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4-2 Port Description of Microprocessor
Port No.
Port Name
36
SLT SW
37
XRST
38
OP SW
39,40
NC
41
VPP
42
MDATA
43
STAT
44
MCLK
45
MLD
46
SUBQ
47
SQCK
48
EEP SDA
49
EEP SCL
50
HP IN
51
OPEN
52
CLOSE
53
MD CE
54
MD RST
55
INI MD SW
56
BACK CHK
57
BACK ON
58
MD IN SW
59
NC
60
PLAY SW
61
CrO2 SW
62
HALF SW
63
REC F SW
64
CPM
65
REC R SW
66
SOL
67
LMUTE
68
A/B-1
69
A/B-2
70
Bø/¿
71
NOR
72
BIAS
73
R/P
74
BEAT C
75
NC
76
EVCLK
77
EVDATA
78~80
NC
81
LED STBY GRN
82
LED STBY RED
83,84
NC
85
CD POWER
86
SP RLY
87
AMUTE
88
POWER
89
PROTECTION
90
RDS DATA
91
TU MUTE
92
EMPHASIS
93
ST
94
SD
95
GND
96
PLL DATA
97
PLL CLK
98
PLL DO
99
PLL CE
100
DAVDD
Used for RXD-M33MD only.
CIRCUIT DESCRIPTION
I/O
Description
I
CD start limit switch input.
O
CD DSP reset output.
I
Input port of open switch for CD tray.
-
Unused.
I
Microcomputer power supply (+5v).
O
CD DSP command data output.
I
CD DSP status signal input.
O
CD DSP command clock signal output.
O
CD DSP command load signal output.
I
CD sub code input.
O
Clock output for CD sub code.
-
Unused.
-
Unused.
I
Detection port for headphones jack.
O
Control port of CD tray motor.
O
Control port of CD tray motor.
I
Detection port for MD back up.
I
Reset output from MD mechanism.
-
Unused.
-
Unused.
-
Unused.
I
Load switch input for MD disc.
-
Unused.
I
Detection switch input of head position for deck.
I
Detection switch input of CrO2 tape for deck.
I
Cassette half switch input.
I
Deck forward recording switch input.
O
Control port of capstan motor for deck.
I
Deck reverse recording switch input.
O
Control port of solenoid for deck.
O
Deck lien mute control.
O
Deck recording mute & head select control 1.
O
Deck recording mute & head select control 2.
O
Control port of recording equalizer for deck.
O
Switching port of bias (NOR/CrO2) for deck.
O
Control port of bias on/off for deck.
O
Deck recording & playback changeover.
O
On/off control port of beat cancel for deck.
-
Unused.
O
Sound controller clock output.
O
Sound controller data output.
-
Unused.
O
Standby led (green) control port.
O
Standby led (red) control port.
-
Unused.
O
CD DSP power on/off changeover control.
O
On/off control port for speaker relay.
O
Audio mute output.
O
Power relay control.
I
Detection port for power supply protection.
I
RDS data input. (RDS version only)
O
Tuner mute control.
-
Unused.
I
Stereo detector input.
I
SD detector input.
-
Connected to ground.
O
PLL IC data output.
O
PLL IC clock output.
I
PLL IC data input.
O
PLL IC chip enable output.
I
D/A converter positive voltage.
RXD-M33/M33MD
ACTIVE
H
L
RESET
OFF
ON
OFF
ON
ON
ON
OFF
RECORDING PLAYBACK
ON
OFF
OFF
ON
OFF
ON
ON
OFF
9
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