Microcomputer's Terminal Description - Kenwood KRC-20SA Service Manual

MICROCOMPUTER'S TERMINAL DESCRIPTION

Terminal Description (IC1 : X14-6852-71)
Pin No. Pin name I/O
1 XIN I
2 GND -
3 L DATA L I
4 L DATA S O
5 L CLK O
6 L CE O
7 SDA I/O
8 PLL DATA I/O
9 PLL CLK O
10 SD I
11 DATA C I
12 DATA H O
13 CH CLK I/O
14 - O
15 MOTOR O
16 SCL O
17-24 - O
25 AM+B O
26 FM+B O
27 PACK IN I
28 FF/REW I
29 GND I
30 GND I
31 VDD -
32 REQ C I
33 MUTE O
34 CH CON O
35 REQ H O
36 SVR O
37 AMP STBY O
38 AMP MUTE O
39 P CON O
40 ANT CON O
41 SW5V O
42 ILL O
43 - O
44 BEEP O
45-47 - O
48 ROLL OFF I
NOISE
49 I
CANCELLER
50 SEL1 I
51 SEL2 I
52 SEL3 O
Description
Main clock resonator connection terminal
TEST terminal 2
Data input from the LCD driver IC
Data output to the LCD driver IC
Clock output to the LCD driver IC
CE output to the LCD driver IC
Data input/output with the E-VOL. IC
Data input/output with the F/E
Clock output to the F/E
SD input from the F/E
Data input from changers
Data output to changers
Clock input/output with changers
-
Cassette motor on/off output
Clock output to the E-VOL. IC
-
AM+B ON/OFF output
FM+B ON/OFF output
Cassette tape Pack-in detection input
FF/REW detection input
-
-
Positive power supply connection terminal
Request input from changers
Audio mute on/off output
Changer control
Request output to changers
Power IC reset terminal
Power IC standby control output
Power IC mute control
Power control
Antenna control
SW 5V control
Illumination AVR ON/OFF control terminal
-
BEEP sound output
-
Roll off input
Noise canceller input
Destination input 1
Destination input 2
Destination input 3
KRC-20SA/G
Processing Operation
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
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)
Pull down to GND lines. (Not used)
Hi : KRC-20S
Hi : KRC-20S
N.C. (Not used)
5