ST2202 datasheet(34/65 Pages) ETC

34 / 65 page

Sitronix

ST2202

Ver 2.0a

34/65

2003-May-05

TABLE 14-3 PSG Control Register (PSGC)

Address Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

PCK[2]

PCK[1]

PCK[0]

PRBS

C1EN

C0EN

DACE=0

- 000 0000

$016

PSGC

PCK[2]

PCK[1]

PCK[0]

DMD[1] DMD[0]

INH

DACE=1

- 000 0000

Bit 0:

DACE : Tone(Noise) or DAC Generator selection bit

1 = PSG is used as the DAC generator

0 = PSG is used as the Tone (Noise) generator

Bit 1:

C0EN : PSG channel 0 (Tone) enable bit

1 = PSG0 (Tone) enable

0 = PSG0 (Tone) disable

Bit 2:

C1EN : PSG channel 1 (Tone or Noise) enable bit

1 = PSG1 (Tone or Noise) enable

0 = PSG1 (Tone or Noise) disable

Bit 3:

PRBS : Tone or Noise generator selection bit

1 = Noise generator

0 = Tone generator

14.3 Noise Generator Control

14.3.1 General description

Noise generator is shown in FIGURE 14-5, which base frequency is controlled by PSG1[5~0].

PSG1[5~0]

PSGCK

Noise Prescaler

C1N[5~0]

CLOCK

OUTPUT

NCK

CLOCK

OUTPUT

16-Stage White Noise Generator

Noise out

NCK Frequency = PSGCK/(40H-PSG1[5~0])

FIGURE 14-5 Noise Generator

14.3.2 Noise Generator Programming

DACE defines noise or DAC function. Writing a “1” to C1EN

will enable noise generator when PSG is in noise mode.

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