Intel 80287, 80286 manual XOR-Logical Exclusive or, Xor

THE 80286 INSTRUCTION SET

XOR-Logical Exclusive OR

Opcode			Instruction		Clocks	Description
30	Ir		XOR	eb,rb	2,mem=7	Exclusive-OR byte register into EA byte
31	Ir		XOR	eW,rw	2,mem=7	Exclusive-OR word register into EA word
32	Ir		XOR	rb,eb	2,mem=7	Exclusive-OR EA byte into byte register
33	Ir		XOR	rw,ew	2,mem=7	Exclusive-OR EA word into word register
34	db		XOR	AL,db	3	Exclusive-OR immediate byte into AL
35	dw		XOR	AX,dw	3	Exclusive-OR immediate word into AX
80	16	db	XOR	eb,db	3,mem=7	Exclusive-OR immediate byte into EA byte
81	16	dw	XOR	eW,dw	3,mem=7	Exclusive-OR immediate word into EA word

FLAGS MODIFIED

Overflow =0, sign, zero, parity, carry=O

FLAGS UNDEFINED

Auxiliary carry

OPERATION

XOR computes the exclusive OR of the two operands. Each bit of the result is 1 if the corresponding bits of the operands are different; each bit is 0 if the corresponding bits are the same. The answer replaces the first operand.

PROTECTED MODE EXCEPTIONS

#GP(O) if the result is in a non-writable segment. #GP(O) for an illegal memory operand effective address in the es, 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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