參數(shù)資料
型號(hào)： LC78631E
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 21/34頁(yè)
文件大?。?/td> 502K
代理商： LC78631E
27. Clock oscillator; Pin 53: XIN, pin 52: XOUT
The clock that is used as the time base is generated by connecting a
16.9344 or 33.8688 MHz oscillator element between these pins. The OSC
OFF command turns off both the VCO and crystal oscillators. Double- or
quad-speed playback can be specified by microprocessor command.
Use a 16.9344 MHz oscillator element if the application circuit implements a 2
×-speed playback system. The
system control microprocessor can then issue 2
×-speed or normal-speed playback commands.
Use a 33.8688 MHz oscillator element if the application circuit implements a 4
×-speed playback system. When
implementing a 4
×-speed playback system, use a 33.8688 MHz oscillator element and send a XTAL32M command
($CF) at system initialization. After initialization, use the 4
×, 2×, and normal-speed playback commands to set the
playback speed.
28. 16M and 4.2M pins; Pin 75: 16M, pin 76: 4.2M
If a 16.9344 MHz oscillator element is used, the 16M pin will output a 16.9344 MHz signal from a buffer circuit in
2
×-speed and normal-speed playback modes. If a 33.8688 MHz oscillator element is used, the 16M pin will output a
33.8688 MHz signal from a buffer circuit in 4
×-speed playback mode. The 4.2M pin functions as the
LA9230/LA9240 Series system clocks and always outputs a 4.2336 MHz signal. In oscillator off mode, both of these
pins are held either high or low.
29. Reset circuit: Pin 72: RES
This pin must be pulled low temporarily and then set high after power is first applied. This sets the muting to –
∞ dB
and the disc motor to stopped.
Setting the RES pin low directly sets the states enclosed in boxes.
No. 5342-28/34
LC78631E
Code
Command
RES = low
$8E
OSC ON
q
$8D
OSC OFF
$CE
XTAL 16M
q
$CF
XTAL 32M
$C2
NORMAL-SPEED PLAYBACK
q
$C1
DOUBLE-SPEED PLAYBACK
$C8
QUAD-SPEED PLAYBACK
CLV servo system
START
BRAKE
CLV
Muting control
0 dB
Subcode Q address conditions
Address free
CONT1, CONT2
High
Track jump mode
New
Track count mode
Old
Digital attenuator
DATA $00 to $EE
OSC
OFF
XTAL
32M
Playback speed
Double speed
Quad speed
Antishock mode
ON
General-purpose input ports
Input or output set independently
Digital filter normal speed
ON
OFF
All pins input
OFF
Normal speed
16M
ON
DATA $00
New
Old
Low
Address 1
–
∞
STOP
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