Read Sony CDX-M20 Service Manual online
CDX-M20
CDX-M20
15
15
• IC Pin Function Description
MAIN BOARD IC501 R5F3650KBDZ80FA (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
LCD_SO
O
Serial data output to the liquid crystal display driver
2
LCD_CLK
O
Serial data transfer clock signal output to the liquid crystal display driver
3
NOSE_SW
I
Front panel remove/attach detection switch input terminal “L”: front panel is attached
4
SIRCS
I
SIRCS signal input from the remote control receiver
5
NCO
O
Not used (open)
6
NCO
O
Not used (fi xed at “L”)
7
NCO
O
Not used (open)
8
BYTE
I
External data bus width selection signal input terminal Fixed at “L” in this unit
9
CNVSS
I
Processor mode selection signal input terminal
“L”: normally operation, “H”: fl ash writing mode
“L”: normally operation, “H”: fl ash writing mode
10
XIN
I
Sub system clock signal input terminal (32.768 kHz)
11
XOUT
O
Sub system clock signal output terminal (32.768 kHz)
12
RESET
I
System reset signal input from the reset signal generator “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it change to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it change to “H”
13
OSCOUT
O
Main system clock signal output terminal (7.92 MHz)
14
VSS
-
Ground terminal
15
OSCIN
I
Main system clock signal input terminal (7.92 MHz)
16
VCC1
-
Power supply terminal (+3.3V)
17
NMI
I
Non-maskable interrupt signal input terminal Fixed at “H” in this unit
18
RC_IN1
I
Rotary commander shift key signal input terminal
19
BUIN
I
Back-up power detection signal input terminal
20, 21
NCO
O
Not used
22
DEC_SI
I
Serial data input from the CD mechanism deck block
23
DEC_SCK
O
Serial data transfer clock signal output to the CD mechanism deck block
24
DEC_SO
O
Serial data output to the CD mechanism deck block
25, 26
NCO
O
Not used
27
DRV_ON
O
Driver control signal output to the CD mechanism deck block
28
BEEP
O
Beep sound signal output to the power amplifi er
29
I2C_SCL
O
IIC communication serial clock signal output to the power amplifi er, electrical volume and
EEPROM
EEPROM
30
I2C_SDA
I/O
IIC communication serial data input/output with the power amplifi er, electrical volume and
EEPROM
EEPROM
31
FW_TXD
O
Serial data output terminal for fl ash writing
32
FW_RXD
I
Serial data input terminal for fl ash writing
33
FW_CLK
I
Serial data transfer clock signal input terminal for fl ash writing
34
FW_BUSY
O
Busy signal output terminal for fl ash writing
35
XM_TX
O
Serial data output to the SIRIUSXM input connector
36
XM_RX
I
Serial data input from the SIRIUSXM input connector
37
XM_POWER_EN
O
Power supply enable signal output to the SIRIUSXM input connector
38
MEC_LOAD
O
Motor drive signal (for loading direction) output to the CD mechanism deck block
39
MEC_EJECT
O
Motor drive signal (for eject direction) output to the CD mechanism deck block
40
CDON_1500MV
O
Power supply control signal output terminal for servo section
41
EPM
O
EPM signal output terminal Fixed at “L” in this unit
42
MEC_INSW
I
Disc insert detection signal input from the CD mechanism deck block
43
MEC_LIMIT
I
Limit in detection signal input from the CD mechanism deck block
44
MEC_DSW
I
Chucking end detection signal input from the CD mechanism deck block
45
DEC_INT
I
Interrupt request signal input from the CD mechanism deck block
46
CE
I
Clip enable signal input terminal Fixed at “H” in this unit
47
HIT2_SDA
I/O
Serial data input/output with the FM/AM tuner unit
48
HIT2_SCL
O
Serial data transfer clock signal output to the FM/AM tuner unit
49
HIT2_RESET
O
Reset signal output to the FM/AM tuner unit “L”: reset
50
DEC_XMUTE
O
Muting signal output to the CD mechanism deck block
51
CD_ZDET
I
Zero detection signal input from the CD mechanism deck block
52
CD_XCCE
O
Chip enable signal output to the CD mechanism deck block
53
DEC_SSTBY
O
Standby signal output to the CD mechanism deck block
54
DEC_RST
O
Reset signal output to the CD mechanism deck block
55, 56
NCO
O
Not used
Pin No.
Pin Name
I/O
Description
57
ACC_IN
I
Accessory power detection signal input terminal
58
ATT
O
Audio muting control signal output terminal
59
DIAG
I
Condition signal input from the power amplifi er
60
AMPSTB
O
Standby signal output to the power amplifi er
61
NCO
I
Not used
62
VCC2
-
Power supply terminal (+3.3V)
63
NCO
O
Not used
64
VSS
-
Ground terminal
65 to 74
NCO
O
Not used
75
MEC_SELFSW
I
Self loading position detection switch input terminal Not used
76 to 78
NCO
O
Not used
79, 80
DEBUG_1, DEBUG_2
O
Not used
81
RE-IN1
I
Jog dial pulse signal input from the rotary encoder (B phase input) (for volume)
82
RE-IN0
I
Jog dial pulse signal input from the rotary encoder (A phase input) (for volume)
83
SAIN
I
DC input from the electrical volume
84 to 88
NCO
O
Not used. (Open)
89
SADATA
O
Serial data output to the electrical volume
90
SACLK
O
Serial data transfer clock signal output to the electrical volume
91
KEYACK0
I
Key acknowledge detection signal input terminal for the rotary commander key entry
92
KEYACK1
I
Key acknowledge detection signal input terminal for the front panel key entry
93
NCO
O
Not used
94, 95
KEYIN1, KEYIN0
I
Front panel key signal input terminal
96
AVSS
-
Ground terminal (for A/D converter)
97
RC_IN0
I
Rotary commander shift key input terminal
98
AVRH
-
Reference voltage terminal (+3.3V) (for A/D converter)
99
AVDD
-
Power supply terminal (+3.3V) (for A/D converter)
100
LCD_CE
O
Chip enable signal output to the liquid crystal display driver
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