MSM9803 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9803

Voice Synthesis IC with Built-in Mask ROM

Oki Electric Industry 

¡ Semiconductor

MSM9802/03/05-xxx

FUNCTIONAL DESCRIPTION

1. Playback Code Specification

The user can specify a maximum of 56 phrases. Table 1.1 shows the settings by the A2-A0 and

SW2-SW0 pins.

Table 1.1 User-specified Phrases

A2-A0

000

SW2-SW0

000

001

111

111

2. Pull-up/Pull-down Resistor

Code Details

Inhibit code

User-specified phrase

(56 phrases)

The RESET and RND pins have internal pull-up resistors and the SW2-SW0 pins have internal

pull-down resistors.

3. Stand-alone Mode

In a stand-alone mode, the SW input interface function and the random playback function can

be used.

3.1 SW input interface

With the SW input interface, speech synthesis starts when the state of the SW2-SW0 pins has

changed. To prevent chattering, the address data is latched 16 ms (tCHA) after the state of SW2-

SW0 has changed. Voice synthesis does not start if the state of the A2-A0 pins has changed. Set

the RND pin to "H" level if the random playback function is not used.

Set the A2-A0 pins to "L" level at power-on or at reset.

The SW input interface is effective when the MSM9802/03/05 is operated using a push-button

switch. Voice synthesis starts when an address is changed by pressing the push-button switch.

If the push-button switch is released during playback, then playback stops after the current

phrase is completed.

A2-A0 (I)

SW2-SW1 (I) "L"

SW0 (I)

BUSY (O)

AOUT (O)

tw(SW)

tCHA

Oscillation start

Figure 3.1 SW Input Interface Single-Phrase Playback Timing

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