Ic Pin Function Description; Ic Block Diagrams - Sony ICF-CD823 Service Manual
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Also See for ICF-CD823:
- Operating instructions (2 pages) ,
- Operating instructions (2 pages) ,
- Operating instructions (3 pages)
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5-7. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC401 µPD789407AGK (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
55
C MUT
O
CD mute
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
−
78–80
NC
Not used.
Description
— 25 —
5-8. IC BLOCK DIAGRAMS
IC1
CXA1238M-T6
30
29
28 27
26 25 24 23 22 21
VCO
MPX REG.
1/2
COUNTER
1/2
COUNTER
MONO/ST
MUTING
SELECT
DECODER AMP
1
2
3
4
5
IC51
BU2614FS-E2
16
15
14
PHASE DET
1
2
3
20
19
18
17
16
FM FRONT-END
AM FRONT-END
REG
FM IF/
DISCRI
AM
PD1
IF/DET
TUNING
PD2
INDICATOR
AUTOBLEND
BAND PASS
MUTE
RIPPLE
FILTER
6
7
8
9
10
11
12
13 14 15
13
12
10
9
11
COUNT
MAIN CTL
IF
PRESCALER
OUT PUT CTL
I/O CTL REDISTER
4
5
6
7
8
— 26 —
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