Port Allocations - Icom IC-F33GT Service Manual

5-6 PORT ALLOCATIONS

5-6-1 D/A CONVERTOR IC (IC12)
Pin Port
Number name
Outputs the modulation balance level
10 BAL control signal. The signal is applied to
the buffer amplifi er (IC24, pin 1).
Outputs the TX VCO lock voltage
14 TLVA
control signal.
Outputs the RX VCO lock voltage
15 RLVA
control signal.
Outputs the bandpass filter tuning
T1 control signal . The output signal is
22
applied to the bandpass fi lters (D19,
D240).
• Outputs the bandpass filter tuning
control signal . The output signal is
applied to the bandpass fi lters (D14,
23 T2 D15).
• Outputs the TX control signal . The
output signal is applied to the APC
amplifi er (IC2, pin 1).
5-6-2 CPU (MAIN unit; IC22)
Pin Port
number name
13, 15, CENC0– Output the CTCSS/DTCS signals.
16 CENC2
Outputs the reference oscillator cor-
29 REF recting voltage. The voltage is applied
to the buffer amplifi er (IC24, pin 3)
Outputs strobe signals to the PLL IC
30 PLST
(IC21, pin 16).
Outputs the FM/PM modulation
34 PMFM switching signal to the FM/PM switch
(IC13, pin 5).
I/O port for the serial data signals
35 MDIO from/to the base band IC (IC14,
pin 11).
Outputs clock signal for the base
36 MSCK
band IC (IC14, pin 13).
Outputs serial data control signal to
37 MDIR
the base band IC (IC14, pin 14).
Input port for transmitting MSK clock
38 MTCK signal from the base band IC (IC14,
pin 9).
Outputs MSK data for transmitting to
39 MTDT
the base band IC (IC14, pin 10).
Input port for the receiving MSK de-
40 MRDF tection signal from the base band IC
(IC14, pin 12).
Outputs strobe signals to the D/A
41 DAST
convertor (IC12, pin 6).
43 SENC Output single tone encoder signal.
44 BEEP Outputs beep audio signals.
Input por t for single tone decode
45 SDEC signal from the base band IC (IC14,
pin 21).
Description
Description
Pin Port
Number name
46 CDEC
48 BATV
49 LVIN
50 RSSI
51 TEMP
69 CSFT
70 AFON
74 PTT
75 NOIS
76 SO
78 SCK
79 CLI
80 CLO
82 ESDA
84 MUTE
85 ESCL
86 S5C
87 T5C
88 R5C
89 TMUT
90 ULCK
4 - 6
Description
Input port for CTCSS/DTCS signal
from the amplifi er (IC19, pin 1).
Input port for the detect signal for
connecting battery pack's voltage.
Input port for the PLL lock voltage.
Input port for the S-meter signal from
the FM IF IC (IC9, pin 12).
Input port for the transceiver's internal
temperature detecting signal.
Outputs shift signal for reference os-
cillator's frequency.
Outputs audio control signal.
Low: While outputs audio signals
from the speaker.
Input port for the PTT switch detec-
tion signal.
Low: While the PTT switch is
pushed.
Input port for the noise signal from
the FM IF IC (IC9, pin 13).
Outputs serial data to the PLL IC
(IC21, pin 15) and D/A conver tor
(IC12, pin 8).
Outputs serial clock signal to the PLL
IC (IC21 pin 14), D/A convertor (IC12,
pin 7), etc.
Input port for the cloning data signal.
Outputs the cloning data signal.
I/O port for data signals from/to the
EEPROM (IC10, pin 5).
Outputs AF control signal .
Low: While Squelch ON.
Outputs clock signal to the EEPROM
(IC10, pin 6).
Outputs the S5 regulator (Q26–Q28)
control signal.
Low: While the S5 regulator out-
puts 5 V voltage.
Outputs the T5 regulator (Q24) con-
trol signal.
Low: While transmitting.
Outputs the R5 regulator (Q25) con-
trol signal.
Low: While receiving.
Outputs the transmitting mute switch
control signal to the mute switch
(Q 501).
High: While muting.
Input port for the PLL unlock signal.
Low: The PLL circuit is unlocked.