Intel 80C186XL, 80C188XL Jump if CX Zero, Jump on Equal Jump on Zero, Jump on Greater Than

INSTRUCTION SET DESCRIPTIONS

Table C-4. Instruction Set (Continued)

Name	Description	Operation	Flags
			Affected
JCXZ	Jump if CX Zero:	if	AF –
	JCXZ disp8	(CX) = 0	CF –
		then	DF –
	Transfers control to the target location
		(IP) ← (IP) + disp8 (sign-ext to 16 bits)	IF –
	if CX is 0. Useful at the beginning of a
			OF –
	loop to bypass the loop if CX has a
			PF –
	zero value, i.e., to execute the loop
			SF –
	zero times.
			TF –
	Instruction Operands:
			ZF –
	JCXZ short-label
JE	Jump on Equal:	if	AF –
JZ	Jump on Zero:	(ZF) = 1	CF –
	JE disp8	then	DF –
		(IP) ← (IP) + disp8 (sign-ext to 16 bits)	IF –
	JZ disp8
			OF –
	Transfers control to the target location
			PF –
	if the condition tested (ZF = 1) is true.
			SF –
	Instruction Operands:
			TF –
	JE short-label		ZF –
	JZ short-label
JG	Jump on Greater Than:	if	AF –
JNLE	Jump on Not Less Than or Equal:	((SF) = (OF)) and ((ZF) = 0)	CF –
	JG disp8	then	DF –
		(IP) ← (IP) + disp8 (sign-ext to 16 bits)	IF –
	JNLE disp8
			OF –
	Transfers control to the target location
			PF –
	if the condition tested (SF = OF) and
			SF –
	(ZF=0) is true.
			TF –
	Instruction Operands:
			ZF –
	JG short-label
	JNLE short-label
JGE	Jump on Greater Than or Equal:	if	AF –
JNL	Jump on Not Less Than:	(SF) = (OF)	CF –
	JGE disp8	then	DF –
		(IP) ← (IP) + disp8 (sign-ext to 16 bits)	IF –
	JNL disp8
			OF –
	Transfers control to the target location
			PF –
	if the condition tested (SF=OF) is true.
			SF –
	Instruction Operands:
			TF –
	JGE short-label		ZF –
	JNL short-label

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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