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The Servo Command Functions
Various commands can be executed by setting RWC to high and by inputting the command from COIN synchronized
with the CQCK clock. The commands are executed beginning with the falling edge of RWC.
Focus start
Track jump
Mute control
Disk motor control
Other control
Track check
Digital attenuator
General port I/O settings
• Single-byte commands
• Two-byte commands (RWC 2 set: for the track count)
• Two-byte commands (RWC 1 set: digital attenuation and setting the general I/O port)
• Eliminating command noise
Code
$EF
Command input noise reduction mode
$EE
Resets the command input noise reduction mode
This command makes it possible to reduce the noise that is mixed into the CQCK clock. This is effective for noise of
less than 500 ns; however, the CQCK timing must be set to have 1 µs or more for t
LC78626KE
Pin 62: RWC, Pin 63: COIN, Pin 64: CQCK
Single-byte commands
Two-byte command (two sets of RWC)
Two-byte commands (once set of RWC)
Command ($F0, $F8)
Data
COMMAND
At least 1 µs
Data ($08 to $FE), command ($FF)
Commands ($81 to $87, $DB, $DC)
RES = low
, t
, and t
.
WL
WH
SU
No. 5995-12/34
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