Intel 80C186XL, 80C188XL Instruction Set Descriptions, Table C-4.Instruction Set Continued, C-26

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
LDS	Load Pointer Using DS:	(dest) ← (EA)	AF –
	LDS dest, src	(DS) ← (EA + 2)	CF –
			DF –
	Transfers a 32-bit pointer variable from
			IF –
	the source operand, which must be a
			OF –
	memory operand, to the destination
			PF –
	operand and register DS. The offset
			SF –
	word of the pointer is transferred to the
			TF –
	destination operand, which may be
			ZF –
	any 16-bit general register. The
	segment word of the pointer is
	transferred to register DS.
	Instruction Operands:
	LDS reg16, mem32
LEA	Load Effective Address:	(dest) ← EA	AF –
	LEA dest, src		CF –
			DF –
	Transfers the offset of the source
			IF –
	operand (rather than its value) to the
			OF –
	destination operand.
			PF –
	Instruction Operands:
			SF –
	LEA reg16, mem16		TF –
			ZF –
LEAVE	Leave:	(SP) ← (BP)	AF –
	LEAVE	(BP) ← ((SP) + 1:(SP))	CF –
		(SP) ← (SP) + 2	DF –
	Reverses the action of the most recent
			IF –
	ENTER instruction. Collapses the last
			OF –
	stack frame created. First, LEAVE
			PF –
	copies the current BP to the stack
			SF –
	pointer releasing the stack space
			TF –
	allocated to the current procedure.
			ZF –
	Second, LEAVE pops the old value of
	BP from the stack, to return to the
	calling procedure's stack frame. A
	return (RET) instruction will remove
	arguments stacked by the calling
	procedure for use by the called
	procedure.
	Instruction Operands:
	none

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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