Q Q
5-7. IC PIN FUNCTION DESCRIPTION
3 7 6 3 1 5 1 5 0
• MAIN BOARD IC401 µPD789407AGK-A21-9EU (SYSTEM CONTROL/LCD DRIVER)
Pin No.
Pin Name
I/O
−
1
VDD1
System power supply
2
BIAS
O
LCD bias output
−
3–5
VLC0–2
LCD drive power supply
−
6
VSS1
Ground
7–10
COM0–3
O
LCD drive common signal
11–26
COM3–15
O
LCD drive segment signal
−
27
NC
Not used
Ι
28–30
VERSION0–2
Initialization input
−
31
NC
Not used
Ι
32–34
KR01–3
Key return signal
Ο
35–38
KS0–3
Key strobe signal
−
39
AVDD
Analog power supply
−
40
AVREF
A/D converter reference voltage
41–45
KR0–4
I
Key return signal
46
KR00
I
Key return signal
−
47
DOOR IN
CD lid open/close detection
48
AVSS
I
Analog ground
49
C SCOR
I
Sub code sync input
50
C SENS2
I
CD SENS2 input
51
AC IN
I
Power failure detection
52
C SENS1
O
CD SENS1 input
53
BUZZER
O
Buzzer input
54
C SQSO
O
Sub code Q 80-bit serial output
T E
55
C MUT
L
O
CD mute
1 3 9 4 2 2 9 6 5 1 3
56
C SQCK
O
CK for reading sub code Q 80-bit
57
C RST
O
CD reset output
58
AMUT
O
Audio muting output
59
DC ON
O
CD ON output
60
RADIO ON
O
Radio ON output
61
R DATA
O
Radio data output
62
R CLK
O
Radio CLK output
63
R LAT
O
Radio LAT output
64
POWER ON
O
Power ON output
65
SHIFT0
O
Serial clock output 0
66
SHIFT1
I
Serial clock output 1
67
RESET
O
Serial reset input
68
X2
I
Main system clock output
−
69
X1
Main system clock input (4.19 MHz)
−
70
VSS0
Ground
Ο
71
VDD0
System power supply
Ι
72
XT2
Sub system clock output
−
73
XT1
Sub system clock input (32 kHz)
Ο
74
IC
Normally, not used. (Used for writing)
Ο
75
C CLK
CD CLK output
Ο
76
C LAT
CD LAT output
−
77
C DATA
CD data output
w w w
−
78–80
NC
Not used.
Description
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a o
y
.
i
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5-8. IC BLOCK DIAGRAMS
8
IC1
CXA1238M-T6
30
29
28 27
VCO
MONO/ST
SELECT
1
2
3
4
Q
Q
3
7
6
3
IC51
BU2614FS-E2
16
PHASE DET
1
u 1 6 3
.
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2
4
9
9
8
26 25 24 23 22 21
20
19
18
FM FRONT-END
AM FRONT-END
REG
MPX REG.
1/2
PD1
COUNTER
1/2
PD2
COUNTER
AUTOBLEND
MUTING
BAND PASS
MUTE
RIPPLE
DECODER AMP
FILTER
5
6
7
8
9
10
11
1
5
1
5
0
8
9
2
4
15
14
13
12
10
11
COUNT
MAIN CTL
PRESCALER
OUT PUT CTL
I/O CTL REDISTER
2
3
4
5
6
7
m
c o
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2
9
9
17
16
FM IF/
DISCRI
AM
IF/DET
TUNING
INDICATOR
12
13 14 15
9
8
2
9
9
9
IF
8