Sony XES-Z50, Service Manual, Page: 55 / 153

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MAIN BOARD IC502 MN18P83220S4K (TUNER CONTROLLER)
Pin No. Pin Name I/O Function
1 A5 O
2 A4 O
3 A3 O
4 A2 O
5 A1 O
6 A0 O
7 VDD — Power supply terminal (+5V)
8 X1 I Main system clock input terminal (8 MHz)
9 X2 O Main system clock output terminal (8 MHz)
10 GND — Ground terminal
11 XTI I Sub system clock input terminal Not used (open)
12 XTO O Sub system clock output terminal Not used (open)
13 EX1 I Input terminal for setting microcomputer operation mode (fixed at “L”)
14 RESET I
System reset signal input from the system controller (IC501) and reset signal generator (IC504)
“L”: reset For several hundreds msec. after the power supply rises, “L” is input, then it
changes to “H”
15 RDS CLK I Serial data transfer clock signal input from the external device Not used (fixed at “L”)
16 BU IN I Backup power supply detection signal input from the bus interface (IC503) (for SONY bus)
17 BUSON I Bus on/off detection interrupt signal input from the system controller (IC501) “L”: bus on
18 D7 I/O
19 D6 I/O
20 D5 I/O
21 D4 I/O
22 D3 I/O
23 D2 I/O
24 D1 I/O
25 D0 I/O
26 EEP SCK O Serial data transfer clock signal output to the EEPROM (IC516)
27 NCO O Not used (open)
28 BUSY-MA O Not used (open)
29 BUSY-TU O Not used (open)
30 EEP SDA I/O Two-way data bus with the EEPROM (IC516)
31 FM AMS IN I Not used (fixed at “L”)
32 AM ST IN I AM stereo detection signal input from the FM/AM tuner unit “L”: AM stereo
33 NCO O
34 NCO O Not used (open)
35 NCO O
36 NIL I Not used (fixed at “L”)
37 NIL I Not used (fixed at “L”)
38 PLL DI I PLL serial data input from the FM/AM tuner unit
39 PLL DO O PLL serial data output to the FM/AM tuner unit
40 PLL CKO O PLL serial data transfer clock signal output to the FM/AM tuner unit
41 PLL CE O PLL chip enable signal output to the FM/AM tuner unit
42 UNIREQ O
Communication request signal output to the bus interface (IC503) (for SONY bus)
“H”: communication request
43 LINK OFF O Bus on/off control signal output of the bus interface (for SONY bus) Not used (open)
Address signal output to the external RAM device Not used (open)
Two-way data bus with the external RAM device Not used (open)