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THE
80286
INSTRUCTION SET
OUT
-Output
to
Port
Opcode
Instruction
E6 db
OUT db,AL
E7
db
OUT db,AX
EE
OUT OX,AL
EF
OUT
OX,AX
FLAGS MODIFIED
None
FLAGS UNDEFINED
None
OPERATION
Clocks
3
3
3
3
Description
Output byte AL to
immediate port number db.
Output word
AX
to immediate port number db
Output byte AL to port number
OX
Output word
AX
to port number
OX
OUT transfers a data byte or data word from the register
CAL
or AX) given.as the second operand
to
the output port numbered by the first operand. You can output to any port from{)-65535
by
placing
the port number in the DX register then using an
OUT instruction with DX as the first operand.
If
the
instruction contains an 8-bit port ID,
that
value
is
zero-extended to
16
bits.
Intel reserves
I/0
port addresses
OOF8H
through
OOFFH;
these addresses should not be used.
PROTECTED MODE EXCEPTIONS
#GP(O) if the current privilege level is bigger (has less privilege) than IOPL, which
is
the privilege
level found in the flags register.
REAL ADDRESS MODE EXCEPTIONS
None
8-81