5
KDC-225/225MR/2025
MICROCOMPUTER'S TERMINAL DESCRIPTION
SYSTEM MICROPROCESSOR : 784225GC233A (X25 : IC1)
Pin No.
Pin Name
I/O
Description / Processing Operation
1
TUN SMETER
I
S meter detection input terminal
2
RDS NOISE
I
FM noise detection input terminal
3
LINE MUTE
I
Phone Muting signal input terminal (More than 2.5V : NAVI mute, Less than 1.0V : TEL mute)
4AVSS
-
GND
5L RST
O
Reset signal output (for LCD driver)
H : Light on display, key scan, L : Light out on display, key reset
6L CE
O
CE output for LCD driver IC
7AVREF1
-
BU5.0V
8L DATAL
I
DATA input terminal from LCD derive IC
9L DATAS
O
DATA output terminal to LCD driver IC
10
L CLK
O
CLK output terminal to LCD driver IC
11
TDF DET
I
Panel assy detect terminal
H : Panel assy come off
12
AUX ON
O
Select for AUX input signal
H : AUX, L : Other
13
RDS QUAL
I
RDS decoder QUAL signal input terminal
14
RDS DATA
I
RDS decoder Data signal input terminal
15
PWIC BEEP
O
Beep audio signal output terminal
16
LX DATA S
I
DATA signal input from EXT. unit
17
LX DATA M
O
DATA signal output to EXT. unit
18
LX CLK
I/O
CLK signal input/output to EXT. unit
19
TUN SCL
O
I2C CLK signal output terminal (for front-end)
20
TUN SDA
I/O
I2C DATA signal input/output terminal (for front-end)
21
TUN IFC OUT
I
IFC signal input terminal
H : Station detect, L : No detect
22
RDS AFS
O
Time constant select terminal (for noise detect)
H : Receiving, L : FM seek, AF search
23
CD SDA
I/O
I2C DATA output terminal (for CD mechanism, electric VR)
24
AUD SDA
O
CLK output terminal (for CD mechanism, electric VR)
25
NC
-
NC
26
LX RST
O
Reset signal output to EXT. unit
27
LX CON
O
Control signal output to EXT. unit
H : ON L : OFF
28
LX MUTE
I
Request signal input terminal from EXT. unit
L : Mute ON
29
LX REQ M
O
DATA signal output to EXT. unit
30
PWIC SVR
O
SVR control for Audio power IC
31
PWIC STBY
O
STBY control for Audio power IC
H : Power IC ON
32
PWIC MUTE
O
Muting control for Audio power IC
33
VSS1
-
GND
34
ACC DET
I
ACC detection input terminal
L : ACC detect
35
RESET2
O
Reset output terminal
L : Active
36
MUTE
O
Muting signal output terminal
37
BU DET
I
BU detect input terminal
L : BU detect
38
PARK SW
I
Packing condition detect terminal
H : OFF, L : ON (PARKING)
39
PS2 1
O
Power supply IC control terminal
