KRC-709,779R/RY,889
4
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin
Name
I/O
Purpose
Operation Description
1
AM+B
O
AM power supply terminal.
During AM operation: H.
2
FM+B
O
FM power supply terminal.
During FM operation: H.
Last FM with RDS model: H
3
AFS
O
Constant switching when noise is detected.
During FM seek or AM search: L.
During reception: H.
4
PLL-DATA
I/O DATA input/output terminal from/to F/E.
5
PLL-CLK
I/O CLOCK input/output terminal from/to F/E.
6
Evdd
-
Positive power supply terminal.
7
GND
-
Grounding terminal.
8
N.C
O
No connection.
9
BEEP
O
Beep output terminal.
10
REMO
I
Remote control input terminal.
11
P-ON
O
SW 14 V control terminal.
Power ON: H. Power OFF: L.
12
P-STBY
O
Power IC STBY terminal control.
Power IC OFF: L. Power IC ON: H.
During reset: Input.
13
IC2-SDA
I/O IC2 DATA line.
14
IC2-SCK
O
IC2 CLOCK line.
15
P-MUTE
O
Power IC muting terminal.
Power OFF: L. All OFF: L.
During TEL muting: L.
16
PRE-MUTE
O
Pre-Out muting terminal.
During momentary power down: L.
17
DIMMER CON
O
Dimmer control.
DIMMER: Pulse control.
DIMMER OFF: H.
18
TEST
-
Test pin.
19
P-CON
O
Power control terminal.
Power ON: H. Power OFF: L.
20
ANT-CON
O
Antenna control terminal.
TUNER, TI ON: H
ON: Open. OFF: L.
21
MUTE
O
Muting terminal.
The time constant is 0.48 ms with all
models.
22
N.C
O
No connection.
23
ACC-DET
I
Acc detection terminal.
Acc detected: L. Acc not detected: H.
24
DIMMER
I
Small detection terminal.
ON: L. OFF: H.
25
SW-5V
O
5 V power supply terminal.
ON: L. OFF: H.
26
CH-MUTE
I
Muting request from CH.
ON: H. OFF: L.
27
CH-CON
O
CH control output.
ON: H. OFF: L.
28
CH-REQH
O
Request output to CH.
Requested: L.
Normal: L. When the system is
29
CH-RST
O
Reset output to CH.
reset,turns H then L in 400 ms after
recovery from reset.
L 40 ms: Bass boost OFF.
30
EXT-AMP-CONT
O
External amplifier control terminal (In 200 ms).
L 70 ms: Bass boost LOW.
L 100 ms: Bass boost HIGH.
31
RESET
I
Reset input terminal
Normal: H. Reset: L.
32
XT1
I
Sub-clock connection terminal.
The clock count is active even when
Power is OFF.
33
XT2
-
Sub-clock connection terminal.
34
REGC
-
Output terminal for the capacitor in the
regulator in u-COM.
Power ON: Oscillated.
35
X2
-
Main clock connection terminal.
Power OFF or momentary power
down: Oscillation stopped.
UPD703033GC050 (IC1: X14)
SYSTEM MICROCOMPUTER
