Port Description Of Microcomputer - Kenwood RXD-M55-H Service Manual

5-2 Port Description of Microcomputer

Pin No. Pin Name
1 VREF-
2 PH
3 TN TYPE
4 S LEVEL
5,6 KEY1,KEY2
7 A LEVEL
8 TH
9 CD PROTECT
10 VREF+
11 VDD
12 OSC2
13 OSC1
14 VSS
15 XI
16 XO
17 MMOD
18 SDI
19 SDO
20 SCLK
21 MLD
22 SUBQ
23 SQCK
24 CL SW
25 RESET
26 CE
27 OP SW
28 CD POWER
29 XRST
30 SLT SW
31 REM CONTROL
32 NO USE
33 RDSCLK
34 CE2
35 CD BLKCK
36 MDATA
37 STAT
38 MCLK
39 CLOSE
40 OPEN
41 HP I
42 FLASH UC 1
43 FLASH UC 2
44 EVOL CE
45 EVOL.CLK
46 EVOL.DATA
47 POWER RLY
48,49 N.C.
50 FLASH WRITE
51 N.C.
52 PLL CLK
53 PLL DO/ST
54 PLL DAT
55 PLL CE
RXD-M55-H/M55-N/M55-S/M55E-H/M55E-N/M55E-S
CIRCUIT DESCRIPTION
I/O
- Power supply (-) for A/D converter.
I Deck reel sensor input.
I Discrimination of tuner destination.
I RDS signal level input. (E/T version only)
I A/D key (1, 2) input.
I Unused.
I Unused.
I Detection pin of CD protection.
- A/D reference voltage input of the A/D converter.
I Pin for power supply (+5V).
O Main clock output (8.388MHz).
I Main clock input (8.388MHz).
- Connected to be ground.
I Timer clock input (32.768kHz).
O Timer clock output (32.768kHz).
- Connected to be ground.
O Data output to FL driver.
I Data input from FL driver.
O Clock output to FL driver.
O CD DSP command load signal output.
I CD sub code input.
O CD sub code clock output.
I Input pin of close switch for CD tray.
I Reset signal input for microcomputer.
I Back up detection input.
I Input pin of open switch for CD tray.
O ON/OFF control pin for CD DSP power.
O CD DSP reset output.
I CD start limit switch input. "L" : Start Limit Position
I Remote control signal input.
- Unused.
I RDS clock input. (E/T version only)
I Detection pin of voltage drop.
I Sub code block clock input.
O CD DSP command data output.
I CD DSP status signal input.
O CD DSP command clock signal output.
O Control pin of CD tray motor.
O Control pin of CD tray motor.
I Detection pin for headphones jack.
I Power supply for flash ROM.
I Power supply for flash ROM.
O Chip enable output of electronic volume (X29, IC601).
O Clock output of electronic volume (X29, IC601).
O Data output of electronic volume (X29, IC601).
O Power relay control.
- Unused.
I Unused.
- Unused.
O PLL IC clock output.
I PLL IC data input.
O PLL IC data output.
O PLL IC chip enable output.
Pin Description
Active
H L
Load
Closed
Reset
AC On AC Off
Opened
ON OFF
Reset
Detected
ON
9