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THE
80286
INSTRUCTION SET
MOVS/MOVSB/MOVSW-Move
Data
from
String
to
String
Opcode Instruction
A4
MOVS
mb,mb
A5 MOVS
mW,mw
A4
MOVS8
A5
MOVSW
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
Clocks
5
5
5
5
Description
Move
byte [SI]
to
ES:[OI]
Move
word
[SI]
to
ES:[OI]
Move
byte OS:[SI] to ES:[OI]
Move
word
OS:[SI]
to
ES:[OI]
MOYS copies the byte or word
at
[Sl]to
the byte or word
at
ES:[DI). The destination operand must
be addressable from the ESregister;
no
segment override
is
possible. A segment override may be used
for the source operand.
After the data movement
is
made, both
SI
and DI are automatically advanced.
If
the direction flag
is
o (CLD
was
executed), the registers increment; if the direction flag
is
1 (STD
was
executed), the
registers decrement. The. registers increment or decrement by 1 if a byte
was
moved;
by
2
if
a word
was
moved.
MOYS can be preceded by the REP prefix for block movement of CX bytes or words. Refer to the
REP instruction for details of this operation.
PROTECTED MODE EXCEPTIONS
#GP(O)
if the destination
is
in
a non-writable segment.
#GP(O)
for an illegal memory operand effective
address in the
CS, DS, or ES segments;
#SS(O)
for an illegal address in the SS segment.
REAL ADDRESS MODE EXCEPTIONS
Interrupt
13
for a word operand
at
offset OFFFFH.
8-75