Ic Pin Function Description - Sony HCD-EP505 Service Manual

HCD-EP505
Ver 1.1

6-18. IC PIN FUNCTION DESCRIPTION

• DISPLAY BOARD IC301 µPD780306GC-A68-8EU (SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER)
Pin No. Pin Name
1 to 4 KEY2 to KEY5
5 ANALYZER
6 STATION
7 RDSDATA
8 AVDD
9 AVREF
10, 11
CDOUT1, CDOUT2
12 VSS
13 TIME
14 CDDATA
15 CDRESET
REC-EN
16
17 INPINENA
18 REC-LED
19 SOUNDENA
20 PLLENA
21 MUTE
22 POWER
23 to 26 COM0 to COM3
27 BIAS
28 to 30 VLC0 to VLC2
31 VSS
32 to 61 SEG0 to SEG29
62 SEG30
63 SEG31
64 SEG32
65
SEG33
66
SEL10
67 SEG35
68
SEL12
69
SEG37
70
SEL14
71
SEL15
72
DATAIN
73
DATAOUT
74
CLK
75
EEPROMDATA
76
STEREO
77
EEPROMCLK
34
I/O
I Key input terminal (A/D input)
I Analyzer level detection signal input terminal (A/D input) Not used
I Tuning detection signal input terminal
I Serial data input from the RDS decoder (Used for the AEP, UK models)
— Power supply terminal
I Reference voltage input terminal
O Not used
— Ground terminal
O LED drive signal output terminal
I/O Two-way data bus with the CD block
O Reset signal output to the CD block "L": reset
O REC bias control signal output terminal
O Mega bass on/off selection signal output terminal "H": mega bass on
O LED drive signal output terminal
O chip enable signal output foe the LC75392
O PLL chip enable signal output to the FM/AM PLL "H" active
O Audio line muting on/off control signal output terminal "H": muting on
O System power on/off control signal output terminal "H": power on
O Common drive signal output to the liquid crystal display
O Bias output for the liquid crystal display drive
Input terminal for doubler circuit capacitor connection to develop liquid crystal display drive
I
voltage
— Ground terminal
O Segment drive signal output to the liquid crystal display
Segment drive signal output to the liquid crystal display
I/O AM frequency select switch input terminal
(AM frequency select switch: used for the except AEP, UK, chinese models)
Segment drive signal output to the liquid crystal display
I/O AM frequency select switch input terminal
(AM frequency select switch: used for the except AEP, UK, chinese models)
Segment drive signal output to the liquid crystal display
O Segment drive signal output to the liquid crystal display Not used
I Head position detect switch input terminal "L": reverse direction, "H": forward direction
O Segment drive signal output to the liquid crystal display Not used
I Cassette tape detect switch input terminal "L": no cassette, "H": cassette in
O Segment drive signal output to the liquid crystal display Not used
Rec-proof claw (forward direction) detection signal input from the protect detect switch
I
"L": recording possible, "H": protect
Rec-proof claw (reverse direction) detection signal input from the protect detect switch
I
"L": recording possible, "H": protect
I Serial data input from the FM/AM PLL
O Serial data output to the FM/AM PLL and LC75392
O Serial data transfer clock signal output to the FM/AM PLL and LC75392
I/O Two-way data bus with the EEPROM
I FM stereo detection signal input terminal "L": stereo
O Clock signal output to the EEPROM
Description