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THE
80286
INSTRUCTION SET
STO"";'Set
Direction Flag
Opcode Instruction
Clocks
Description
FO
STO
2 Set direction flag
50
51
and
01
will decrement
FLAGS MODIFIED
Direction = 1
FLAGS UNDEFINED
None
OPERATION
The direction flag
is
set
to
1.
This causes all subsequent string operations
to
decrement the index
registers
(SI and/or 01)
on
which they operate.
PROTECTED MODE EXCEPTIONS
None
REAL ADDRESS MODE EXCEPTIONS
None
8-105