Microcomputer Terminal Description - Kenwood KRC-708 Service Manual

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MICROCOMPUTER TERMINAL DESCRIPTION

UPD784217GC103(105) (IC1: X14-618X-XX)
System MicroComputer
Pin Pin Name
1 P120/RTP0
2 P121/RTP1
3 P122/RTP2
4 P123/RTP3
5 P124/RTP4
6 P125/RTP5
7 P126/RTP6
8 P127/RTP7
9 Vdd
10 X2
11 X1
12 Vss
13 XT2
14 XT1
15 RESET
16 P00/INTP0
17 P01/INTP1
18 P02/INTP2/NMI
19 P03/INTP3
20 P04/INTP4
21 P05/INTP5
22 P06/INTP6
23 AVdd
TE
L 13942296513
24 AVref0
25 P10/ANI0
26 P11/ANI1
27 P12/ANI2
28 P13/ANI3
29 P14/ANI4
30 P15/ANI5
31 P16/ANI6
32 P17/ANI7
33 AVss
34 P130/ANO0
35 P131/ANO1
36 AVref1
37 P70/RxD2/SI2
38 P71/TxD2/SO2
39 P72/ASCK2/SCK2 CH_CLK
40 P20/RxD1/SI1
41 P21/TxD1/SO1
42 P22/ASCK1/SCK1 L_CLK
43 P23/PCL
44 P24/BUZ
www
45 P25/SI0
46 P26/SO0
47 P27/SCK0
48 P80/A0
.
49 P81/A1
50 P82/A2
51 P83/A3
Signal Name I/O
CHCON O
CH_MUTE I
REQH O
DIMMER I
MOTER O
NC O
NC O
NC O
Vdd -
X2 -
X1 -
Vss -
XT2 -
XT1 -
RESET I
CH_RST O
R_CLK I
REQC I
KEY REQ I
SUB_MOTOR3 O
SUB_MOTOR2 O
SUB_MOTOR1 O
Avdd -
AVref0 -
PHONE I
SRM_SW1 I
NOISE I
SMETER I
F_REEL I
R_REEL I
N.C. I
N.C. I
AVss -
EXT_AMP O
IF_MODE I
AVref1 -
DATAC I
DATAH O
I/O Clock line with changer.
L_DATAL I
L_DATAS O
O
DIMMER O
BEEP O
PLL_CE O
PLL_DATA I/O Data input/output with PLL.
x ao u163
y
PLL_CLK O
ILL_ON O
i
PANEL_5V O
L_CE O
LOCK_SW I
KRC-708/888/X858/PS988R
2 9
8
Purpose
Changer control terminal.
Muting input to changer.
Handshake request to changer.
Small detection.
Cassette mechanism main motor
output.
Positive power supply.
Main clock connection.
Main clock connection.
GND terminal.
Sub-clock connection.
Sub-clock connection.
Reset input.
Reset output to changer.
RDS clock input.
Handshake request from changer.
Sub-motor output. 3
Sub-motor output. 2
Sub-motor output. 1
A/D analog power supply.
Q Q
3 6 7 1 3 1 5
A/D reference voltage input.
Phone detection.
SRM position detection.
FM noise detection.
FM S meter detection.
Cassette mechanism reel pulse input
(FWD).
Cassette mechanism reel pulse input
(REV).
A/D GND terminal.
External amp control.
IF status detection for K2I.
D/A reference voltage input.
Data line from changer.
Data line to changer.
Data line from LCD driver.
Data line to LCD driver.
Clock line to LCD driver.
Dimmer control output.
Beep output.
CE to PLL.
co
Clock output to PLL.
ILL ON
.
5V power supply control for LCD
driver.
CE terminal to LCD driver
Panel lock SW detection terminal.
9 4 2 8
Operation Description
ON:Hi, OFF:Lo
ON:Hi, OFF:Lo
DIMMER ON:Lo, OFF:Hi
Active; Hi.
Active: Lo.
Active: Hi.
0 5 8 2 9 9 4 2 8
1 V or less: TEL MUTE
/2.5 V or more: NAVI MUTE.
Open: Hi.
L 40mS:Bass boost OFF
L 70mS:Bass boost LOW
L 100mS:Bass boost Hi
Hi = WIDE, Lo = NARROW
Active: Hi.
m
ILL ON : Hi
Active: Lo.
Lock SW ON : Lo
9 9
9 9
3