Intel 80C188XL Instruction Set Descriptions, Table C-4.Instruction Set Continued, C-47, Name

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
XLAT	Translate:	AL ← ((BX) + (AL))	AF –
	XLAT translate-table		CF –
			DF –
	Replaces a byte in the AL register with
			IF –
	a byte from a 256-byte, user-coded
			OF –
	translation table. Register BX is
			PF –
	assumed to point to the beginning of
			SF –
	the table. The byte in AL is used as an
			TF –
	index into the table and is replaced by
			ZF –
	the byte at the offset in the table corre-
	sponding to AL's binary value. The first
	byte in the table has an offset of 0. For
	example, if AL contains 5H, and the
	sixth element of the translation table
	contains 33H, then AL will contain 33H
	following the instruction. XLAT is
	useful for translating characters from
	one code to another, the classic
	example being ASCII to EBCDIC or
	the reverse.
	Instruction Operands:
	XLAT src-table
XOR	Exclusive Or:	(dest) ← (dest) xor (src)	AF ?
	XOR dest, src	(CF) ← 0	CF
		(OF) ← 0	DF –
	Performs the logical "exclusive or" of
			IF –
	the two operands and returns the
			OF
	result to the destination operand. A bit
			PF
	in the result is set if the corresponding
			SF
	bits of the original operands contain
			TF –
	opposite values (one is set, the other
			ZF ¸
	is cleared); otherwise the result bit is
	cleared.
	Instruction Operands:
	XOR reg, reg
	XOR reg, mem
	XOR mem, reg
	XOR accum, immed
	XOR reg, immed
	XOR mem, immed

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

C-47