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Kenwood CS-434HU Service Manual page 4

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CS-434HU/HC
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin
Pin name
I/O
31,32
NC
O
33
SYS ON
O
34
RESET
35
XT1
36
XT2
O
37
REGC
38
X2
39
X1
40
VSS
41
VDD
42
NC
O
43
PON D
O
44~50
NC
O
51
AUDIO
O
52~57
NC
O
58
BVDD
59
BVSS
60~72
NC
O
73
REF CON
O
74
AVDD
75
AVSS
76
Avref
77~89
NC
90
ILL DET
91
DISC EJ
92
SYS ACC
93
BU DET
94~96
NC
O
97
SDA0
O
98
NC
O
99
SCK0
O
100
MUTE
O
4
Description
Not used
System control
I
System reset input
I
Not used
Not used
I
-
Main system clock oscillation terminal
I
Main system clock oscillation terminal
-
GND potential
-
5V potential
Not used
Power ON (digital)
Not used
Audio output switching
Not used
-
5V potential
-
GND
Not used
A/D port standard voltage output
-
5V potential
-
GND
I
A/D port standard voltage input
I
Not used
I
Illumi detection from H/U
I
DISC eject request
I
ACC detection from H/U
I
BU detection
Not used
EEPROM DATA
Not used
EEPROM CLK
Audio mute output
Processing Operation
System ACC ON "H"
System ACC OFF "L"
System ACC ON "H"
Reset "L"
Reset voltage: 4.1V
12.582MHz
12.582MHz
System ACC ON "L"
System ACC OFF "H"
When a surrounding power supply "H"
Audio output "L"
Audio not output "H"
System ACC ON "H"
Others "L"
Always "L"
Illumi ON "L"
Illumi OFF "H"
EJECT "L"
ACC ON "H"
ACC OFF "L"
BU ON "L"
BU OFF "H"
For EEPROM communication
For EEPROM communication
Mute output "L"
Mute not output "H"

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