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KRC-17G/YA/YG, 194A/G/YA/YG, 266LA/LG/RG
KRC-27YA/YG, 2904YA/YG, 294A/G/YA/YG
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MICROCOMPUTER'S TERMINAL DESCRIPTION
3 7 63 1515 0
SYSTEM MICROCOMPUTER UPD780058GC (IC1 : X14)
Pin No. Pin Name I/O
1
PANEL
I
2
L CE
O LCD driver chip enable. -
3
L RES
O LCD driver reset.
4
AVSS
-
5
R DATA
I
6
R QUAL
I
7
AVREF 1
-
8
IC2 SEL 1
I
9
IC2 SEL 0
I
10
-
-
11
L DATA L
I
12
L DATA S O LCD driver communication data. -
13
L CLK
O LCD driver communication clock. -
14,15
-
-
16
DATA C
I
TE
L 13942296513
17
DATA H
O Changer communication data. -
18
CH CLK
I
19-26
-
-
27
MOTOR
O Cassette tape motor SW. -
28
FF/REW
I
29-31
-
-
32
SD
I
33
VSS 1
-
34
-
-
35
PLL CLK O Front-end communication clock. -
36
PLL DATA I/O Front-end communication data. -
37
AM +B
O AM power supply SW. -
38
FM +B
O FM power supply SW. -
39
IC2 DATA I/O E-volume communication data. -
40
IC2 CLK
O E-volume communication clock. -
www
41
AFC
O FM noise detection / Time constant SW. -
42
MUTE
O Mute control.
.
43
AMP MUTE
O Power amplifier mute. -
44
-
-
45
CH CNT
O Changer control.
4
Function
Operating Condition
Panel detection.
"L" : Panel exists.
-
GND.
-
RDS data.
-
RDS receiving.
-
Reference voltage.
-
Selector.
"L" : Normally.
Selector.
"L" : Normally.
-
-
LCD driver communication data. -
-
-
Changer communication data. -
Changer communication clock. -
-
-
Cassette tape FF/REW detection. "L" : FF or REW works.
-
-
"H" : Signal exists.
Signal detection.
"L" : Signal does not exist.
GND.
-
-
-
x
ao
y
-
i
-
-
-
8
Pin No. Pin Name I/O
46
REQ H
O Changer request.
47
-
-
48
SVR
O SVR control.
49
AMP STBY O Power amplifier stand-by. -
50
BEEP
O Buzzer signal output.
51,52
-
-
53
P.CONT
O Power control SW.
54
ACC DET
I
55
B.U. DET
I
56
P.ON
O Power SW.
57
ILLUMI
O Illumination SW.
58
FWD/REV
I
59
-
-
60
RESET
I
61
SEL 1
I
Q Q
3
6 7
1 3
62
R CLK
I
63
REQ C
I
64
PACK IN
I
65
KEY-REQ
I
66
SEL 0
I
67
VSS 0
-
68
VDD 1
-
69
X2
-
70
X1
I
71
IC
-
72
-
-
73
XT1
-
74
VDD 0
-
75
AVREF 0
I
76
S METER
I
77
PHONE
I
u163
.
78
NOISE
I
79
AV CONT O A/D converter reference voltage. -
80
-
-
2 9
9 4
2 8
Function
Operating Condition
-
-
-
-
-
-
-
ACC detection.
-
Back-up detection.
-
-
-
Cassette mechanism FWD/REV detection. -
-
-
System reset signal input. -
Destination SW.
-
1 5
0 5
8
2 9
9 4
RDS clock.
-
Changer request.
-
Cassette tape pack-in detection. -
Key signal input detection. -
Destination SW.
-
GND.
-
5V power supply.
-
Main system clock.
-
Main system clock.
-
GND.
-
-
-
5V power supply.
-
5V power supply.
-
A/D converter reference voltage. -
"H" : S-meter exists.
S-meter detection.
"L" : S-meter does not exist.
m
Navigation mute : 2.5V or more.
-
co
Telephone mute : 1V or less.
FM noise detection.
-
-
-
9 9
2 8
9 9
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