Sony ICF-S79 - IC Pin Function Descriptions; IC6 (μPD17071 GB-517-1 A7) Pin Functions; Band Select Signal Logic

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Pin No. Pin Name I/O Function
1 INIT OUT O
Initialize signal output for the destination select
2 POWER O
Radio power on/off control signal output “H”: power on
3 MUTE O
Mute on/off control signal output “L”: mute on
4 AL LEVEL O
Beep sound level variable output terminal Not used (open)
5NCO
Not used (open)
6 to 9 KS0 to KS3 O
Key strobe signal output terminal
10 to 13 KR0 to KR3 I
Key return signal input terminal
14 BAND1 O
Band select signal output terminal *1
15 BAND2 O
Band select signal output terminal *1
Used for ICF-S79L/S79V only (ICF-S79: not used (open))
16 V AMP —
Power supply terminal for buffer amplifier
17 NC O
Not used (open)
18 GND —
Ground terminal
19 EO O
PLL error signal output terminal
20 VCOL I
AM (MW) or LW VCO input terminal
21 VCOH I
FM, TV or WEATHER VCO input terminal
22 VREG1 —
Power supply terminal (connected to the coupling capacitor)
23 VDD —
Power supply terminal (+2.2 V)
24 XOUT O
System clock output terminal (75 kHz)
25 XIN I
System clock input terminal (75 kHz)
26 VREG2 —
Power supply terminal (connected to the coupling capacitor)
27 VLCD0 —
28 CAP0 —
29 CAP1 —
30 VLCD2 —
31 to 34 COM0 to COM3 O
Common drive signal output to the liquid crystal display (LCD1)
35 to 48 LCD0 to LCD13 O
Segment drive signal output to the liquid crystal display (LCD1)
49 LCD14 O
Segment drive signal output terminal Not used (open)
50 CE I
Power failure detection signal input from the IC5 Normally: “H”
51 INT I
Not used (fixed at “L”)
52 BEEP O
Beep sound drive signal output terminal
53 VDET I
Power failure detection signal input from the IC4 Normally: “H”
54 PB1 I
Initialize signal input for the destination select Fixed at “L”
55 PB2 I
Initialize signal input for the destination select
ICF-S79/S79L: initialize mode at “H”, ICF-S79V: fixed at “L”
56 PB3 I
Initialize signal input for the destination select
ICF-S79L: initialize mode at “H”, ICF-S79/S79V: fixed at “L”
MAIN BOARD IC6 µPD17071GB-517-1A7
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY CONTROLLER, KEY CONTROL)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive
voltage
*1 Band select signal
FM (TV L)
TV H/
WEATHER
AM (MW) LW
BAND1 (pin !¢)
“L” “L” “H” “H”
BAND2 (pin !∞)
“L” “H” “L” “H”
4-4. IC PIN FUNCTION DESCRIPTION