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ESC
ESCAPE
ESC
Operation:
Flags Affected:
if
mod
:I
11
then data
bus
-
(EA)
Description:
The ESC (Escape) instruction provides a
mechanism by which other processors
(coprocessors) may receive their instructions
from the
8086 or
8088
instruction stream and
make use of the
8086 or
8088
addressing
modes. The
CPU (8086 or
8088)
does a no
operation
(NOP) for the ESC instruction other
than to access a memory operand and place it
on the bus.
Encoding:
11011x
mod
x
rIm
None
ESC
Operands Clocks· Transfers Bytes
immediate, memory
·8(12)
+
EA
1
2-4
immediate, register 2 - 2
ESC
Coding Example
ESC
6,ARRA Y
[SI]
ESC
20,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.
2-75