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