User's Manual

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