Microcomputer's Terminal Description - Kenwood KDC-HD942U Service Manual

MICROCOMPUTER'S TERMINAL DESCRIPTION

● System μ-COM: IC602 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O
1 WIRED REMO I
2 NC -
3 CD SYS DATA O
4 CD CD DATA I
5 CD CD CLK I
6 BYTE -
7 CVVSS -
8 XCIN -
9 XCOUT -
10 RESET -
11 XOUT -
12 VSS -
13 XIN -
14 VCC1 -
15 NMI -
16 NC -
17 FLIP DET I
18 BU DET I
19 NC -
20 PAN RST O
21 SRC KEY I
22 PANEL DET I
23 EJECT KEY I
24 NC (SYNC) -
25 DSI (EJECT ILL) I/O DSI control
26 PWIC BEEP O
27 HR I2C SCL O
28 HR I2C SDA O
29 PAN SYS DATA O
30 PAN PAN DATA I
31 PAN SYS REQ O
32 PAN PAN REQ I
33,34 NC -
35 HD RST O
36 CD DISC12 SW I
37 CD LOS SW I
38 M STOP O
39 ROM COR DET I
39 ROM COR EPM I
40 CD MUTE I
41 CD CD REQ I
42 M RST O
Application
Remote control signal input
Not used
Data from system μ-com to Bolero
Data from Bolero to system μ-com
Clock from Bolero
Resonator
Resonator
Resonator
Resonator
Not used
Not used
Panel-opened detection for fl ip-down panel
Back-up detection
Not used
Panel reset
Source key input
Panel connector detached/attached detection
Eject key input
Not used
Beep output
I2C communication
I2C communication
Data from system μ-com to panel
Data from panel to system μ-com
Communication request from system μ-com to panel
Communication request from panel to system μ-com
Not used
HD μ-com reset
12cm disc detection
CD loading detection
Mechanism stop
ROM correction writing request
Becomes EPM input when ROM collection is written
Mechanism mute request
Communication request from mechanism to system
μ-com
Mechanism reset
KDC-HD942U
Truth Value
Processing / Operation / Description
Table
Pulse width detection
Output L fi xed
32.768kHz
32.768kHz
12MHz
12MHz
Output L fi xed
H: Opened, L: Closed
BU found: L, No BU or momentary power-
down or over-voltage: H
Output L fi xed
H: Normal, L: Reset
H: OFF, L: ON
L: Panel detached, H: Panel attached
H: OFF, L: ON
Output L fi xed
L: Turned ON, Hi-Z: Turned OFF
2kHz / 1kHz
MAX 400kHz
MAX 400kHz
UART MAX 500kHz
UART MAX 500kHz
Output L fi xed
L: Normal, H: HD reset
L: 12cm disc
L: Eject completed
H: Normal, L: SOC stopped
H: ROM correction rewritable (I2C opened)
Rewritable in Lo at the start-up
L: Mute request, H: Normal
H: Normal, L: Reset
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