MSM6654 datasheet(14/45 Pages) OKI

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¡ Semiconductor

MSM6650 Family

FEDL6650-03

Chip Enable.

CE is a timing output pin to control read of external memory.

This pin outputs when

RCS is at the "L" level. This pin goes high impedance

when

RCS is at the "H" level.

CPU

CPU Mode. Set to "L" level to select Standalone Mode. Set to "H" level to select

Microcontroller Interface Mode.

D0-D7

External Memory Data Bus. Data is input when

RCS is low. When RCS is

high, these pins become low due to internal pull-down resistors.

IBUSY

I Busy. Outputs a "L" level during voice playback (except during standby

conversion time), or when the AOUT pin is at half VDD level.

RA0-RA22

External Memory Address. These are address pins for an external memory

output when

RCS is low. These pins become high impedance status if RCS is in

"H" level.

RCS

Read Chip Select. The data bits D0-D7 are internally pulled down when

RCS

is high. Addresses and

CE are output when RCS is at "L" level. The RA22-RA0

address pins and

CE pin become high impedance.

STBY

Standby Contorl. If set to "L" level, the MSM6650 enters standby mode 0.2

seconds after voice ends. If set to "H" level, the MSM6650 AOUT output maintains

half VDD after voice ends.

STANDBY

Standby Indicator. This output pin remains at "L" level during oscillation.

TEST1, 3

Test. Set these pins to "H" level. The

TEST1 and TEST3 pins have internal pull-up

resistor.

TEST2

Test. Set this pin to "L" level.

30 (20)

16 (6)

32, 34-40

(22, 24-30)

18 (8)

41-63

(31-40, 42-54)

31 (21)

64 (55)

20 (10)

13, 28 (3, 18)

17 (7)

Symbol Type

Description

AGND

—

Analog ground pin.

DGND

—

Digital ground pin.

AVDD

—

Analog power pin. Insert a 0.1 mF or more bypass capacitor in between this pin and AGND.

DVDD

—

Digiral power pin. Insert a 0.1 mF or more bypass capacitor in between this pin and DGND.

6 (60)

7 (61)

8 (62)

9 (63)

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