User's Manual

THE 80286 INSTRUCTION SET
LODS/LODSB/LODSW-Load String Operand
Opcode
AC
AD
AC
AD
FLAGS MODIFIED
None
Instruction
LODS mb
LODS mw
LODS8
LODSW
FLAGS UNDEFINED
None
OPERATION
Clocks
5
5
5
5
Description
Load byte [SI] into AL
Load word [SI] into AX
Load byte
DS:[SI] into AL
Load word DS:[SI] into AX
LODS loads the AL or AX register with the memory byte or word at SI. After the transfer is made,
SI is automatically advanced. If the direction flag is 0 (CLD was executed), SI increments; if the
direction flag
is 1 (STD was executed), SI decrements. SI increments or decrements by 1 if a byte was
moved; by 2 if a word was moved.
PROTECTED MODE EXCEPTIONS
#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.
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