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THE
80286
INSTRUCTION SET
MOV-Move Data
Opcode Instruction
Clocks
Description
88
/r
MOVeb,'rb
2,mem=3.
Move byte register into
EA
byte
89
/r
MOVew,rw
2,mem=3
Move word register into
EA
word
8A
/r
MOV rb,eb
2,mem=5
Move
EA
byte into byte register
88
/r
MOV rw,ew
2,mem=5
Move
EA
Word
into word register
8C
/0
MOVew,ES
2,mem=3
Move
ES
into
EA
word
8C
/1
MOVew,CS
2,mem=3
Move
CS
into
EA
word
8C
/2
MOVew,SS
2,mem=3
Move
SS
into
EA
word
8C
/3
MOVew,OS
2,mem=3
Move
OS
into
EA
word
8E
/0
MOV ES,mw
5,pm=19
Move memory word into
ES
8E
/0
MOV ES,rw
2,pm=17
Move word register into
ES
8E
/2
MOV SS,mw
5,pm=19
Move memory word. into
SS
8E
/2
MOV SS,rw
2,pm";'17
Move word register into
SS
8E
/3
MOV OS,mw
5,pm=19
Move memory word into
OS
8E
/3
MOV OS,rw
2,pm=17
Move word register into
OS
,
AO
dw
MOV AL,xb
5
Move byte variable (offset dw) into
AL
A1
dw
MOV AX,xw
5 Move word variable (offset dw) into
AX
A2
dw
MOV xb,AL
3 Move AL into byte
variable (offset dw)
A3
dw
MOV
xW,AX
3 Move
AX
into word register (offset dw)
80+
rb
db
MOV rb,db
2 Move immediate byte into byte register
88+
rw
dw
MOV rw,dw
2 Move immediate word into word register
C6
/0
db
MOVeb,db
2,mem=3
Move immediate byte into
EA
byte
C7
/0
dw·
MOVew,dw
2,mem=3
Move Immediate word into
EA
word
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
The second operand
is
copied to the first operand.
If
the destination operand
is
a segment register (OS, ES, or SS), then the associated segment register
cache
is
also loaded. The data for the cache
is
obtained from the descriptor table entry for the selector
given.
.
A null selector (values 0000-0003) can be loaded into OS and ES registers without causing a protection
exception. Any use of a segment register with a null selector to address memory
will
cause #GP(O)
exception.
No
memory reference
will
occur.
Any move into
SS
will
inhibit all interrupts until after the execution of the next instruction.
8~73