Intel 80C186XL, 80C188XL user manual Pop All, Pop Flags, Push

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
POPA	Pop All:	(DI) ← ((SP) + 1:(SP))	AF –
	POPA	(SP) ← (SP) + 2	CF –
		(SI) ← ((SP) + 1:(SP))	DF –
	Pops all data, pointer, and index
		(SP) ← (SP) + 2	IF –
	registers off of the stack. The SP value
		(BP) ← ((SP) + 1:(SP))	OF –
	popped is discarded.
		(SP) ← (SP) + 2	PF –
	Instruction Operands:
		(BX) ← ((SP) + 1:(SP))	SF –
	none	(SP) ← (SP) + 2	TF –
		(DX) ← ((SP) + 1:(SP))	ZF –
		(SP) ← (SP) + 2
		(CX) ← ((SP) + 1:(SP))
		(SP) ← (SP) + 2
		(AX) ← ((SP) + 1:(SP))
		(SP) ← (SP) + 2
POPF	Pop Flags:	Flags ← ((SP) + 1:(SP))	AF
	POPF	(SP) ← (SP) + 2	CF
			DF
	Transfers specific bits from the word at
			IF
	the current top of stack (pointed to by
			OF
	register SP) into the 8086/8088 flags,
			PF
	replacing whatever values the flags
			SF
	previously contained. SP is then
			TF
	incremented by two to point to the new
			ZF ¸
	top of stack.
	Instruction Operands:
	none
PUSH	Push:	(SP) ← (SP) – 2	AF –
	PUSH src	((SP) + 1:(SP)) ← (src)	CF –
			DF –
	Decrements SP by two and then
			IF –
	transfers a word from the source
			OF –
	operand to the top of stack now
			PF –
	pointed to by SP.
			SF –
	Instruction Operands:
			TF –
	PUSH reg		ZF –
	PUSH seg-reg (CS legal)
	PUSH mem

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

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