ST2202 datasheet(31/65 Pages) ETC

31 / 65 page

Sitronix

ST2202

Ver 2.0a

31/65

2003-May-05

4.. P

14.1 Function description

The built-in dual channel Programmable Sound Generator

(PSG) is controlled by register file directly. Its flexibility makes it

useful in applications such as music synthesis, sound effects

generation, audible alarms and tone signaling. In order to

generate sound effects while allowing the processor to perform

other tasks, the PSG can continue to produce sound after the

initial commands have been given by the CPU. The structure of

PSG was shown in FIGURE 14-2 and the PSG clock source is

shown in FIGURE 14-1. The ST2202 has three PSG playing

type. One for channel0(C0) & channel1(C1) square type tone

sound playing. Second for ch0 square tone sound and ch1

noise sound. The third sound playing type is DAC PCM playing.

OSCX

PSGC[6~4]

IN0

IN1

Output

Select

PSG Selector

PSGCK

PSGC

SYSCK

PSGCK

SYSCK/2

SYSCK/4

SYSCK/8

SYSCK x 2

OSCX

B6 B5 B4

FIGURE 14-1 PSG Clock Source Control

Enable Output

Enable

LOAD

Output

MUX2

IN0

IN1

OUTPUT

SEL

MUX2

IN0

IN1

OUTPUT

SEL

MUX2

IN0

IN1

OUTPUT

SEL

MIXER

CH1

Output

Vol_CH1

DACE

C1TEN

C1Tone

C1out

DACE

PSGC[2]

C1NEN

C1Noise

PSGC[3]

PSG0

C1out

VOL[1~0]

PSG1

BDB

DACE

To Port B

From DAC Generator

Channel 1 Tone

Channel 1 Noise

Preload Data Before First Count

FIGURE 14-2 PSG Block Diagram

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