Marantz ST-40 - Page 15

Key Matrix
Initial setting @5) 5
PC2
Dd!
D2
One time of
output
when
a
key
D3
is
pressed
A
model
without
LW has “AM” here.
04
DS
A figure in ( ) refers only to models for Japan.
10-3. Description of Keys
(0)~(2): Numeral keys Pin Connections
Preset memory writing, call and direct access call
(™)
(wm)
Ge)
:
Band
selection
keys
With a model without LW, “LW” key becomes “AM” key.
: Mono/stereo output selection key
At FM, when this key is pressed, OUT1 of PLL IC LC7218
varies between “LOW” and “HIGH” cyclically. In synchro-
nization with this variation, “AUTO” in the FL display flickers.
Gown) : Tuning up/down keys
The tuning frequency increases or decreases by 1 step at
each pressure (for less than 0.5 second), and varies rapidly at
a rate of approximately 70 msec/step when either is pressed
continuously for 0.5 second or more. In this situation, when
that key is released from hand pressure, auto tuning is
performed.
R.C IN
(2) : Memory writing key i
When the key is pressed, “MEMORY” flickers (at 1 Hz) for
approximately 5 seconds, thus indicating that the memory is
capable of writing. The wanted number is input by means of a
HOLD
CLOCK
cE
numeral
key,
the
1/2
(./..)
digit
key
and
a
numeral
key
where
BATMAN:
fon
necessary,
in
which
way
at
the
point
of
time
when
a
digit
of
DATA
OUT
units
order
is
input,
the
frequency
then
being
received
is
extnation
memorized.
Selection
C)
+112
digit
key
see
Externally
This key is used in calling one of preset station numbers P10
to P30. When the key is pressed, “ PRESET ” is displayed, the
LED segment g of units order digits lights and that of tens
order digit flickers.
Flickers (for 5 seconds at 1 Hz)
MZ 2584 20
PU: Output with pull-up MOS
Pin Functions OD: Open-drain output
No. of When
ae Power supply pin
Ee ee ee cr
ean oe ee Initial reset at RES="LOW”
fOosc1 | +1 + ~+| =I] Pins to constitute the main system clock oscillation circuit.
amen all Goal External clock is input to OSC1 with OSC2 opened.
With built-in feedback resistor.
P-ch high with- Pull-down resistor
a Pins to constitute the sub clock oscillation circuit.
stand voltage and existence/non-
a External clock is input to X1 with X2 opened. With built-in
large current type existence (bit-wise)
feedback resistor and damping resistor
a FL display tube digit exclusive output.
Display RAM fixed address output for static mode.
$8 ~S11 P-ch high with- Pull-down resistor | L
stand voltage and existence/non-
large current type existence (bit-wise)
7 ae
ve | 1 _| — | Fl display tube output pull-down resistor loadpowerinput | _—~+| SiS
PAo~PAs i 1/O | 1/O in units of bit or unit of 4 bits Input of key scan low- +15 V withstand PU or OD for each
FL display tube digit/segment output.
Display RAM fixed address output for static mode.
Pull-down resistor
existence/non-
existence (bit-wise)
FL display tube segment exclusive output.
Display RAM fixed address output for static mode.
P-ch high with-
stand voltage and
large Current type
threshold type with a function to automatically read the key voltage and medi- bit
scan data into RAM. um current type
PBo~PBs Built-in comparator of 4 independent channels.
Reference voltage selectable between external and internal.
Input
function
stopped
Input in units of bit or unit of 4 bits.
At low-speed mode (1/32 mode, sub clock mode), input function
is stopped.
1/O in units of bit or unit of 4 bits
+15 V withstand ® PU or OD for L (option)
PCo~PC3 4 1/0
4 voltage and large each bit
current type @ Output when
resetting
PDo~PD3 /O | 1/O in units of bit or unit of 4 bits +15 V withstand @ PU or OD for L (option)
voltage and large each bit
current type ® Output when
resetting
PEo~PE2 I/O in units of bit or unit of 3 bits +15 V withstand PU or OD for each H |
PEo/Vrero Used with external reference input of PB1-PB3 | voltage and bit
PE./Vner1 Used with external reference input of PBO medium current
PE2/START Used with HALT control START type only of PE2.
Normal withstand
voltage and
medium current
type of others.
PFo~PF3 1/0 [/O in units of bit or unit of 4 bits +15 V withstand PU or OD for each H
PF,/SIO Used with serial input S10 voltage and bit
PF,/SOO Used with serial output SOO medium current
PF2/SCKO Used with serial clock 1/0 SCKO type
PF3/INTO Used with INTO interrupt input
PGo~PG3 4 1/0 1/O in units of bit or unit of 4 bits +15 V withstand PU or OD for each H
PGd/SI; Used with serial input S!1 voltage and bit
PG,/SO1 Used with serial output SO1 / medium current
PG2/SCK1 Used with serial clock 1/O SCK1 type
PG3/INT1 Used with INT1 interrupt input
PHo~PHs3 0 I/O in units of bit or unit of 4 bits +15 V withstand PU or OD for each H
PHo/DACO Used with 6-bit PWM D/A output | voltage and bit
PH,/DAC1 Used with 8/14-bit PWM D/A output medium current |
PH2/SQR Used with square wave pulse output type |
PH3/HCNT Used with horizontal sync detection input
e MZ 2585