Microcomputer's Terminal Description - Kenwood KRC-594 Service Manual

MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM MICROCOMPUTER MN101C49HNA (IC1: X14-)
Pin No. Name Module
1 VREF- Power supply
2 F REEL TAPE
3 R REEL TAPE
4 S-METER TUNER
5 IFC-OUT TUNER
6 NOISE TUNER
7 PHONE EXTRA
7 PHONE EXTRA
8 DCDET RESERVE Power supply
9 GND Power supply
10 VREF+ Power supply
11 VDD Power supply
12 MAIN OSC1
13 MAIN OSC2
14 VSS Power supply
15 SUB OSC1
16 SUB OSC2
17 GND Power supply
18 LX-DATAM
19 LX-DATAS
20 LX-CLK
21 FLASH READ
22 FLASH WRITE
23 FLASH CLK
24 BEEP AUDIO
25 PANEL-DET to PANEL
26 REMO to PANEL
27 R-CLK TUNER
27 NC
28 LX-REQS
29 B.U-DET Power supply
30 EJECT to PANEL
31 KEY-REQ to PANEL
32 VDD Power supply
33 RESET
34 EQ MUTE TAPE
35 DOLBY TAPE
36 MUSIC TAPE
37 NC
38 NC
39 NC
40 NC
41 VDD Power supply
42 L DATAS to PANEL O TXD for LCD
43 L DATAL to PANEL
44 L CLK to PANEL O Clock for LCD
45 PLL DATA TUNER
46 NC
I/O Description
GND for A/D
I Reel pulse FWD
I Reel pulse REW
I K3I tuner S-meter
I IF count
I FM noise detection terminal
I PHONE detection terminal
I When Not used, output L fixed
I Not used DE DET pull down
GND
VCC for A/D
Microcomputer's main Vcc
Main oscillation input
Main oscillation input
Microcomputer's main GND
32.768kHz oscillation input
32.768kHz oscillation input
GND
LX O Data output to CH
LX I Data input from CH
LX O Clock input and output with CH
O
O
O
O Beep for built in amplifier
I Panel existence detection terminal
I Remote control input
I Clock for RDS decoder
O With no RDS output L fixed
LX I Request input from CH
I Momentary power down detection
I Tape eject
I Communication request from LCD driver L :KEY input
I
I Reset
O Equalizer mute
O B NR ON/OFF
I Tape between music detection
O
O
O
O
I
I RXD for LCD
I/O Tuner I2C SDA
O
KRC-594/V/Y/YV
Processing Operation
Cassette mecha reel pulse output FWD Vth=2.5V
Cassette mecha reel pulse output REW Vth=2.5V
0V or 5V
Tel mete :1V or less, NAVI MUTE:2.5V or less,
Only J type 1V or less,more than 2.5V NAVI
DC offset detection terminal of P-IC
8.38MHz
External ROM
Last maintain
Detached the panel :L, Attached the panel :H
With no destination:out put L fixing
Request detection :L
BU detection :L
L :KEY input
VDD
During tape play :L
During tape FF/REW :H
Mode except tape :H
B NR ON:H,
Mode except tape :keep the value
music signal detection:L, with no music signal:H
VDD
With no BU :H
B NR OFF:L
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