Sony XES-Z50 Service Manual page 55

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