SN56040

4-Channel Speech Controller

5.6. Auto repetition

Auto repetition function helps SN56000 series realize a “looping” sound automatically

by hardware without any software effort. Auto repetition function is a very useful

mechanism to implement “Sustain” sound in instrument synthesis. All 4 channels are

equipped with this function. Arbitrary lengths of looping sound are accepted by

SN56000 series.

5.7. Wave Mark

This is a new function for SN56000 series, it allows user to add a special mark in wave

data by the voice edit tool “CoolEdit”, ”Goldwav”, “SoundForge”. User can insert

event tags in anywhere of his wave file and can easy to get this special code to do his

special action during voice playing. That means, it should be easily to control the I/O

(such as LED or Motor) and other actions to synchronize with voice.

5.8. Push-Pull output

A Push-Pull Direct Drive circuit is built-in SN56040. The maximum resolution of

designed in SN56040. With this advanced circuit, the chip is capable of driving

speaker directly without external transistors.

5.9. Volume Control Function

Bit0~Bit2 of VOL Register is applied to control the volume of voice. The relationship

between output current and mode2 register is listed in the following table (power on set

to 111). Bit3 of VOL register provide for VOL Output division 2.

Bit2

Bit1

Bit0

Output Volume

0

0

0

46.5 DB

0

0

1

52.2 DB

0

1

0

58.1 DB

0

1

1

63.9 DB

1

0

0

70.3 DB

1

0

1

77.2 DB

1

1

0

82.3 DB

1

1

1

88.0 DB

Ver: 1.0

March 2,2005

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