JNZ
JP
Chapter 3.
Instruction
Set
Example:
Examples
of
the variations
of
the jump instruction appear
in
the description
of
the J
PO
instruction.
JUMP
IF NOT ZERO
The J
NZ
instruction tests the setting
of
the zero flag. If the
contents
of
the accumulator are
not
zero (zero
flag
= 0), program execution resumes
at
the address specified
in
the
JNZ
instruction. If the
contents
of
the
accumulator
are zero (zero flag = 1), execution continues with the next sequential instruction.
Opcode Operand
JNZ
address
The address may
be
specified as a number, a label, or an expression. The assembler inverts the high and low
address
bytes when
it
assembles the instruction.
Example:
o 0 0 0 0
~-----------------------------
Cycles:
States:
Addressing:
Flags:
lowaddr
high addr
3
(2
or 3 on 8085)
10
(7
or 10 on 8085)
immediace
none
Examples
of
the variation'>
of
the jump instruction appear
in
the description
of
the J
PO
instruction.
JUMP
IF POSITIVE
The J P instruction
te'>t<,
thc setting
of
the sign flag. If thc
contcnts
of
the accumulator are positive (sign
flag
c=
0),
program
cxccution
rcsumes
at
the address specified
in
thc
JP
in~truclion.
If the
contents
of
the accumulator arc
minus (sign flag
= 1), cxecution continues with thr,
next
sequential instruction.
Op co de Operand
JP
addre'>s
The
addrcs,>
may
bc
specificd
a,
a number, a label, or an expre.,,,ion. Thc asscmblcr
invert'>
the high and low urdcl
audrc'>s
bytcs when
it
assembles the instruction.
3-29
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