Port Allocations - Icom IC-F3021S Service Manual

5-5 PORT ALLOCATIONS

5-5-1 CPU (IC22)
Pin Port
No. Name
KR1−
1−3 Input ports for dealer-programmable keys.
KR3
KS0−
4−8 Output ports for dealer-programmable keys.
KS4
9 BUSY Outputs "BUSY" signal to the DSP UNIT.
10 CCS Outputs chip-select signal to the DSP UNIT.
Outputs serial clock signal to the PLL IC (IC2, pin 9)
11 SCK
and D/A converter (IC12, pin 7/IC23, pin 7).
19− CENC0−
Output ports for CTCSS/DTCS signal.
21 CENC2
Outputs S5V line control signal to the S5V
22 S5C regurator (Q23).
"Low"=While power save mode.
Outputs T5V line control signal to the T5V line
26 T5C regurator (Q24, Q49).
"Low"=While transmitting.
Outputs R5V line control signal to the R5V line
27 R5C regurator (Q25).
"Low"=While receiving.
31 PLST Outputs PLL strobe signal to the PLL IC (IC2, pin 11).
Input port for PLL unlock detect signal from the
34 ULCK PLL IC (IC2, pin 7).
"Low"=While the PLL circuit is unlocked.
Outputs transmit mute signal to the transmit mute
35 TMUT switch (Q46).
"High"=Transmitting is muted.
Input port for [SIDE1] key (S5).
36 MONI
"Low"=While the key is pushed.
Input port for top switch (S1).
37 EMER
"Low"=While the switch is pushed.
39 DSDA Outputs serial data to the D/A converter (IC23, pin 6).
43 SENC Outputs DTMF signals to the LPF (IC6, pin 3).
Outputs beep sounds to the D/A converter (IC12,
44 BEEP
pin 21).
45 SDEC Input port for DTMF signals.
46 CDEC Input port for CTCSS/DTCS signals.
48 BATV Input port for remaining battery power.
49 LVIN Input port for VCO lock voltage.
Input port for receive signal strength level signal
50 RSSI
from the FM IF IC (IC9, pin 12).
Input port for CPU reset signal from the reset IC
59 RES (IC8, pin 1).
"Low"=When the CPU is reset.
Outputs CPU clock shift signal to the clock shift
69 CSFT
switch (D6).
Outputs AF power amplifi er (IC15) control signal to
the AF power amplifi er controller (Q41, Q42, D21,
70 AFON
D23).
"High"=The AF power amplifi er is ON.
Outputs strobe signal to the D/A converter (IC12,
71 DAST
pin 6).
Outputs CTCSS/DTCS select signal to the tone
72 DUSE fi lter switch (Q40).
"High"=While DTCS is in use.
Input port for noise signal from the FM IF IC (IC9,
75 NOIS
pin 13).
82 ESDA Outputs serial data to the EEPROM (IC10, pin 5).
85 ESCL Outputs clock signal to the EEPROM (IC10, pin 6).
Description
Pin Port
No. Name
Outputs Analog/Digital select signal to the A/D
89 DIGI switch (D2, D3).
"High"=Digital mode is selected.
91 LSO Outputs serial data to the LCD driver (IC20, pin 48).
92 LSCK Outputs clock signal to the LCD driver (IC20, pin 47).
Outputs chip-enable signal to the LCD driver (IC20,
93 LCS
pin 46).
Outputs display inhibit signal to the LCD driver
94 LINH
(IC20, pin 45).
Outputs LCD backlight control signal to the
95 LIGT backlight LED's (DS1, DS2) driver (Q45).
"Low"=While the backlight is ON.
Outputs AF mute signal to the analog switch (IC3,
96 RMUTE pins 12, 13).
"Low"=While the squelch is close or transmitting.
Outputs MIC signals mute signal to the analog
97 MMUTE switch (IC3, pin 5) and MIC mute switch (Q31).
"Low"=While receiving.
Outputs serial data to the PLL IC (IC2, 10) and D/A
99 SSO
converter (IC12, pin 8).
100 KR0 Input ports for dealer-programmable keys.
5-5-2 D/A CONVERTER (IC12)
Pin Port
No. Name
Outputs level-adjusted MIC signals to the MIC mute
2 MCGO
switch (Q31).
10,
Outputs modulation signal to the modulation circuits
MOD
16 (D2).
Outputs reference frequency control voltage to the
14 REF
reference frequency oscillator buffer (IC7, pin 13).
Outputs modulation balance control signal to the
15 BAL
reference frequency oscillator buffer (IC7, pin 12).
Outputs beep sounds to the AF volume buffer (IC6,
22 BEEPO
pin 9).
Outputs level-adjusted AF signals to the noise filter
23 SQLC
(IC9, pins 7, 8,
5-5-3 D/A CONVERTER (IC23)
Pin Port
No. Name
• While receiving
Outputs BPF tuning voltage to the tunable BPF
(D19, D25, L7, L8, C21−C23, C25, C27−C29).
1 T1
• While transmitting (as "APC" signal)
Outputs transmit mute signal to the transmit mute
switch (Q46).
Outputs BPF tuning voltage to the tunable BPF
2 T2 D14, D15, L9, L11, C19, C36, C39−C41,
(
C44, C45
Outputs oscillating frequency adjust voltage to the
3 TXLVA
Q16, D10, D13 )
TX VCO (
Outputs oscillating frequency adjust voltage to the
4 RXLVA
Q17, D9, D11 )
RX VCO (
5 - 6
Description
Description
R42, R44−R46, C69, C70, C413
Description
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