Microcomputer's Terminal Description - Kenwood KRC-21SA Service Manual

KRC-21SA/SG/SYA/SYG
KRC-266/S
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MICROCOMPUTER'S TERMINAL DESCRIPTION

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SYSTEM MICROCOMPUTER LC72366-9592 (IC1 : X14-685x-xx)
Pin No. Pin name
1 XIN
2 GND
3 L DATA L
4 L DATA S
5 L CLK
6 L CE
7 SDA
8 PLL DATA
9 PLL CLK
10 SD
11 DATA C
12 DATA H
13 CH CLK
14 -
15 MOTOR
16 SCL
17-24 -
25 AM+B
26 FM+B
TE
L 13942296513
27 PACK IN
28 FF/REW
29 GND
30 GND
31 VDD
32 REQ C
33 MUTE
34 CH CON
35 REQ H
36 SVR
37 AMP STBY
38 AMP MUTE
39 P CON
40 ANT CON
41 SW5V
42 ILL
43 -
44 BEEP
45-47 -
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48 ROLL OFF
NOISE
49
CANCELLER .
4
I/O Description
I Main clock resonator connection terminal
- TEST terminal 2
I Data input from the LCD driver IC
O Data output to the LCD driver IC
O Clock output to the LCD driver IC
O CE output to the LCD driver IC
I/O Data input/output with the E-VOL. IC
I/O Data input/output with the F/E
O Clock output to the F/E
I SD input from the F/E
I Data input from changers
O Data output to changers
I/O Clock input/output with changers
O -
O Cassette motor on/off output
O Clock output to the E-VOL. IC
O -
O AM+B ON/OFF output
O FM+B ON/OFF output
I Cassette tape Pack-in detection input
I FF/REW detection input
I -
I -
- Positive power supply connection terminal
I Request input from changers
O Audio mute on/off output
O Changer control
O Request output to changers
O Power IC reset terminal
O Power IC standby control output
O Power IC mute control
O Power control
O Antenna control
O SW 5V control
O Illumination AVR ON/OFF control terminal
O -
O BEEP sound output
O -
I Roll off input
x ao u163
y
I Noise canceller input
i
2 9
8
Connected to GND lines.
Hi : Station detected
N.C. (Not used)
Hi : Motor ON
N.C. (Not used)
Hi : during AM reception
Hi : during FM reception
Q Q
3 6 7 1 3 1 5
Lo : Pack-in
Lo : FF/REW, Hi : PLAY
Connected to GND lines.
Connected to GND lines.
Connected to B.U. 5V lines.
Lo : Request
Hi : Mute ON
Lo : Standby, Hi : ON
Lo : Request
When the momentary power down, after ACC
ON/OFF is detected and after POWER OFF,
the output becomes Hi temporarily.
Hi : POWER ON mode
Lo : Mute
Hi : POWER ON mode
Hi : during FM/AM reception
Lo : POWER ON mode
Hi : POWER ON mode
N.C. (Not used)
N.C. (Not used)
Pull down to GND lines. (Not used)
co
Pull down to GND lines. (Not used)
.
9 4 2 8
Processing Operation
0 5 8 2 9 9 4 2 8
m
9 9
9 9