
–
–
–
0
✣ ✣ – DIR
35 dd
8E
4
1
STOP
Enable IRQ Pin; Stop Oscillator
I ← 0; Stop Oscillator
–
–
– INH
STX opr
DIR
EXT
IX2
BF dd
CF hh ll
DF ee ff
EF ff
3
4
4
3
2
4
5
STX opr
STX opr,X
STX opr,X
STX ,X
STX opr,SP
STX opr,SP
Store X in M
M ← (X)
0
–
–
–
✣ ✣ – IX1
IX
SP1
SP2
FF
9EEF ff
9EDF ee ff
SUB #opr
SUB opr
SUB opr
SUB opr,X
SUB opr,X
SUB ,X
SUB opr,SP
SUB opr,SP
IMM
DIR
EXT
A0 ii
B0 dd
C0 hh ll
D0 ee ff
E0 ff
2
3
4
4
3
2
4
5
IX2
✣ ✣ ✣
IX1
Subtract
A ← (A) – (M)
✣ –
IX
SP1
SP2
F0
9EE0 ff
9ED0 ee ff
PC ← (PC) + 1; Push (PCL)
SP ← (SP) – 1; Push (PCH)
SP ← (SP) – 1; Push (X)
SP ← (SP) – 1; Push (A)
SWI
Software Interrupt
–
–
1
–
–
– INH
83
9
SP ← (SP) – 1; Push (CCR)
SP ← (SP) – 1; I ← 1
PCH ← Interrupt Vector High Byte
PCL ← Interrupt Vector Low Byte
TAP
TAX
Transfer A to CCR
Transfer A to X
CCR ← (A)
X ← (A)
✣ ✣ ✣ ✣ ✣ ✣ INH
– INH
84
97
2
1
–
– – – –
Advance Information
76
MC68HC908RFRK2
MOTOROLA
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
FREESCALE [ Freescale ]
