Intel 80C188XL Instruction Set Descriptions, Table C-4.Instruction Set Continued, C-39, Name

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
ROR	Rotate Right:	(temp) ← count	AF –
	ROR dest, count	do while (temp) ≠ 0	CF
		(CF) ← low-order bit of (dest)	DF –
	Operates similar to ROL except that
		(dest) ← (dest) / 2	IF –
	the bits in the destination byte or word
		high-order bit of (dest) ← (CF)	OF ¸
	are rotated right instead of left.	(temp) ← (temp) – 1	PF –
	Instruction Operands:
		if	SF –
	ROR reg, n	count = 1	TF –
	ROR mem, n	then	ZF –
	ROR reg, CL	if
	ROR mem, CL	high-order bit of (dest) ≠
		next-to-high-order bit of (dest)
		then
		(OF) ← 1
		else
		(OF) ← 0
		else
		(OF) undefined
SAHF	Store Register AH Into Flags:	(SF):(ZF):X:(AF):X:(PF):X:(CF) ← (AH)	AF
	SAHF		CF
			DF –
	Transfers bits 7, 6, 4, 2, and 0 from
			IF –
	register AH into SF, ZF, AF, PF, and CF,
			OF –
	respectively, replacing whatever
			PF
	values these flags previously had.
			SF
	Instruction Operands:
			TF –
	none		ZF ¸

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-39