LC78624E Datasheet, PDF (10/27 Pages) Sanyo Semicon Device – Compact Disc Player DSP

LC78624E
• Two-byte commands (RWC set once: Sets up the general-purpose I/O ports)
A09904
• Command noise rejection
Code
$EF
$EE
Command
COMMAND INPUT NOISE REDUCTION MODE
RESET THE MODE ABOVE
RES = low
q
This command reduces the noise on the CQCK clock signal. While this is effective for noise pulses shorter than
500 ns, the CQCK timings t_WL, t_WH, and t_SU, must be set for at least 1 µs.
6. CLV Servo Circuit; Pin 12: CLV⁺, pin 13: CLV^–, pin 14: V/P
Code
$04
$05
$06
$07
Command
DISC MOTOR START (accelerate)
DISC MOTOR CLV (CLV)
DISC MOTOR BRAKE (decelerate)
DISC MOTOR STOP (stop)
RES = low
q
The CLV⁺ pin provides the signal that accelerates the disk in the forward direction and the CLV^– pin provides the
signal that decelerates the disk. Commands from the microcontroller select one of four modes; accelerate, decelerate,
CLV and stop. The table below lists the CLV⁺ and CLV^– outputs in each of these modes.
Mode
Accelerate
Decelerate
CLV
Stop
CLV⁺
High
Low
Pulse output
Low
CLV^–
Low
High
Pulse output
Low
A09905
Note: CLV servo control commands can set the TOFF pin low only in CLV mode. That pin will be at the high level
at all other times. Control of the TOFF pin by microcontroller command is only valid in CLV mode.
No. 5811-10/27