LCO-IV-------------------------------
• MASK OPTION
The following type mask option
is
available.
•
1/0
Terminal Format
••.•....
Selectone
of
A, B
or
C.
A:
Without pull-up
MOS
B:
With pull.up
MOS
C:
CMOS
output
(Note) External input
is
not
permitted
if
CMOS
output
is
selected
in
the case
of
I/O common terminals.
• I/O Statu.
in
the Halt State
....
Select Enable
or
Disable.
Enable
10utput
. . . . Maintained
in
the status before halt.
Pull·up
MOS
...
ON
Input
...
Unrelated
to
halt state
(Since Pull·up
MOS
is ON, if halt state occurs
when output
is
"0"
(Low) level (NMOS; ON), pull-
up
MOS
current always flows.
If
input changes,
transient current flows through the input circuit.
Also, current flows through the input pull·up
MOS.
These currents are added
to
standby power
supply current (or halt current).)
Disable 1 Output
NMOS
output;
OFF
CMOS
output;
High impedance
(NMOS,
PMOS;
OFF)
Pull-up
MOS
...
OFF
Input
...
Input circuit;
OFF
(Both input and output become high impedance
state. Since the input circuit
is
turned off, input
change does
not
cause current other than the
standby power supply current
or
halt current.)
• With
or
without externally attached Timer Crystal
Without timer crystal
...
The 0
14
and
015
can be used
as
general I/O terminals.
Select one
of
A, B
or
C in the 0
14
/0
15
column
ofthe
I/O format speCifications.
With timer crystal
...
The 0
14
and
015
cannot be used as general I/O ter·
minals.
Therefore, leave the 0
14
/0
15
column
in
blank.
Since the 0
14
latch can be set, reset
or
tested, it can
be used
as
a flag.
If
no internal halt exists, the
015
latch can be used
as
a
flag
same
as
the 0
14
latch.
If
internal halt exists, it
cannot be used
as
a general flag.
• With
or
without I nternal Halt
With internal halt
...
When internal halt
is
specified, the timer crystal must
also be specified.
Without internal halt
...
The
015
can be used
as
a general
I/O
terminal (when
no timer crystal
is
used)
or
as
a flag (when timer
crystal
is
used).
• OSCILLATION
CIRCUIT
The user can specify a resistor, or a ceramic filter or
an
external oscillator.
212
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