Port Allocations; Cpu; Expander - Icom IC-A210 Service Manual

3-5 PORT ALLOCATIONS

• CPU (F: IC4)
Pin Line
No. name
1 EC [EC] key. (pulled up)
2 DIAL [DIAL] key. (pulled up)
3 BEEP Beep audio.
4 MONI [VOL] switch. (push)
7 PTT1_0 External [PTT1/2] keys.
15 RESET Reset signal from the reset IC (F: IC3).
Regulator control signal to the +16V
19 REG_C2 regulator (M: IC75).
"Low"=ON
24 INCOM_0 External intercom switch (pulled up).
Clock frequency shift signal to system
25 SFT
clock oscillator (F: Q6).
34–
V3–V0 Power supply for EL display (F: DS11).
37
40 SCK Serial clock to the EEPROM (F:IC5).
Phase-A signal from rotary encoder (S1;
43 SDN1
innner).
Phase-B signal from rotary encoder (S1;
44 SUP1
innner).
Phase-A signal from rotary encoder (S1;
45 SDN2
outer).
Phase-B signal from rotary encoder (S1;
46 SUP2
outer).
52 DATA_IC11 Serial data to the LED driver (F: IC15).
53 CLK_IC12 Serial clock to the LED driver (F: IC15).
54–
A–C I/O setting signals to the logic IC (M: IC49). O
56
Common serial clock/data output to MAIN
57 CDC
UNIT control siganal.
67– EL display driver (F: IC6, IC7) control data
D0–D15
82 bus.
88 REM_0 External [REMOTE] key. (pulled up)
89 RSSI RSSI signal from the FM IF IC (M: IC39).
90 NOISE Noise signal from the FM IF IC (M: IC39).
VOX (pilot side) signal from the VOX
91 VOX1
detector (M: IC3, D16).
VOX (co-pilot side) signal from the VOX
92 VOX2
detector (M: IC3, D17).
93 VR Volume level from the VR (VR UNIT; R1).
Luminescence level from light sensor (F:
94 PHOTO
IC9, D2).
Unlock signal from PLL IC (M: IC47).
95 UL
"Low"=PLL unlocked.
96 SWAP [ ] key. (pulled up)
97 RCL [RCL] key. (pulled up)
98 MEM [MEM] key. (pulled up)
99 DUAL [DUAL] key. (pulled -up)
Description I/O
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• EXPANDER (M: IC48)
Pin Line
No. name
TX voltage line control signal to the 8T2 switch
8 SEND (M: Q32).
"Low"=While transmitting.
TX VCO control signal to the VCO switch (M: Q2).
9 VCO1
"High"=TX VCO is selected.
RX VCO control signal to the VCO switch (M: Q3).
10 VCO2
"High"=RX VCO is selected.
RX mode toggling signal to the AM/FM switch
11 AM/FM (M: Q48).
"Low"=AM mode is selected.
1st IF fi lter (M: FI3, BW=20 kHz) select signal.
12 FIL1
"Low"=FI3 (BW=20 kHz) is selected.
1st IF fi lter (M: FI4, BW=9 kHz) select signal.
13 FIL2
"Low"=FI4 (BW=9 kHz) is selected.
AF mute signal to the MUTE SW (M: Q58,
14 MM Q59).
"High"=AF line is muted.
ANL circuit control signal to the ANL switch (M: IC70).
16 ANL
"Low"=ANL function is activated.
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Description