– 32 –
Pin No. Pin Name I/O Function
43 LCD CE O Chip enable output to the liquid crystal display driver (IC900)
44 LCD CLK O Serial data transfer clock signal output to the liquid crystal display driver (IC900)
45 NCO O Not used (open)
46 LCD SO O Serial data output to the liquid crystal display driver (IC900)
47 VDD2 — Power supply terminal (+5V)
48 AVDD — Power supply terminal (+5V) (for A/D converter)
49 AVREF+ I Reference voltage input terminal (+5V) (for A/D converter)
50 KEYIN1 I Key input terminal (A/D input) OFF, PTY, LOUD, 6/5/3/2/4/1 ATA keys input (S950 to 957)
51 KEYIN0 I
Key input terminal (A/D input) AF/TA, TUNER BTM, SEEK MANU +/–, DSPL, LEVEL +,
SEL, LEVEL – keys input (S920 to 927)
52 KEYSEL1 I Setting terminal for the key function (fixed at “L”)
53 KEYSEL0 I Setting terminal for the key function (fixed at “L”)
54 DSTSEL1 I Destination setting terminal (fixed at “L”)
55 DSTSEL0 I Destination setting terminal (fixed at “L”)
56 NIL I Not used (fixed at “L”)
57 FM VSM I FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU100)
58 AVREF– I Reference ground terminal
59 AVSS — Ground terminal (for A/D converter)
60 GND — Ground terminal
61, 62 NCO O Not used (open)
63 SEEK OUT O Seek control signal output to the FM/AM tuner unit (TU100)
64 TUN ON O Tuner system power supply on/off control signal output terminal “H”: tuner on
65 FM ON O FM system power supply on/off control signal output terminal “H”: FM on
66 MUTE O Line muting control signal output terminal “H”: line muting on Not used (open)
67 AF SEEK O
PLL low-pass filter time constant selection signal output at AF seek
“H” is output when AF seek
68 NCO O Not used (open)
69 NOSESW I Detects the removal of the attaching and removing type front panel block “L”: attaching
70 ST IN I/O
71 SD IN I
Station detector detect input from the FM/AM tuner unit (TU100)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
72 NIL I Not used (fixed at “L”)
73 PW SEL I
Power select switch input terminal
“L”: halt mode, “H”: operation mode Not used (fixed at “L” in this set)
74 to 78 NIL I Not used (fixed at “L”)
79 TEST I Setting terminal for the test mode “L”: test mode (normally fixed at “H”)
80 NIL I Not used (fixed at “L”)
Input of FM stereo detection signal from FM/AM tuner unit (TU100), and output of forced
monaural control signal to FM/AM tuner unit (TU100) (Commonly used for stereo display
input and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”
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