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OUT
OUTPUT
OUT
Operation:
(DEST) - (SRC)
Description:
OUT port,accumulator
OUT transfers a byte
or
a word from the AL
register or the AX register, respectively, to an
output port. The
port
number may be speci-
fied either with an immediate byte constant,
allowing access to ports numbered
0 through
Encoding:
Fixed Port:
1111
00
11 w 1
port
if w = 0 then SRC = AL, DEST = port
else SRC = AX, DEST =
port
+ 1
:port
Variable Port:
11110111wl
if w = 0 then SRC = AL, DEST = (DX)
else SRC = AX, DEST = (DX) + 1 :(DX)
Flags Affected:
None
255,
or
with a number previously placed in
register DX, allowing variable access (by
changing the value in DX) to ports numbered
from
0 through 65,535.
OUT
Operands
Clocks*
Transfers
Bytes
OUT
Coding
Example
immed8, accuml,Jlator
10(14)
1 2 OUT
44,
AX
DX,
accumulator
8(12)
1 1
PUT
DX, AL
.:
*b(w):
where
b
denotes
the
number
of
clock
cycles
for
byte
operands
and
w
denotes
the
number
of
clock
cycles
for
word operands.
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