No. 6329-13/40

LC78628E

MSB

LSB

Data

Command ($81 to $87, $DB, $DC, $D8)

MSB

LSB

RWC

CQCK

COIN

A12807

• Two-byte commands (RWC set once)

Code

Command

RES = low

$FE

Command input noise reduction mode

$EE

Reset command input noise reduction mode

q

q

• Command noise reduction

Code

Command

RES = low

$04

Disc motor start (accelerate)

$05

Disc motor CLV (CLV)

$06

Disc motor brake (decelerate)

$07

Disc motor stop (stop)

q

q

PCCL input level

Command transfer during track check, track jump, and internal motor braking operations

L

Incorrect operation occurs if a command is transferred (if a high level is applied to RWC).

H

Transfer of only the port related ($DBXX and $DCXX) and HDCD register setting ($D8XX) commands is allowed.

Mode

Accelerate

H

L

Decelerate

L

H

CLV

Pulse output

Pulse output

Stop

L

L

• PCCL

The PCCL control pin is provided to allow the use of certain commands for which command transfer is disabled during

track check, track jump, and internal motor braking operations.

A12808

14

13

CLV–

CLV+

+

–

+

–

Disc motor

M

Note: The CLV servo control commands set the TOFF pin low during CLV mode, and high at all other times. The TOFF pin can only be controlled by

commands during CLV mode.