Port Allocations - Icom IC-M32 Service Manual

4-5 PORT ALLOCATIONS

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