CIRCUIT DESCRIPTION
Input Voltage
KEY1
KEY2
KEY3
(V)
Pin97
Pin95
Pin94
0.00
0.26
POWER
EX. BASS
REV. MODE
0.27
0.81
DISPLAY/DEMO
KEY OFF
REC
0.82
1.37
TUNING MODE
CD PLAY/ PAUSE
TAPE EQ.
1.38
1.94
MENU
BAND
OPEN/CLOSE
1.95
2.51
SOUND
TAPE B
DISC SKIP
2.52
3.07
BACK
TAPE A
DISC 3
3.08
3.62
SELECT
AUX
DISC 2
3.63
4.16
ENTER
STOP
DISC 1
4.17
4.73
4.73
5.00
KEY OFF
KEY OFF
KEY OFF
4-2 Key Matrix
Pin No.
Pin Name
I/O
Description
ACTIVE
H
L
1
SLEVEL
I
RDS signal level input.
2
CE2
I
Backup detection input 2.
AC ON
AC OFF
3
SD
I
SD detection input.
4
ST
I
Stereo detection input.
5
PLL CE
O
PLL IC & E. volume chip enable.
6
RDS DATA
I
RDS data input.
7
PLL CLK
O
PLL IC & E. volume clock output.
8
BYTE
-
GND.
9
CNVSS
-
GND.
10
XCIN
I
Timer clock input(32.768kHz).
11
XCOUT
O
Timer clock output(32.768kHz).
12
RST
I
Reset signal input.
NORMAL
RESET
13
X OUT
O
Main clock output(10MHz).
14
VSS
-
GND.
15
X IN
I
Main clock input(10MHz).
16
VCC(BU)
-
u-com power 5.0V).
17
NMI
-
Connected to VCC.
18
REM
I
Signal input of remote control.
19
RDS CLK
I
RDS clock input.
20
BLKCK
I
Sub code synchronous signal input. L
H Interrupt
21
CE
I
Back up detection input.
AC ON
AC OFF
22
BEEP SOUND
O
Beep sound output.
23
PLL DO
I
PLL IC data input.
24
CS RELAY
O
Relay control port for center and surround speakers.
ON
OFF
25
D XRESET
O
DSP reset port.
RESET
26
DXLAT
O
DSP latch output.
27
AMUTE
O
Control port of audio muting.
28
MCLK
O
CD DSP command clock signal output.
29
STAT
I
CD DSP status signal input.
30
MDATA
O
CD DSP command data output.
31
FL DATA
O
Data output to VFD dot driver.
32
HPDET
I
Detection port of headphones.
NORMAL
H/P IN
33
FL CLK
O
Clock output to VFD dot driver.
34
FL CE
O
Chip enable output toVFD dot driver.
35
D DATA
O
DSP data output.
36
D READY
I
DSP ready signal input.
37
D.SCK
O
DSP clock output port.
38
SOLB
O
B deck solenoid control.
ON
OFF
39
CPM
O
Capstan control port for deck.
ON
OFF
40
SOLA
O
A deck solenoid control.
ON
OFF
4-3 Pin Description of Microprocessor
RXD-803/803E/853/853E/A83
8
