Icom IC-F50 Service Manual page 50

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