Icom IC-RX7, Service Manual Addendum

Page: 40 / 64

4 - 5
4-6 CPU PORT ALLOCATION
Pin
No. LINE
NAME
DESCRIPTION I/O
1 KR0 Key matrix. I
2 PCON
+3V line SW
"L"=Power ON
O
3 TCON
Tone fi lter (L: IC12) SW
"L"=Filter activated.
O
4–7 KS0–KS3 Key matrix. I
8 TREBLE_B
Tone control circuit SW.
"H"=Treble-B
O
9 BASS_B
Tone control circuit SW.
"H"=Bass-B
O
10 ESIO EEPROM data I/O. I/O
11 ECK EEPROM clock. O
13 TREBLE_C
Tone control circuit SW.
"H"=Treble-C
O
15 BASS_C
Tone control circuit SW.
"H"=Bass-C
O
16 TRUTH
AF fi lter (L: Q20) by-pass SW.
"H"=FM mode.
O
17 SHIFT
RX frequency shift.
"L"=200 MHz RX.
O
18 LCK DAC (L: IC16) clock. O
19 AM
AF line SW (M: IC9) control.
"L"=Receiving in AM mode.
O
20 AGCC
AGC function switching.
"L"=AGC activated.
O
21 WFM
RX mode switching (phase shifter
switching; discriminator/LC resonator).
"H"= WFM mode.
O
22 ANTSW
AM broadcast antenna switching.
"L"=Internal bar antenna.
O
23 B2C
RF circuit (BC band) control.
"L"=BC band RX (Ext. LOCAL antenna).
O
24 B1C
RF circuit (SW band) control.
"L"=SW band RX (Ext. DX antenna).
O
25 ATT
Attenuator (M: D2, R2 to 4) control.
"L"=Attenuator ON.
O
26 NOISE Detected noise level (D/A value). I
27 800MC
RF circuit (800 MHz band) control.
"L"=800 MHz band RX.
O
28 GC
RF circuit (1 GHz band) control.
"L"=1 GHz band RX.
O
29 UHFC
RF circuit (UHF band) control.
"L"=UHF band RX.
O
30 EAR
Earphone antenna control.
"L"=Earphone antenna activated.
O
34 DUD [DIAL] (rotary encoder; L S21) I
35 DCK [DIAL] (rotary encoder; L S21) I
36 LDATA DAC (L: IC16) data. I
37 CKO
CPU clock signal to converter (L: IC11,
D24–27).
O
38 POWER [POWER] key. I
39 DATAC Common data to the buffer (L: IC1). O
40 LIGHT
LCD backlight driver (L: Q5) control.
"H"=Backlight (L: DS10 to 12) ON.
O
41 AFON
AF power AMP SW (L: Q11, 12) control.
"H"=AF power AMP (L: IC9) ON.
O
44 BEEP Beep sounds (square waves). I
45 RSSI RSSI voltage (A/D value). I
46 RTONE Demodulated tone signals. I
Pin
No. LINE
NAME
DESCRIPTION I/O
47 CTONE Demodulated tone signals. I
48 VSCAF
Filtered demodulated signal (extracted
voice signal).
I
49 CHG
Charge status.
"H"=While pre/fast charging.
I
50 TEMP
Internal temparature according divided
voltage by thermister (L: R189)
I
51 BATTI Battery voltage input (AD value). I
52 HVIN
DC input voltage monitor (divided
voltage of HV line).
I
59 RESET CPU reset signal. I
70
CPU
CLOCK
SHIFT
CPU clock frequency shift. O
71 VCO1
VCO switching signal.
"L"= VCO1 activated (=receiving
510–
741 MHz
).
O
72 VCO2
VCO switching signal.
"L"= VCO1 activated (=receiving
283–
510 MHz/1130–1368 MHz ).
O
73 VCO3
VCO switching signal.
"L"= VCO1 activated (=receiving
83.5–
283 MHz/950–1130 MHz
).
O
74 VCO4
VCO switching signal.
"L"= VCO1 activated (=receiving
0.15–
83.5 MHz/741–950 MHz ).
O
75 BDET
Battery pack attachment detect.
"L"=Battery pack is attached.
I
76 LCDDT Serial data to the LCD (L: DS13). O
77 LCDCS Serial data to the LCD (L: DS13). O
78 LCDCK Serial clock to the LCD (L: DS13). O
79 CL_OUT Cloning data. O
80 CL_IN Cloning data. I
83 DASTB Strobe to the DAC (L: IC16). O
84 VRSTB Strobe to the VR IC (L: IC10). O
85 PCK PLL clock. O
86 PLDATA PLL data. O
87 PSTB1 PLL (1st VCO UNIT; IC3) strobe. O
88 PSTB2 PLL (2ND VCO UNIT; IC1) strobe. O
89 PS
Power save mode control for PLL IC.
"L"=While in power save mode.
O
90 CHGC
Charge management IC (L: IC18) control.
"H"=While charging.
O
91 HVDET
HV line voltage detect.
"H"=3 V is applied.
I
92 CL_IN Cloning data. I
93 VHF_C
RF circuit (VHF band) control.
"L"=VHF band RX.
O
94 HFC
RF circuit (HF band) control.
"L"=HF band RX.
O
95 R3C
R3V line SW. (regurator (L: IC4) control
signal)
"H"= R3V line is ON. (the regulator is
enable)
O
96–
100
KR5–KR1 Key matrix. I