Microcomputer's Terminal Description - Kenwood KRC-31Y Service Manual

KRC-31Y/36/366L/37/Y
/391/394/Y/466R/4904Y

MICROCOMPUTER'S TERMINAL DESCRIPTION

Microcomputer : UPD780058GCxxx (X14 : IC1)
Pin No. Pin Name I/O
1 DSI O
2 PANEL
3 -
4 AVSS
5 L-RST O
6 L-CE O
7 AVREF1
8 -
9 PLL-DATA I/O
10 PLL-CLK O
11 L-DATA L
12 L-DATA S O
13 L-CLK O
14 R-DATA
15 R-QUAL
16 CH-DATA C
17 CH-DATA H O
18 CH-CLK I/O
19 M-STBY
20 T-END
21 ACC-DET
22 BU-DET
23 IC2 TYPE 0
24 IC2 TYPE 1
25 TYPE 0
26 TYPE 1
27 TYPE REF O
28 MOTOR O
29 PLL-CE O
30 SD
31 ASF O
32 LO/DX O
33 VSS1
34 P-MUTE O
35 SVR O
36 -
37 IC2-SCL O
38 IC2-SDA I/O
39 MUTE O
40 P-STBY O
4
Function / Operating Condition
DSI control.
I Panel detection. "L" : Panel exists
- -
- GND.
LCD driver reset.
LCD driver chip enable.
I Reference voltage.
- -
Front-end communication data.
Front-end communication clock.
I LCD driver communication data.
LCD driver communication data.
LCD driver communication clock.
I RDS data.
I RDS QUAL.
I Changer communication data.
Changer communication data.
Changer communication clock.
Cassette tape standby detection.
I
"H" : Standby
I Tape end detection. "H" : Run, "L" : Stop
I ACC detection.
I Backup detection.
I For service. "L" : Normally
I For service. "L" : Normally
I Destination discrimination.
I Destination discrimination.
Reference voltage for destination
and service.
Cassette mechanism motor.
"H" : ON, "L" : OFF
Front-end communication ship enable.
Station detection. "H" : Station exists,
I
"L" : Station does not exist
Noise detection time constant switch.
Local seeking switch. "H" : LO, "L" : DX
- GND.
Power amplifier muting.
SVR control.
- -
E-volume communication clock.
E-volume communication data.
Muting control.
Power amplifier standby.
Pin No. Pin Name I/O
41 P. CON-DET I P. CON short-circuited detection.
42 CH-CONT O Changer control.
43 - - -
44 CH-REC H O Changer request.
45~47 - - -
48 EN2-1 O Power supply IC control.
49 EN2-0 O Power supply IC control.
50 BEEP O Buzzer.
51 EN3 O Power supply IC control.
52 EN1 O Power supply IC control.
53 SW 5V O P. ON 5V control. "H" : OFF, "L" : ON
Tape signal detection. "H" : Signal
54 MUSIC I
does not exist, "L" : Signal exists
tape advanced sensitivity control.
55 MS-CONT O
"H" : Play, "L" : FF/REW
56 EQ-MUTE O Cassette tape muting. "H" : ON, "L" : OFF
Cassette tape runing direction detection.
57 FWD/REV I
"H" : FWD, "L" : REV
58 SUB+ O Sub motor control.
59 SUB- O Sub motor control.
60 RESET I System reset.
61 REMOTE I Remote control.
62 R-CLK I RDS clock.
63 CH-REQ C I Changer request.
64 PACK-IN I Cassette tape pack-in detection.
65 KEY-REQ I Key signal detection.
66 - - -
67 VSS0 - GND.
68 VDD1 - VDD.
69 X2 - Main system clock.
70 X1 I Main system clock.
71 IC - -
72 - - -
73 XT1 - VDD.
74 VDD0 - VDD.
75 AVREF 0 I Reference voltage.
SD detection.
76 S-METER I
"H" : SD exists, "L" : SD does not exist
77 T-MODE I Cassette tape mode detection.
Navi mute : Over 2.5V,
78 PHONE I
Tel mute : Less tha 2.5V
79 NOISE I Noise detection during FM mode.
80 AV CONT O reference voltage.
Function / Operating Condition