Port Allocations - Icom IC-M2A Service Manual

4-5 PORT ALLOCATIONS

4-5-1 CPU (IC360)
Pin Port
number name
1 LCDC1
Outputs LCD contrast control signal.
2 LCDC2
3 BEEP Outputs beep audio signals.
Input port for unlock signal.
5 UNLK
High : PLL is unlocked.
Input port for battery's type and
cloning cable connecting detection.
7 BTYPE
Low : While alkaline cell battery is
Outputs RF band-pass filters control
signal.
High :
8 BPFS
Low :
16 SCK Outputs serial clock.
Outputs strobe signal to the PLL IC
17 PLST
(IC1, pin 3).
18 SDATA Outputs serial data.
Outputs strobe signal to the D/A con-
19 DAST
vertor IC (IC190, pin 6).
Outputs key pad back light control sig-
nal.
20 LEDK
High : While key pad back light is
Outputs LCD back light control signal.
21 LEDL
High : While LCD back light is ON.
I/O port for the EEPROM (IC340, pin
23 ESDA
5) serial data signals.
Outputs the V5 regulator control sig-
24 V5VS
nal.
Outputs the T5 regulator control sig-
25 T5VS
nal.
Outputs the R5 regulator control sig-
26 R5VS
nal.
Outputs the AF regulator control sig-
27 AFVS
nal.
28 CLIN Input port for the cloning signal.
29 CLOUT Outputs the cloning signal.
Output the speaker mute switch con-
30 IVOLM trol signal.
High : While the AF output is muted.
Input port for the [H/L] key.
51 HL
Low : While [H/L] key is pushed.
Input port for the [SQL] key.
52 SQL
Low : While [SQL] key is pushed.
Input port for the [Y] key.
53 UP
Low : While [Y] key is pushed.
Description
used in the battery case.
While receiving below
159.990 MHz.
While receiving above
160.000 MHz.
ON.
Pin Port
number name
54 DOWN
55 16CH
56 CHWX
57 SCAN
58 DW
83 5VS
84 MICM
85 DETM
86 WET
88 WXTV
91 BATTV
93 TEMPV
94 RSSIV
95 PTT
4-5-2 D/A converter IC (IC190)
Pin Port
number name
2 FCON
3 PCON
10 MCON
11 BEPO
14 BEPST
15 SQLO
4 - 4
Description
Input port for the [Z] key.
Low : While [Z] key is pushed.
Input port for the [16] key.
Low : While [16] key is pushed.
Input port for the [CH/WX] key.
Low : While [CH/WX] key is pushed.
Input port for the [SCN] key.
Low : While [SCN] key is pushed.
Input port for the [DW] key.
Low : While [DW] key is pushed.
Outputs 5V regulator control signal.
Outputs the MIC mute switch control
signal.
Low : While muted.
Outputs the detector mute control sig-
nal.
Low : While muted.
Input port for transceiver's internal
inundation detection.
Input port for WX tone detection.
Input port for the battery voltage
detection.
Input port for the transceiver's internal
temperature detection.
Input port for the RSSI signal from the
FM IF IC (IC170, pin 12) to detect
receving signal strength.
Input port for the [PTT] switch.
High : While [PTT] switch is pushed.
Description
Output signal to adjust the reference
frequency.
Output signal to adjust TX power.
Output signal to adjust modulation
while transmitting.
Output signal to adjust beep tone level
while "AUTO" is selected in set mode.
Output signal to adjust beep tone level
while 1–10 scale is selected in set
mode.
Output signal to adjust squelch level.