Kenwood KDC-HD942U Service Manual page 9

MICROCOMPUTER'S TERMINAL DESCRIPTION
● Panel μ-COM: IC1 on X16- (SWITCH UNIT)
Pin No. Pin Name
1 REMO
2-5 NC
6 BYTE
7 CNVSS
8 LED CONT LEFT BLUE
9 LED CONT LEFT RED
10 RESET
11 XOUT
12 VSS
13 XIN
14 VCC1
15 NMI
16 LED CONT LEFT GREEN
17 LED CONT RIGHT BLUE
18 LED CONT RIGHT RED
19 LED CONT RIGHT GREEN
20 LED CONT TRI RED
21 LED CONT TRI GREEN
22 LED CONT LCD
23 NC
24 LED CONT RTY2
25 NC
26 LED CONT RTY1
27,28 NC
29 PAN DATA
30 SYS DATA
31 SYS REQ
32 PAN REQ
33 LCD SDA
34 NC
35 LCD SCK
36 LCD RST
37 LCD CD
38 LCD CS
39 ROM COR DET
40-43 NC
44 FLASH CE
45-50 NC
I/O Application
I Remote control signal input
- Not used
- GND
-
O Blue key (left side) output
O Red key (left side) output
- Reset
- Resonator
- GND
- Resonator
- Power supply (5V)
- Not used
O Green key (left side) output
O Blue key (right side) output
O Red key (right side) output
O Green key (right side) output
O Triangle-red turning-on SW PWM output
O Triangle-green turning-on SW
O LCD back-light PWM output
- Not used
O LED rotary (MULTI-key side) PWM output
- Not used
O LED rotary (VOL-key side) PWM output
- Not used
O Data transmission from panel
I Data reception from system μ-com
I System μ-com communication request input
O Panel communication request output
O LCD data
- Not used
O LCD clock
O LCD reset
O LCD CD
O LCD CS
I ROM correction writing mode
- Not used
I Chip enable for fl ash ROM rewriting
- Not used
KDC-HD942U
Truth Value
Processing / Operation / Description
Table
Pulse width detection
Output L fi xed
Connects to GND
Not used
Not used
H: Normal, L: Reset
12MHz
Connects to GND
12MHz
Connects to PAN5V
Input fi xed
Not used
Not used
Not used
Not used
H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
Not used
H: Turned ON, L: Turned OFF,
PWM frequency: 23kHz
Output L fi xed
H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
Output L fi xed
H: Turned ON, L: Turned OFF,
PWM frequency: 100Hz
Output L fi xed
H: Data communication
H: Data communication
Outputs LCD SDA
Output L fi xed
Outputs LCD SCK
Normal: H, Reset: L
L: Control data, H: Display data
Outputs LCD CS
H: ROM correction rewritable
(I2C opened)
Output L fi xed
Output L fi xed
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