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C-27
INSTRUCTION SET DESCRIPTIONS
LES Load Pointer Using ES:
LES
dest, src
Transfers a 32-bit pointer variable from
the source operand to the destination
operand and register ES. The offset
word of the pointer is transferred to the
destination operand. The segment
word of the pointer is transferred to
register ES.
Instruction Operands:
LES reg16, mem32
(dest) ← (EA)
(ES) ← (EA + 2)
AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
LOCK Lock the Bus:
LOCK
Causes the 8088 (configured in
maximum mode) to assert its bus
LOCK signal while the following
instruction executes. The instruction
most useful in this context is an
exchange register with memory.
The LOCK prefix may be combined
with the segment override and/or REP
prefixes.
Instruction Operands:
none
none AF –
CF –
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
the flag is updated after the instruction is executed