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MSM9836-XXX

Voice Synthesis IC with Built-in Mask ROM

Oki Electric Industry 

¡ Semiconductor

MSM9836-xxx

PIN DESCRIPTIONS

Pin Symbol

17 RESET

20

NAR

7

EXTCK

23

VREF

24 AOUT

22

GND

1

VDD

2

XT

3

XT

5

TEST

8

ST

10-15, 18

6

I0 - I6

BUSY

Type

Description

The IC enters the standby state if this pin is set to "L" level. At this time, oscillation

stops and AOUT output becomes GND level, then the IC returns to the initial state.

I

Apply a "L" pulse upon power-on.

This pin has an internal pull-up resistor.

Signal output pin that indicates whether the 7-bit LATCH (see Block Diagram) is idle.

O NAR at "H" level indicates that the LATCH is empty and ST input is enabled.

Ceramic oscillator input/external clock input switching pin. Set to "H" level if ceramic

I

oscillation is used. Set to "L" level if external clock is used.

Volume setting pin. If this pin is set to GND level, the maximum current is forced in,

I and if set to VDD level, the minimum current is forced in.

An approx. 10 kW pull-down resistor is internally connected to this pin during operation.

Voice output pin.

O The voice signals are output as current changes. A "L" level signal is output through

this pin in standby state.

— Ground pin.

Power supply pin. Insert a bypass capacitor of 0.1 mF or more between this pin and

—

the GND pin.

Ceramic oscillator connection pin when ceramic oscillation is selected.

I

Input from this pin if external clock is used.

Ceramic oscillator connection pin when ceramic oscillation is selected.

O Leave this pin open if external clock is used.

A "L" level signal is output through this pin in standby state.

I Normally leave this pin open. This pin is used only for testing the internal circuit.

Voice synthesis starts at fall of ST, and addresses I0 to I6 are fetched at rise of ST.

I Input ST when NAR, the status signal, is at "H" level.

This pin has internal pull-up resistor.

I Phrase input pins corresponding to playback sound.

O This pin is at "H" level after reset is input. A "L" level signal is output through this pin

for the time during which voice is being played.

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