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INSTRUCTION SET
JF1
address Jump If Flag 1
Is
Set (Not in 8021, 8022)
1 0 1 1 1 1 0 1 1 0 1 1
a7
a6
as
a4
1
a3
a2
a1
ao
1
This
is a 2-cycle
instruction.
Control
passes
to
the
specified address
if
flag 1 is set
to
one.
(PCO-7)"-
addr
(PC) = (PC)+2
Example:
JF1IS1: JF1 FILBUF
If
F1
=1
IF F1=0
;JUMP
TO
'FILBUF'
;ROUTINE
IF
F1=1
JMP address Direct Jump Within 2K Block
Example:
I a10
ag
as 0 I 0 1 0 0 1 I
a7 a6
as
a4
1
a3 a2
a1
ao 1
This
is a 2-cycle
instruction.
Bits 0-10
of
the
program
counter
are replaced
with
the
directly-specified
address. The setting
of
PC
bit
11
is determined
by
the
most
recent
SELECT
MB instruction.
(PCS-10)--
addr
8-10
(PCO-7)"-
addr
0-7
(PC
11
)--
DBF
JMP
SUBTOT
JMP
$-6
JMP 2FH
;JUMP
TO
SUBROUTINE
'SUBTOT
;JUMP
TO
INSTRUCTION SIX LOCATIONS
;BEFORE CURRENT LOCATION
;JUMP
TO
ADDRESS '2F' HEX
JMPP
@A
Indirect Jump Within Page
11011100111
This
is a 2-cycle
instruction.
The
contents
of
the
program
memory
location
pointed
to
by
the
accumulator
are
substituted
for
the
'page'
portion
of
the
program
counter
(PC bits 0-7).
(PCO-7)"-
((A))
Example: Assume
accumulator
contains
OFH.
JMPPAG:
JMPP
@A
;JUMP
TO
ADDRESS STORED IN
;LOCATION
15 IN
CURRENT
PAGE
JNC address Jump If Carry Is Not Set
11
1 1 0 1 0 1 1 0 1 I
a7
a6 as
a4
1
a3
a2
a1
ao
I·
This
is a 2-cycle
instruction.
Control
passes
to
the
specified address
if
the
carry
bit
is
not
set,
that
is, equals zero.
Mnemonics copyright Intel Corporation
1976.
4-19