LC78631 データシートの表示（PDF） - SANYO -> Panasonic

部品番号

コンポーネント説明

メーカー

LC78631

Compact Disk Player DSP

SANYO -> Panasonic 

LC78631E

4. Command input

An external controller can execute LC78631E instructions by setting RWC high and inputting commands to COIN in

synchronization with the CQCK clock. Commands are executed on the fall of the RWC signal.

• Single-byte commands

• Two-byte commands

• Command noise reduction

Code

$EF

$EE

Command

COMMAND INPUT NOISE REDUCTION MODE

CLEAR THE ABOVE MODE

RES = low

q

This command can reduce the noise on the CQCK clock signal. While this is effective for noise pulses under

500 ns, the use of this function requires that the CQCK timings tWL, tWH, and tSU (see Figure 1 and 2) be set to

1 µs or longer.

5. CLV servo circuit

• CLV servo circuit; Pin 13: CLV+, pin 14: CLV–, pin 15: 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+ signal causes the disc to accelerate in the forward direction, and CLV– causes the disc to decelerate. The

microcontroller can select one of four modes: accelerate, decelerate, CLV, and stop. The table below lists the states

of the CLV+ and CLV– pins in each of these modes.

Mode

Accelerate

Decelerate

CLV

Stop

CLV+

High

Low

Pulse output

Low

CLV–

Low

High

Pulse output

Low

Note: The CLV servo control commands only set the TOFF pin low during CLV mode. That pin will be at the high

level at all other times. Thus controlling the TOFF pin with microcontroller commands is only possible in

CLV mode.

No. 5342-11/34

Share Link: