Port Allocations - Icom IC-M23 Service Manual

4-5 PORT ALLOCATIONS

• CPU (IC360)
PIN LINE
No. NAME
1 BEEP Beep audio (Squarewave).
2 PS PLL power save mode control.
Decoded tone signal. (for monitoring
3 TDEC
purpose)
4 DASTB Strobe for the D/A converter.
5 PLSTB Strobe for the PLL IC.
Serial data for the PLL IC and D/A
10 SDATA
converter.
Serial clock to the PLL IC and D/A
11 SCK
converter.
12 ESCK Serial clock for the EEPROM.
13 ESDA Serial clock from/to the EEPROM.
25 RES CPU reset.
27 TEMPV Temparature sensing voltage.
28 BTEMPV Battery temparature sensing voltage.
29 LOINV Lock voltage from the PLL IC.
30 TDETV TX power sensing voltage.
31 BATTV Battery voltage. (Divided voltage)
32 RSSIV RSSI voltage from the IF demodulate IC.
Noise level sensing voltage from the
33 NOISV
IF demodulate IC.
34 DCV Input voltage detection.
36 WDECV* Weather alart tone signal.
38 ATIS** ATIS signal.
51– SEG0-
LCD driver segment terminals.
72 SEG21
77 LEDS Backlight control.
78 CRESET Charging control IC reset.
79 LCDS LCD contrast control.
MIC mute SW control.
80 MICMS
L=MIC mute.
MIC control.
81 ATX
H=While transmitting.
AF power AMP control.
85 AFVS
H=While the squelch is opened.
86 V3VS VCO power supply control.
87 M3VS Main power supply control.
TX power control.
88 LOW
H=The TX power is set to Low.
R3V line control.
89 R3VS L= W h i l e r e c e i v i n g . ( R X c i r c u i t s
activated)
T3V line control.
90 T3VS L= While transmitting. (TX circuits
activated)
97 PON Main power supply line control.
RX AF line mute.
98 DETMS
L=Mute.
Charge status.
99 LEDI-R L=While charging.
Pulse=Charging error.
Charge status.
100 LEDI-G
L=When the battery is fully charged.
*: M24 only **: [FRG] and [HOL] only
DESCRIPTION
PIN LINE
I/O
No. NAME
O
101 PTTM
O
103 PTTIN
O
O 106 LOW
O
107 TXMS
O
108 16/9
O
109 CH/WX
O
I/O
110 UP
I
I
111 DOWN
I
I
112 FAV
I
113 VOL/SQL
I
I
114 SCAN
I
116 H/L
I
I
117 UNLK
O
O
119 PWSW
O
O
• D/A CONVERTER (IC190)
O
PIN LINE
O
No. NAME
1, 2 FCON Reference frequency adjustment voltage.
O
3, 4 PCON TX output power adjustment voltage.
9, 10 MODC Deviation adjustment.
O
11, 12 MSENS MIC signal level (MIC sensitivity) adjustment.
O
13, 14 VOLO AF output power adjustment.
O
15, 16 SQLO Squelch threshould level adjustment.
O 21, 22 T1CON BPF tuning voltage.
O
O
O
O
I
I
4 - 4
DESCRIPTION
MIC mute control.
L=MIC mute.
[PTT] input.
H=Pushed.
TX power control.
H=TX power is set to low.
Transmitting control.
H=TX mute.
[16/9] input.
L=Pushed.
[CH/WX] input.
L=Pushed.
[Y] input.
L=Pushed.
[Z] input.
L=Pushed.
[FAV] input.
L=Pushed.
[VOL/SQL] input.
L=Pushed.
[SCAN] input.
L=Pushed.
[H/L] input.
L=Pushed.
P L L u n l o c k s i g n a l i n p u t . ( P L L
malfunction detection)
H=PLL unlocked.
[ ] input.
H=Pushed.
DESCRIPTION
I/O
O
I
O
O
I
I
I
I
I
I
I
I
I
I