Icom IC-M32 Service Manual - page 11
4 - 4
4-5 PORT ALLOCATIONS
4-5-1 CPU (IC360)
Pin
number
1
2
3
4
5
6
7
10
12
13
14
15
16
18
19
20
22
23
24
27
30
31
39
40
41
42
Port
name
RSSIV
NOISV
BATTV
TDETV
TEMPV
SCK
SDATA
LEDS
BEEP
PLST
DAST
5VS
LCDS
ESCK
CLIN
CLOUT
PWSW
UNLK
ESDA
TDEC
PTT
WET
SCAN
H/L
VOL
DOW
SQL
Description
Input port for the RSSI signal to con-
trol S-meter from the FM IF IC (IC170
pin 12).
Input port for the NOIS signal to con-
trol squelch circuit from the FM IF IC
(IC170 pin 14).
Input port for the battery voltage
detection.
Input port for the TX power detection.
Input port for transceiver’s internal
temperature detection.
Outputs serial clock.
Outputs serial data.
Outputs key pad and LCD back light
control signal.
High : While lights ON.
Outputs beep audio signals.
Outputs strobe signals to the PLL IC
(IC1, pin 3).
Outputs strobe signals to the D/A con-
vertor IC (IC190, pin 6).
Outputs the M5V regulator control sig-
nal.
Outputs LCD contrast signal.
Outputs serial clock signal for the
EEPROM (IC340, pin 6).
Input port for the cloning data.
Outputs the cloning data.
Input port for the power switch control
signal.
Input port for the PLL unlock signal.
High : PLL is unlocked.
I/O port for the serial data signals to
the EEPROM (IC340, pin 5).
Outputs the decode monitor signal.
High : While muting.
Input port for the [PTT] switch.
High : While the [PTT] switch is
pushed.
Input port for transceiver’s internal
inundation detection.
Input port for the [SCN] key.
Low : While the [SCN] key is
pushed.
Input port for the [H/L] key.
Low : While the [H/L] key is pushed.
Input port for the volume control sig-
nal.
Input port for the [SQL] key.
Low : While the [SQL] key is
pushed.
Pin
number
43
44
45
46
47
48
49
50
51
52
53
54
55
Port
name
CH/WX
UP
DOWN
16
AFMS
BPFS
V5VS
T5VS
R5VS
AFVS
MICM
DETM
VOL UP
Description
Input port for the [CH/WX] key.
Low : While [CH/WX] key is pushed.
Input port for the [Y] key.
Low : While the [Y] key is pushed.
Input port for the [Z] key.
Low : While the [Z] key is pushed.
Input port for the [16] key.
Low : While the [16] key is pushed.
Output the speaker mute switch con-
trol signal.
High : While the AF output is muted.
Outputs RF bandpass filters control
signal.
High :
While receiving below
159.990 MHz.
Low :
While receiving above
160.000 MHz.
Outputs the 5V regulator control sig-
nal.
Outputs the T5V regulator control sig-
nal.
Outputs the R5V regulator control sig-
nal.
Outputs the AF regulator control sig-
nal.
Outputs the MIC mute switch control
signal.
Outputs the detector mute control sig-
nal.
Low : While muting.
Input port for the volume control sig-
nal.
4-5-2 D/A converter IC (IC190)
Pin
number
2
3
10
11
14
15
Port
name
FCON
PCON
MCON
BEPO
BEPST
SQLO
Description
Outputs the reference frequency
adjusting signal.
Outputs the TX power adjusting sig-
nal.
Outputs the transmit modulation
adjusting signal.
Outputs the beep tone level adjusting
signal while “AUTO” is selected in set
mode.
Outputs the beep tone level adjusting
signal while 1–10 level is selected in
set mode.
Outputs the squelch level adjusting
signal.