Read Sony XR-4890 Service Manual online
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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
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
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