User's Manual

THE 80286 INSTRUCTION SET
INC-Increment by 1
Opcode
FE /0
FF /0
40+rw
Instruction
INC eb
"INC
ew
INC rw
FLAGS MODIFIED
Clocks
2,mem=7
2,mem=7
2
Overflow, sign, zero, auxiliary carry, parity
FLAGS UNDEFINED
None
OPERATION
Description
Increment EA byte by 1
Increment EA word by 1
Increment word register by 1
1 is added to the operand. Note that the carry flag is not changed by this instruction. If you want the
carry flag;set, use the ADD instruction with a second operand of 1.
PROTECTED MODE EXCEPTIONS
#GP(O) if the operand is in a non-writable segment. #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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