Cpu Port - Icom IC-R10 Service Manual

4-4
CPU PORT ALLOCATIONS
4-4-1
CPU
(IC1
on
the
LOGIC
unit)
CPU
(IC1)
—
continued
Pin
number
Port
name
Description
46
+3SC
Outputs control signal
for
the
+3S
regulator
circuit.
Low; During
PLL
unlock or
power
save.
48
VSCC
Outputs
VSC
control signals.
Low
:
When
the
VSC
function
is
ON.
49
MUTE
Outputs
AF
mute
switch (IC950)
control signals.
Low
;
While muted.
50
BEEP
Output port
for
beep
audio
signals.
51
AFONC
Outputs
a
control signal for
AF
amplifier regulator
circuit.
High:
When
squelch
is
open.
(FM
mode
only)
52-59
1/00-1/07
Ouput
ports
for
the
LCD
control data.
60
RESET
Input port
for
the reset
signal.
61
FUNG
Input port for
the
[FUNC]
switch.
Low
:
While
[FUNC]
switch
is
pushed.
62
POWSW
Input port for
the
[PWR]
switch.
Low: While
[PWR]
switch
is
pushed.
63
D-UD
Input port for
the [DIAL].
64
D-CK
65
SQL
Input port
for
the
main band
noise
signals.
66
S-SQL
Input port for
the
sub-band noise
signals.
73
UL
Input port for
PLL
unlock signal
from
the
PLL
ICs.
76
RSSI
Input port
for
the
main band
receive
signal strength level.
77
CENT
Input port for
the
AFC
control voltage.
78
B
Input port for
the
sub-band
receive
signal strength level.
79
BATT
Input port for
connected voltage low
battery detection.
80
n
Input port for
the
PLL
lock
voltage
information.
Pin
number
Port
name
Description
1
VSC
Input port for
VSC
detected signals.
High:
Unmodulated
or
beat
signals
are received.
Low
:
Modulated
signals
are
received.
3
BFOS2
Output
port
for
BFO
control signal.
Low
;
LSB/CW mode
(453.5
kHz)
High:
USB mode
(456.5
kHz)
5
VXO
Output
port for
VXO
frequency
control voltage.
6
TUNE
Outputs tunable
band pass
filter
control voltage.
8
CLIN
Input port
for
the cloning or Cl-V
control signals.
9
CLOUT
Output
port for
the cloning or
Cl-V
control signals.
10
BF03
Output
port
for
BFO
regulator control
signal.
Low
:
While
SSB/CW
mode
is
selected.
12
SDATA
Outputs
serial
data
signals to
the
PLL
ICs,
EEPROM
(LOGIC
unit,
1C41)
and
I/O
expander
ICs, etc.
13
SCK
Outputs
serial
clock signal
to
the
PLL
ICs,
EEPROM
(LOGIC
unit,
IC41)
and
I/O
expander
ICs, etc.
14
ISTB
Outputs strobe signals for
the
I/O
expander
ICs.
15
VSCS
Outputs
VSC-time constant
control
signal.
High:
While unmodulated
signal or
no
RF
signal
is
received
Low
:
While
receiving
modulated
signals.
16
ESO
Output
port for serial
data signals
to
the
EEPROM
1C
(LOGIC
unit,
IC41).
17 ESI
Input port for serial
data signals from
the
EEPROM
1C
(LOGIC
unit.
IC41).
18
ESCK
Output
port for
clock signal to
the
EEPROM
1C
(LOGIC
unit,
IC41).
19-22
KS0-KS3
Output strobe signals to
the key
matrix.
25,26
PSTB1
,
PSTB2
Output strobe signals
to
the
PLL
ICs.
27-31 K0-K4
Input ports
for
the
key
matrix.
32,
34 MO,
Ml
Input ports for
the
initial
matrix.
44
3LCON
Outputs control signal
for
the
+3C
and +3L
regulator
circuits.
High:
While
turning
power ON.
45
LAMPO
Outputs
LCD
and
key backlight
control signal.
Low
:
While
backlight
is
ON.