LM4560 datasheet(40/54 Pages) NSC

40 / 54 page

4.0 Functional Description (Continued)

1 Reserved

4.2.1.5.2 Command 10h

Function: 8-bit direct mode playback

4.2.1.5.3 Command 14h

Function: 8-bit normal DMA playback

Length = number of bytes to be transferred - 1

SB ESP will generate an interrupt after the specified length of data has been transferred.

4.2.1.5.4 Command 16h/17h

Function: SB ADPCMDMA playback

Length = number of bytes to be transferred - 1

These two commands are not supported.

4.2.1.5.5 Command 1Ch

Function: 8-bit continuous DMA playback

SB ESP will generate an interrupt after each block length of data has been transferred.

4.2.1.5.6 Command 1Eh/1Fh

Function: SB ADPCMDMA playback

These two commands are not supported.

4.2.1.6 8-Bit Recording Only Command 2xh

SB ESP uses SBMX0E.1 to do mono/stereo recording.

SBMX0E.1 = 0 for mono recording.

1 for stereo recording.

4.2.1.6.1 Command Bit Definition

Bit 3

0 Direct Mode or Normal DMA Mode

1 Continuous DMA Mode

Bit 2

0 Direct Mode

1 DMA Mode

Bit 1 X reserved

Bit 0 X reserved

4.2.1.6.2 Command 20h

Function: 8-bit direct mode recording

4.2.1.6.3 Command 24h

Function: 8-bit normal DMA recording

Length = number of bytes to be transferred - 1

SB ESP will generate an interrupt after the specified length of data has been transferred.

4.2.1.6.4 Command 2Ch

Function: 8-bit continuous DMA recording

SB ESP will generate an interrupt after each block length of data has been transferred.

4.2.1.7 Set Sample Rate And Continuous/Special Dma Block Length Command 4xh

4.2.1.7.1 Command 40h

Function: Set Sample Rate by Time Constant

Time_Constant = 256d − (1,000,000d / (Channel * Sampling Rate))

Channel = 1 for mono or SB16 command, 2 for stereo of SBPRO command

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