Intel mcs-48 manual JNI address Jump If Interrupt Input is Low Not in 8021

INSTRUCTION SET

(PCO-7)~ addr	If C=O
(PC) = (PC)+2	IF C=1
Example: JCO: JNC NOVFLO	;JUMP TO 'NOVFLO'ROUTINE
	;If C=O

JNI address Jump If Interrupt Input is Low (Not in 8021, 8022)

11 0 0 0 10 1 1 0 I 1a7 a6 as a4 Ia3 a2 a1 ao I

This is a 2-cycle instruction. Control passes to the specified address if the interrupt input signal is low (=0), that is, an external interrupt has

been signaled. (This signal initiates an interrupt service sequence if the external interrupt is enabled.)

(PCO-7)~ addr	If 1=0
(PC) = (PC)+2	If 1=1
Example: LOC 3: JNI EXTINT	;JUMP TO 'EXTINT'ROUTINE
	;If 1=0

JNTO address Jump If Test 0 Is Low (Not in 8021)

10 0 1 0 10 1 1 0 1 1a7 a6 as a4 1a3 a2 a1 ao I

This is a 2-cycle instruction. Control passes to the specified address, if the test 0 signal is low

(PCO-7)~ addr	If TO=O
(PC) = (PC)+2	If TO=1
Example: JTOLOW: JNTO 60	;JUMP TO LOCATION 60 DEC
	;IF TO=O

JNT1 address Jump If Test 1 Is Low

This is a 2-cycle instruction. Control passes to the specified address, if the test 1 signal is low.

(PCO-7)~ addr	If T1=0
(PC) = (PC)+2	If T1=1

JNZ address Jump If Accumulator Is Not Zero

11 0 0 1 10 1 1 0 1 1a7 a6 as a4 1a3 a2 a1 ao I

This is a 2-cycle instruction. Control pases to the specified address if the accumulator contents are nonzero at the time this instruction is executed.

(PCO-7)~ addr	If A"tO
(PC) = (PC)+2	If A=O
Example: JACCNO: JNZ OABH	;JUMP TO LOCATION 'AB'HEX
Mnemonics copyright Intel Corporation 1976.	;IF ACC VALUE IS NONZERO
	4-20