MSM6688_07 datasheet(52/167 Pages) OKI

52 / 167 page

FEDL6688-6688L-04

OKI Semiconductor

MSM6688/6688L

52/167

QFP

TQFP

Symbol

Type

Description

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 MSM6688/6688L 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 MSM6688/6688L. When an low level is applied

to this PDWN pin during recording operation, the MSM6688/6688L 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.

I/O

Bi-directional data bus to transfer commands and data to and from

an external microcontroller.

Write pulse input pin. Inputting a low pulse to this WR pin causes a

command or data to be input via D0-D3 pins.

Read pulse input pin. Inputting a low pulse to this RD pin causes

status bits or data to be output via D0-D3 pins.

Chip enable input pins. When the CE pin is set to a low level or the

CE pin is set to a high level, the write pulse (WR), read pulse (RD)

can be accepted.

When the CE pin is set to a high level or CE pin is set to a low level,

the write pulse (WR) and read pulse (RD) cannot be accepted so

that data cannot be transferred to and from via D0-D3 pins.

BUSY

Outputs a high level while a command is being executed. When this

pin is held high, do not apply any data to D0-D3 pins. The state of

this BUSY pin is the same as the contents of the BUSY bit of the

status register.

RPM

Outputs a high level during recording or playback operation. The

state of this RPM is the same as the contents of the RPM bit of the

status register.

VPM

Outputs a high level during the standby for voice after the start of

voice triggered recording and the record/playback is stopped

temporarily by inputting the PAUSE command. The state of this

VPM pin is the same as the contents of the VPM bit of the status

RSEL2

RSEL1

Number of serial registers

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