8088 datasheet(30/30 Pages) INTEL

30 / 30 page

8088

80868088 Instruction Set Summary

(Continued)

Mnemonic and

Instruction Code

Description

76543210

PROCESSOR CONTROL

CLC e

Clear Carry

11111000

CMC e

Complement Carry

11110101

STC e

Set Carry

11111001

CLD e

Clear Direction

11111100

STD e

Set Direction

11111101

CLI e

Clear Interrupt

11111010

STI e

Set Interrupt

11111011

HLT e

Halt

11110100

WAIT e

Wait

10011011

ESC e

Escape (to External Device)

11011xxx

modxxxr m

LOCK e

Bus Lock Prefix

11110000

NOTES

AL e 8-bit accumulator

AX e 16-bit accumulator

CX e Count register

DS e Data segment

ES e Extra segment

Abovebelow refers to unsigned value

Greater e more positive

Less e less positive (more negative) signed values

if d e 1 then ‘‘to’’ reg if d e 0 then ‘‘from’’ reg

if w e 1 then word instruction if w e 0 then byte

instruction

if mod e 11 then rm is treated as a REG field

if mod e 00 then DISP e 0

disp-low and disp-high are

absent

if mod e 01 then DISP e disp-low sign-extended to

16 bits disp-high is absent

if mod e 10 then DISP e disp-high disp-low

if rm e 000 then EA e (BX) a (SI) a DISP

if rm e 001 then EA e (BX) a (DI) a DISP

if rm e 010 then EA e (BP) a (SI) a DISP

if rm e 011 then EA e (BP) a (DI) a DISP

if rm e 100 then EA e (SI) a DISP

if rm e 101 then EA e (DI) a DISP

if rm e 110 then EA e (BP) a DISP

if rm e 111 then EA e (BX) a DISP

DISP follows 2nd byte of instruction (before data if re-

quired)

except if mod e 00 and rm e then EA e disp-high

disp-low

if sw e 01 then 16 bits of immediate data form the oper-

and

if sw e 11 then an immediate data byte is sign extended

to form the 16-bit operand

if v e 0 then ‘‘count’’ e 1 if v e 1 then ‘‘count’’ in (CL)

x e don’t care

z is used for string primitives for comparison with ZF FLAG

SEGMENT OVERRIDE PREFIX

001reg110

REG is assigned according to the following table

16-Bit (w e 1)

8-Bit (w e 0)

Segment

000

001

010

011

100

101

110

111

Instructions which reference the flag register file as a 16-bit

object use the symbol FLAGS to represent the file

FLAGS e

XXXX(OF)(DF)(IF)(TF)(SF)(ZF)X(AF)X(PF)X(CF)

Mnemonics

Intel 1978

DATA SHEET REVISION REVIEW

The following list represents key differences be-

tween this and the -005 data sheet Please review

this summary carefully

1 The

Intel

8088

implementation

technology

(HMOS) has been changed to (HMOS-II)

8088 Datasheet(PDF) 30 Page - Intel Corporation

8088 Datasheet(HTML) 30 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Datasheet Download

Link URL