Kenwood KDC-BT645U Service Manual page 5

MICROCOMPUTER'S TERMINAL DESCRIPTION
● SYSTEM μ-COM : IC1 on X34- (ELECTRIC UNIT)
Pin No. Pin Name I/O
1~3 NC -
4 REMO I
5 NC -
6 BYTE -
7 CNVSS -
8 XCIN -
9 XCOUT -
10 RESET -
11 XOUT -
12 VSS -
13 XIN -
14 VCC1 -
15 NC -
16 LX REQ S I
17 RDS CLK I
18 PANEL DET I
19~22 NC -
23 RDS QUAL I
24 F SYNC -
25 RDS DATA I
26 BEEP O
27 TUN SCL I/O ATOMIC I2C clock output
28 TUN SDA I/O ATOMIC I2C data input/output
29 VFD SYS DATA O
30 VFD PAN DATA I
31 VFD CL O
32 VFD BLK O
33 BT SYS DATA O
34 BT BT DATA I
35 NC -
36 ROTARY CW I
37 ROTARY CCW I
38 PON PANEL I/O Panel 5V control
39 EPM I
39 ROMCOR DET I
40~43 NC -
44 VFD CE O
45 S SYS DATA O
46 S SOC DATA I
Application
Not used
Remote control input
Not used
Setting of memory extension bus
32.768kHz
32.768kHz
16.0MHz
16.0MHz
Not used
Communication request from slave unit
RDS decoder clock input
Panel communication detection
Not used
RDS decoder qualifi cation input
Not used
RDS decoder data input
Beep output
VFD data output
VFD data input
VFD clock output
VFD driver reset output
Data output to Bluetooth
Data input from Bluetooth
Not used
VOL encoder input
VOL encoder input
Flash ROM EPM input
E2PROM writing request
Not used
VFD control request
Serial output to Bolero
Serial input from Bolero
KDC-BT40U/BT645U
KDC-U546BT
Truth Value
Processing / Operation / Description
Table
Output L fi xed
Detects pulse width
Output L fi xed
Connects to VSS
Connects to VSS
H: Rewritable (Only when fl ash ROM is used)
L: Reset
Output L fi xed
H: Panel detached, L: Panel attached
Output L fi xed
Output L fi xed
2kHz / 1kHz
Communication begins after 500ms after VFD_BLK
becomes Hi.
125kHz
H: Reset canceled, L: Reset, Momentary power-down
or panel detached or 11 minutes after ACC OFF: L
Output L fi xed
Detects pulse width
Detects pulse width
ON: L, Momentary power-down or panel detached or
11 minutes after ACC OFF: Hi-Z
L: Rewritable (Only when fl ash ROM is used)
Connects to VSS
H: Writing
Output L fi xed
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