7
DM-VH7
CIRCUIT DESCRIPTION
Pin No.
Name
I/O
Description
91
MNT1
I
ACRIC/ATRAC en/decoder IC shock (track jump) detection
92
XINT
I
ATRAC thrust
93~95
-
-
Not used
96
TX
O
ACRIC/ATRAC en/decoder IC TX (Recording data output enable)
97
RECP
O
ACRIC/ATRAC en/decoder IC RECP (Laser power changeover)
98
XRST
O
ACRIC/ATRAC en/decoder IC reset
99
LDON
O
Laser ON
100
RMS
O
Pickup frequency changeover
Pin No.
Name
I/O
Description
1
DO
O Communication data output
2
DI
I
Communication data input
3
CLK
I
Communication clock input
4
RESET
I
Ucom reset
5
NMI
I
(Non mask able thrust)
6
Vcc
-
Ucom power supply
7
STBY
I
Ucom standby
8
Vss
-
Ucom power supply)GND)
9
XTAL
-
ucom OSC(16MHz)
10
EXTAL
I
ucom OSC(16MHz)
11
MD1
I
Ucom mode MD0/MD1
12
MD0
I
Ucom mode inner ROM
extension mode :
13
AVss
-
Ucom A/D power supply(GND)
14~21
-
-
Not used
22
AVcc
-
Ucom A/D power supply
23~30
-
-
Not used
31
Vcc
-
Ucom power supply
32~39
-
-
Not used
40
Vss
-
Ucom power supply (GND)
41~47
-
-
Not used
48
A0
O LCD drive control
49~56
D0~D7 I/O LCD drive control
57
-
-
Not used
58
LAT
I
Communication latch /thrust
59
-
I
Not used
60
RD
O LCD drive control
61
WR
O LCD drive control
62
CS1
O LCD drive control
63
-
-
Not used
64
-
-
Not used(Pull up)
4. LCD display microprocessor
HD6433297A17F(X25:IC12)
4-1 Description
3-3 Port control
E
BITRATE (46 pin): UART communication speed
changeover
E
HEADPOS(47pin): Head position detection
Input voltage
Bit rate
Vref
×
1.0
9600bps
~
Vref
×
0.8
14400bps
~
Vref
×
0.6
28800bps
~
Vref
×
0.4
33600bps
~
Vref
×
0.2
38400bps
~
Vref
×
0.0
19200bps
Input voltage
Head position
Vref
×
1.0
OFF
~
Vref
×
0.62
PLAY position
~
Vref
IDSW(48 pin): DISC type detection
~
Vref
×
0.32
HIGH REFLECTION DISC
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