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D-21
INSTRUCTION SET OPCODES AND CLOCK CYCLES
Table D-4. Mnemonic Encoding Matrix (Right Half)
x8 x9 xA xB xC xD xE xF
OR
b,f,r/m
OR
w,f,r/m
OR
b,t,r/m
OR
w,t,r/m
OR
b,i
OR
w,i
PUSH
CS
0x
SBB
b,f,r/m
SBB
w,f,r/m
SBB
b,t,r/m
SBB
w,t,r/m
SBB
b,i
SBB
w,i
PUSH
DS
POP
DS
1x
SUB
b,f,r/m
SUB
w,f,r/m
SUB
b,t,r/m
SUB
w,t,r/m
SUB
b,i
SUB
w,i
SEG
=CS
DAS
2x
CMP
b,f,r/m
CMP
w,f,r/m
CMP
b,t,r/m
CMP
w,t,r/m
CMP
b,i
CMP
w,i
SEG
=DS
AAS
3x
DEC
AX
DEC
CX
DEC
DX
DEC
BX
DEC
SP
DEC
BP
DEC
SI
DEC
DI
4x
POP
AX
POP
CX
POP
DX
POP
BX
POP
SP
POP
BP
POP
SI
POP
DI
5x
PUSH
w,i
IMUL
w,i
PUSH
b,i
IMUL
w,i
INS
b
INS
w
OUTS
b
OUTS
w
6x
JS JNS JP/
JPE
JNP/
JPO
JL/
JNGE
JNL/
JGE
JLE/
JNG
JNLE/
JG
7x
MOV
b,f,r/m
MOV
w,f,r/m
MOV
b,t,r/m
MOV
w,t,r/m
MOV
sr,f,r/m
LEA MOV
sr,t,r/m
POP
r/m
8x
CBW CWD CALL
L,D
WAIT PUSHF POPF SAHF LAHF
9x
TEST
b,ia
TEST
w,ia
STOS STOS LODS LODS SCAS SCAS
Ax
MOV
i→AX
MOV
i→CX
MOV
i→DX
MOV
i→BX
MOV
i→SP
MOV
i→BP
MOV
i→SI
MOV
i→DI
Bx
ENTER LEAVE RET
l(i+SP)
RET
l
INT
type 3
INT
(any)
INTO IRET
Cx
ESC
0
ESC
1
ESC
2
ESC
3
ESC
4
ESC
5
ESC
6
ESC
7
Dx
CALL JMP JMP JMP IN IN OUT OUT
Ex
CLC STC CLI STI CLS STD Grp2
b,r/m
Grp2
w,r/m
Fx
NOTE: Table D-5 defines abbreviations used in this matrix. Shading indicates reserved opcodes.