Icom IC-F24/S Service Manual Addendum page 56

4-6-2 CPU (IC13)
Pin Port
number name
Input port for the transceiver's
1 TEMP internal temperature detecting
signal.
Input port for the detect signal
2 BATV for connecting battery pack's
voltage.
Input port for power reset signal.
7 RES
13 SENC0
Output single tone encoder
signal.
14 SENC1
Outputs DTSC LPF control
16 DUSE
signal.
Outputs AF power amplifier
18 AFON
control signal.
19 SENC2
Output single tone encoder
signal.
20 SENC3
21 CBI0
Input ports for rotary selector.
22 CBI1
23 CENC0
24 CENC1 Output CTCSS/DTCS signals.
25 CENC2
26 CBI2
Input ports for rotary selector.
27 CBI3
Outputs serial clock signal to
28 SCK the PLL IC (IC4, pin 9), D/A
convertor (IC6, pin 7), etc.
Outputs serial data to the PLL IC
29 SO (IC6, pin 8) and D/A convertor
(IC6, pin 8).
30 BEEP Outputs beep audio signals.
I/O port for data signals from/to
31 ESDA
the EEPROM (IC15, pin 5).
Outputs clock signal to the
32 ESCL
EEPROM (IC15, pin 6).
Input port for unlock signal from
33 UNLK
PLL IC.
Outputs strobe signals to the
34 PLST
PLL IC (IC4, pin 11).
Output/input por t for wide/
36 NWC
narrow control signal.
• Outputs strobe signals to the
37 DAST
• Input port for the connecting
Outputs power save control
38 S5C
signal.
Outputs T5 regurator control
39 T5C signal.
Low: While transmitting
Outputs R5 regurator control
signal.
40 R5C
Low: While receivinging
Description
D/A convertor (IC8, pin 6).
battery type detect signal.
Pin Port
number name
42 RLED Outputs receiving LED control signal.
Outputs transmitting LED control
43 TLED
signal.
44 OPT3
I/O ports for option unit.
45 OPT1
46 OPT2
Input port for the PTT switch detection
47 PTT signal.
Low : While the PTT switch is pushed.
48 SI Serial Bus inputport.
49 CLI Input port for the cloning data signal.
50 CLO Outputs the cloning data signal.
Input port for the noise signal from the
53 NOIS
FM IF IC (MAIN unit; IC1, pin 13).
54 CIRQ Input port for option unit detection.
55 CCS Outputs chip select signal.
56 TMUT Outputs transmit mute signal.
Input port for AF mute signal from the
57 RMUT
RX circuit.
58 MMUT Outputs MIC mute signal.
59 REMO Inputs key signal from remote mic.
Input port for CTCSS/DTCS signal
60 CDEC
from the amplifier (IC5, pin 8).
Input port for single tone decode
61 SDEC
signal from the LPF (IC5, pin 8).
62 KEY Inputs key input signal.
Input port for the S-meter signal from
63 RSSI
the FM IF IC (IC1, pin 12).
64 LVIN Input port for the PLL lock voltage.
4 - 6
Description