Icom IC-F51 - Manual (Page 12)

4 - 6
4-6-2 MAIN CPU (FRONT unit; IC401)
Input port for the PTT switch detection
signal.
Low: While the PTT switch is
pushed.
Input ports for the key return A/D sig-
nals.
Input port for the detect signal for con-
necting battery pack’s voltage.
Input port for the PLL lock voltage.
Input port for the S-meter signal from
the FM IF IC (MAIN unit; IC1, pin 12).
Input port for the transceiver’s internal
temperature detecting signal.
Input port for the optional microphone
determine signal.
Input port for the PLL unlock signal.
Low: The PLL circuit is unlocked.
Outputs serial data control signal to
the base band IC (MAIN unit; IC10, pin
14)
Output single tone encoder signal.
Outputs the cloning data signal.
Input port for the cloning data signal.
Input port for the receiving MSK detec-
tion signal from the base band IC
(MAIN unit; IC10, pin 12)
Output the CTCSS/DTCS signals.
• Outputs strobe signals to the D/A
convertor (IC6, pin 6).
• Input port for the connecting battery
type detect signal.
Output common signal to the LCD dis-
play.
PTT
KR1
KR0
BATV
LVIN
RSSI
TEMP
OPTV
ULCK
MDIR
SENC3–
SENC0
CLO
CLI
MRDF
CENC2–
CENC0
DAST
COM4–
COM1
45
46
47
48
49
50
51
52
55
71
72–75
76
77
78
79–81
82
88–91
1–11,
13,
15–25,
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
43
44
SEG23–
SEG13,
SEG12,
SEG11–
SEG1
SO
SCK
MDIO
MSCK
SCST
PLST
ESDA
ESCL
SCAT
EXSF
EXSM
EXOE
BEEP
MTDT
MTCK
NOIS
SDEC
CDEC
Output segment data to the LCD dis-
play.
Outputs serial data to the PLL IC
(MAIN unit; IC6, pin 8) and D/A con-
vertor (MAIN unit; IC6, pin 8).
Outputs serial clock signal to the PLL
IC (MAIN unit; IC4, pin 9), D/A conver-
tor (MAIN unit; IC6, pin 7), etc.
I/O port for the serial data signals
from/to the base band IC (MAIN unit;
IC10, pin 11).
Outputs clock signal to the base band
IC (MAIN unit; IC10, pin 13).
Outputs strobe signals to the scram-
bler IC (MAIN unit; IC14, pin 11).
Outputs strobe signals to the PLL IC
(MAIN unit; IC4, pin 11).
I/O port for data signals from/to the
EEPROM (IC409, pin 5).
Outputs clock signal to the EEPROM
(IC409, pin 6).
• Outputs power down control signal to
the scrambler IC (MAIN unit; IC14,
pin 12).
• Input port for the detection signal
whether the scrambler unit is
installed or not.
Outputs strobe signals to the expander
IC (IC410, pin 2).
Outputs strobe signals to the expander
IC (MAIN unit; IC12, pin 1).
Outputs the enable signal to the
expander ICs (IC410, pin 15 and MAIN
unit; IC12, pin 15).
Outputs beep audio signals.
Outputs MSK data for transmitting to
the base band IC (MAIN unit; IC10, pin
10).
Input port for the transmitting MSK
clock signal from the base band IC
(MAIN unit; IC10, pin 9).
Input port for the noise signal from the
FM IF IC (MAIN unit; IC1, pin 13).
Input port for single tone decode signal
from the base band IC (MAIN unit;
IC10, pin 21).
Input port for CTCSS/DTCS signal
from the amplifier (MAIN unit; IC5, pin
8).
Pin Port
Description
number name
Pin Port
Description
number name