Microcomputer's Terminal Description - Kenwood KRC-709 Service Manual

KRC-709,779R/RY,889

MICROCOMPUTER'S TERMINAL DESCRIPTION

UPD703033GC050 (IC1: X14)
SYSTEM MICROCOMPUTER
Pin Name
1 AM+B
2 FM+B
3 AFS
4 PLL-DATA
5 PLL-CLK
6 Evdd
7 GND
8 N.C
9 BEEP
10 REMO
11 P-ON
12 P-STBY
13 IC2-SDA
14 IC2-SCK
15 P-MUTE
16 PRE-MUTE
DIMMER CON
17
18 TEST
19 P-CON
20 ANT-CON
21 MUTE
22 N.C
23 ACC-DET
24 DIMMER
25 SW-5V
26 CH-MUTE
27 CH-CON
28 CH-REQH
29 CH-RST
30 EXT-AMP-CONT
31 RESET
32 XT1
33 XT2
34 REGC
35 X2
4
I/O Purpose
O AM power supply terminal.
O FM power supply terminal.
O Constant switching when noise is detected.
I/O DATA input/output terminal from/to F/E.
I/O CLOCK input/output terminal from/to F/E.
- Positive power supply terminal.
- Grounding terminal.
O No connection.
O Beep output terminal.
I Remote control input terminal.
O SW 14 V control terminal.
O Power IC STBY terminal control.
I/O IC2 DATA line.
O IC2 CLOCK line.
O Power IC muting terminal.
O Pre-Out muting terminal.
O Dimmer control.
- Test pin.
O Power control terminal.
O Antenna control terminal.
O Muting terminal.
O No connection.
I Acc detection terminal.
I Small detection terminal.
O 5 V power supply terminal.
I Muting request from CH.
O CH control output.
O Request output to CH.
O Reset output to CH.
O External amplifier control terminal (In 200 ms).
I Reset input terminal
I Sub-clock connection terminal.
- Sub-clock connection terminal.
Output terminal for the capacitor in the
-
regulator in u-COM.
- Main clock connection terminal.
Operation Description
During AM operation: H.
During FM operation: H.
Last FM with RDS model: H
During FM seek or AM search: L.
During reception: H.
Power ON: H. Power OFF: L.
Power IC OFF: L. Power IC ON: H.
During reset: Input.
Power OFF: L. All OFF: L.
During TEL muting: L.
During momentary power down: L.
DIMMER: Pulse control.
DIMMER OFF: H.
Power ON: H. Power OFF: L.
TUNER, TI ON: H
ON: Open. OFF: L.
The time constant is 0.48 ms with all
models.
Acc detected: L. Acc not detected: H.
ON: L. OFF: H.
ON: L. OFF: H.
ON: H. OFF: L.
ON: H. OFF: L.
Requested: L.
Normal: L. When the system is
reset,turns H then L in 400 ms after
recovery from reset.
L 40 ms: Bass boost OFF.
L 70 ms: Bass boost LOW.
L 100 ms: Bass boost HIGH.
Normal: H. Reset: L.
The clock count is active even when
Power is OFF.
Power ON: Oscillated.
Power OFF or momentary power
down: Oscillation stopped.