Sony XR-4880, Service Manual

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6-6. IC PIN FUNCTION DESCRIPTION
• IC501 MASTER U-COM (MN101C12GTC1)
Pin No.
1 VREF- – Basic voltage (- side) of AD conversion input
2 VSM I FM/AM common signal meter A/D conversion input terminal
3 KEYIN1 I
4 KEYIN0 I
5 DBASS IN I Position detecting AD input terminal of D-BASS
6 DSTSEL I Terminal for setting to select the value of destination
7 FUNC-SEL I Function selecting (AD conversion) input
8 – O Not used
9 RC-IN0 I Rotary commander (AD conversion) input
10 VREF+ I Basic voltage (+side) of AD conversion input
11 VDD – Power supply
12 OSC2 –
13 OSC1 –
14 VSS – Ground
15 XI –
16 XO –
17 MMOD GND – Ground
18 RC-IN1 I Rotary commander shift input
19 SYSRST O SYSTEM RESET control output
20 BUSON O BUS ON control output
21 UNISO O Serial data output
22 UNISI I Serial data input
23 UNICKO O Serial clock output
24 UNICKI I Serial clock input
25 – O Not used
26 KEYACK I Key input acknowledge
27 NOSESW I Removing/attaching front panel detection input
28 BU-IN I BACK-UP detection input terminal
29 SIRCS I Remote control input
30 TELMUT I TELEPHONE MUTE detection input
31 TEST-IN I Test mode setting input terminal
32 RAMBU I Reset detection input of RAM
33 RESET I Reset input terminal
34 VOL-MUT O Electrical volume mute control output
35 BEEP O Control output for buzzer
36 AMPMUT O Power amplifier mute control output terminal
37 AMPON O Power amplifier STANDBY control terminal
38 PLL-CKD O PLL CLK output terminal
39 PLL-CE O PLL CE output terminal
40 PLL-SO O PLL DATA output terminal
41 PLL-SI I PLL DATA input terminal
42 LCD-SO O LCD serial data output
43 LCD-CE O LCD chip enable output terminal
44 LCD-CKO O LCD serial clock output
45 VOL-SIO O Electrical volume serial data output
46 – O Not used
47 VOL-CKD O Electrical volume serial data output
48 ACC-IN I Accessory power supply detection input
49 MUT O System MUTE control output
Pin Name I/O Function
KEY (AD conversion) input
Radiator (18.432 MHz) connecting terminal
Sub clock (for clock) radiator (32 kHz) connecting terminal