MSM9844 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9844

VOICE SYNTHESIS LSI with on-chip FIFO Memory

Oki Electric Industry 

¡ Semiconductor

MSM9844

Pin No.

52

44

43

54

55

46

33

47,48

45,26

28

29

31

21,49

30

22

Symbol

IOW

I/O

Description

When DMA Transfer selected, the signal to start writing external memory

I data to the MSM9844 is entered to this pin.

When DMA Transfer is not use, keep the pin "H".

DASD

O 16-bit serial data output pin when the external DAC is in use.

SIOCK

Synchronizing clock signal for 16-bit serial data input/output when the

I / O external DAC is in use.

XT

I Pins wired to the oscillator, When the external clock is used, input the

XT

O clock signal to the XT pin and keep the /XT pin open.

VCK

I/O

Input/Output the sampling frequency in use. The signal is used as the

synchronizing signal when the external DAC is in use.

RESET

I "L" level input to this pin turns the LSI to the initial status.

TEST0,1

TEST2,3

I Pins for testing the LSI. Keep these pins "L".

AOUTL

O

The left channel output from the built-in LPF. Analog waveform output can

be directly connected to an amplifirer to drive a speaker.

AOUTR

O

The right channel output from the built-in LPF. Analog waveform output can

be directly connected to an amplifirer to drive a speaker.

DVDD

DGND

Digital power supply pin. Insert a 0.1µF or larger bypass capacitor

between this pin and the DGND pin.

Digital GND pin.

AVDD

Analog power supply pin. Insert a 0.1µF or larger bypass capacitor

between this pin and the AGND pin.

AGND

Analog GND pin.

Page5

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