Read Sony CDX-R450 / CDX-R550 Service Manual online
39
CDX-R450/R550
Pin No.
Pin Name
I/O
Pin Description
53
TU ATT IN
I
Tuner mute zero cross detect signal input (CDX-R450 only)
54
BU IN
I
Back-up power supply detect signal input
55
NCO
O
Not used. (Open)
56
DAVN
I
RDS data block synchronized detect signal input (CDX-R450 only)
57
NCO
O
Not used. (Open)
58
UNISI
I
SONY bus data input
59
UNISO
O
SONY bus data output
60
UNISCK
O
SONY bus clock output
61
NCO
O
Not used. (Open)
62
NCO
O
Not used. (Open)
63
NCO
O
Not used. (Open)
64
SIRCS
I
Remote control signal input
65
NCO
O
Not used
66
NCO
O
Not used
67
NCO
O
Not used
68
FLASH W
I
Memory mode select signal input
69
NCO
O
Not used. (Open)
70
SYNCHRO SW
I
Synchro CD door open/close detect signal input
71
RC IN1
I
Rotary commander shift key signal input
72
ACC IN
I
Accessory power supply detect signal input
73
TEST IN
I
Test mode detect signal input
74
TELATT
I
Telephone attenuate detect signal input
75
ILLUIN
I
Illumination detect signal input
76
XKEYON
O
A/D converter power supply control signal output
77
RESET
I
CPU reset input
78
NCO
O
Not used. (Open)
79
XIN
I
Sub-clock input (32.768kHz)
80
XOUT
O
Sub-clock output (32.768kHz)
81
VSS1
—
Ground pin
82
OSC IN
I
Main-clock input (3.68MHz)
83
OSC OUT
O
Main-clock output (3.68MHz)
84
VCC3
—
Power supply pin (+3.3V)
85
DEMO SEL
I
Demo select signal input
86
ATT
O
Audio mute control signal output
87
BUSON
O
Bus ON signal output
88
SYSRST
O
System reset output
89
EJECT OK SW
O
Eject OK signal output
90
NCO
O
Not used. (Open)
91
NCO
O
Not used. (Open)
92
NCO
O
Not used. (Open)
93
Z-MUTE
I
Z-Mute signal input
94
NCO
O
Not used. (Open)
95
NCO
O
Not used. (Open)
96
NCO
O
Not used. (Open)
97
NCO
O
Not used. (Open)
98
CD ON
I
CD servo power control request signal input
99
CDM ON
I
CD deck power control request signal input
100
NCO
O
Not used. (Open)
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