Sony ICF-CD855V Service Manual page 32

ICF-CD855V
• IC Pin Function Description
MAIN BOARD IC401 µPD789477GC-A39-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name
1, 2 NC
3 to 5 VLC2 to VLC0
6 to 9 COM0 to COM3
10 to 37 SEG0 to SEG27
38 AVDD
39 FSEQ
40 CD OPEN
41 DRF
42 VERSION
43 to 46 KEY3 to KEY0
47 AVSS
48 R CLK
49 AC IN
50 WRQ
51 MUTE
52 BUZZER
53 CD DATA-IN
54 CD DATA
55 CD CLK
56 CD CE
57 R DATA
58 XRST
59 R CE
60 POWER ON
61
ALARM A BUZ
62
ALARM A RADIO
63 ALARM A CD
64 VOL CLK
65 VOL DAT
66
ALARM B BUZ
67 ALARM B RADIO
68
ALARM B CD
69 IC
70 XT1
71 XT2
72 VDD0
73 VSS0
74 X1
75 X2
76 RESET
77 AMUTE
78 RADIO ON
79 CD ON
80 NC
32
I/O
— Not used
— Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
O Common drive signal output to the liquid crystal display
O Segment drive signal output to the liquid crystal display
— Power supply terminal (+3.3V) (analog system)
I CD synchronizing signal detection signal input from the digital signal processor
I CD lid open/close detect switch input terminal "L": CD lid is closed, "H": CD lid is opened
I CD focus on/off detection signal input from the digital signal processor
I Setting input terminal for destination
I Key input terminal (A/D input)
— Ground terminal (for analog system)
O PLL serial data transfer clock signal output to the FM/AM PLL
I Power detection signal input terminal when connected AC power adapter (A/D input)
I CD interruption signal input from the digital signal processor
O Tuner muting on/off control signal output to the FM/AM PLL "L": muting on
O Beep sound signal output terminal
I Serial data input from the digital signal processor
O Serial data output to the digital signal processor
O Serial data transfer clock signal output to the digital signal processor
O Chip enable signal output to the digital signal processor
O PLL serial data output to the FM/AM PLL
O System reset signal output to the digital signal processor "L": reset
O PLL chip enable signal output to the FM/AM PLL
Power on/off control signal output terminal for the power amplifier
O
"L": standby mode, "H": power amplifier on
O LED drive signal output terminal for ALARM A BUZZER indicator
O LED drive signal output terminal for ALARM A RADIO indicator
O LED drive signal output terminal for ALARM A CD indicator
O Serial data transfer clock signal output to the electrical volume
O Serial data output to the electrical volume
O LED drive signal output terminal for ALARM B BUZZER indicator
O LED drive signal output terminal for ALARM B RADIO indicator
O LED drive signal output terminal for ALARM B CD indicator
— Ground terminal
I Sub system clock input terminal (32.768 kHz)
O Sub system clock output terminal (32.768 kHz)
— Power supply terminal (+3.3V)
— Ground terminal
I Main system clock input terminal (4.19 MHz)
O Main system clock output terminal (4.19 MHz)
System reset signal input from the reset signal generator "L": reset For several hundreds msec.
I
after the power supply rises, "L" is input, then it changes to "H"
O Audio muting on/off control signal output terminal "L": muting on
O Power on/off control signal output for the tuner section "L": tuner power on
O Power on/off control signal output for the CD section "L": CD power on
I Not used
Description