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Instruction Set Summary
A-5
INTO
= Interrupt on overflow
1 1 0 0 1 1 1 0
4-73
IRET
= Interrupt return
1 1 0 0 1 1 1 1
4-76
JA/JNBE
= Jump on: above/not below
or equal
JAE/JNB/JNC
= Jump on: above or
equal/not below/not carry
JB/JC/JNAE
= Jump on: below/
compare/not above or equal
JBE/JNA
= Jump on: below or equal/not
above
JCXZ
= Jump on CX = zero
0 1 1 1 0 1 1 1
disp-8
4-78
0 1 1 1 0 0 1 1
disp-8
4-80
0 1 1 1 0 0 1 0
disp-8
4-82
0 1 1 1 0 1 1 0
disp-8
4-84
1 1 1 0 0 0 1 1
disp-8
4-87
JE/JZ
= Jump on: equal/zero
0 1 1 1 0 1 0 0
disp-8
4-89
JG/JNLE
= Jump on: greater/not less or
equal
JGE/JNL
= Jump on: greater or equal/
not less
JL/JNGE
= Jump on: less/not greater or
equal
JLE/JNG
= Jump on: less or equal/not
greater
JMP
= Unconditional jump:
0 1 1 1 1 1 1 1
disp-8
4-91
0 1 1 1 1 1 0 1
disp-8
4-93
0 1 1 1 1 1 0 0
disp-8
4-95
0 1 1 1 1 1 1 0
disp-8
4-97
4-99
Short/long
1 1 1 0 1 0 1 1
disp-8
Direct within segment
1 1 1 0 1 0 0 1
disp-low
disp-high
Register/mem indirect within seg.
1 1 1 1 1 1 1 1
mod 100 r/m
Direct intersegment
1 1 1 0 1 0 1 0
disp-low
disp-high
seg-low
seg-high
Indirect intersegment
1 1 1 1 1 1 1 1
mod 101 r/m
(mod
≠
11)
JNE/JNZ
= Jump on: not equal/not zero
0 1 1 1 0 1 0 1
disp-8
4-107
JNO
= Jump on not overflow
0 1 1 1 0 0 0 1
disp-8
4-113
JNS
= Jump on not sign
0 1 1 1 1 0 0 1
disp-8
4-116
JO
= Jump on overflow
0 1 1 1 0 0 0 0
disp-8
4-119
JPE/JP
= Jump on: parity even/parity
0 1 1 1 1 0 1 0
disp-8
4-122
JPO/JNP
= Jump on: parity odd/not
parity
JS
= Jump on sign
0 1 1 1 1 0 1 1
disp-8
4-124
0 1 1 1 1 0 0 0
disp-8
4-126
LAHF
= Load AH with flags
1 0 0 1 1 1 1 1
4-129
LDS
= Load pointer to DS
1 1 0 0 0 1 0 1
mod reg r/m
(mod
≠
11)
4-131
LEA
= Load EA to register
1 0 0 0 1 1 0 1
mod reg r/m
4-133
T able A-2
Instruc tion S et S ummary by Mnemonic
Instruction
Opcode
For
More
Info.,
See
Page
Notes:
* Indicates instructions not available in 8086 or 8088 systems.
**Indicates instructions that are not supported with the necessary pinout.
***The external LOCK pin is only available on some members of the Am186 and Am188 family of microcontrollers. However, LOCK internal
logic is still in effect on parts without the LOCK pin.