MSM6688_07 datasheet(8/167 Pages) OKI

8 / 167 page

FEDL6688-6688L-04

OKI Semiconductor

MSM6688/6688L

8/167

Symbol

Type

Description

DI/O

I/O

(Data I/O) Used to connect the DIN and DOUT pins of DRAM and serial

inputs the data read from the serial registers.

DROM

(Data ROM) Used to connect the DOUT pin of each external serial voice

ROM.

CS1

CS2

CS3

CS4

(Chip Select) Used to connect the CS pin of serial register and the CS (CS1,

CS2, CS3) pins of each serial voice ROM.

RSEL1

RSEL2

(Register Select) These are used to select the number of external serial

registers.

MCUM

This pin is used to select either the stand-alone mode or the microcontroller

interface mode.

Low level:

Stand-alone mode

High level:

Microcontroller interface mode

RESET

A high input level at this pin causes the MSM6688 to be initialized and to go

into the power down state.

PDWN

(Power Down) When a low level is input to this pin, the MSM6688 goes to the

power down state. Unlike the RESET pin, this pin does not force to reset the

MSM6688. When an low level is applied to this PDWN pin during recording

operation, the MSM6688 is halted, and will be maintained in the power down

state while PDWN is low. After this pin is restored to a high level,

postprocessing for recording will be performed.

Used to connect an oscillator. When an external clock is used, input the clock

through this pin. At the power down state, this pin must be set to the ground

level.

Used to connect an oscillator. When an external clock is used, this pin must

be left open.

TEST

Used to test the MSM6688. Input a low level to the TEST pin and a high level

to the TEST pin.

RSEL2

RSEL1

Number of serial registers

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