Intel 80C188XL, 80C186XL user manual Out String, Outs port, srcstring, Pop

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
OUTS	Out String:	(dst) ← (src)	AF –
	OUTS port, src_string		CF –
			DF –
	Performs block output from memory to
			IF –
	an I/O port. The port address is placed
			OF –
	in the DX register. The memory
			PF –
	address is placed in the SI register.
			SF –
	This instruction uses the DS segment
			TF –
	register, but this may be changed with
			ZF –
	a segment override instruction. After
	the data transfer takes place, the
	pointer register (SI) increments or
	decrements, depending on the value
	of the direction flag (DF). The pointer
	register changes by 1 for byte
	transfers or 2 for word transfers.
	Instruction Operands:
	OUTS port, src_string
	OUTS (repeat) port, src_string
POP	Pop:	(dest) ← ((SP) + 1:(SP))	AF –
	POP dest	(SP) ← (SP) + 2	CF –
			DF –
	Transfers the word at the current top of
			IF –
	stack (pointed to by SP) to the
			OF –
	destination operand and then
			PF –
	increments SP by two to point to the
			SF –
	new top of stack.
			TF –
	Instruction Operands:
			ZF –
	POP reg
	POP seg-reg (CS illegal)
	POP 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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