MC145540 Просмотр технического описания (PDF) - Motorola => Freescale

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MC145540

ADPCM Codec

Motorola => Freescale 

BCLKR

Bit Clock, Receive (Pin 26)

When used in the Long Frame Sync or Short Frame Sync mode, this pin accepts any bit clock frequency

from 64 to 5120 kHz. This pin may be used for applying an external 256 kHz clock for sequencing the

analog signal processing functions of this device. This is selected by the SCP port at BR0 (b7).

FSR

Frame Sync, Receive (Pin 27)

When used in the Long Frame Sync or Short Frame Sync mode, this pin accepts an 8 kHz clock that

synchronizes the input of the serial ADPCM data at the DR pin. FSR can operate asynchronous to FST

in the Long Frame Sync or Short Frame Sync mode.

FST (FSR)

BCLKT (BCLKR)

DT

1

2

3

4

5

6

7

8

DR

DON'T CARE

1

2

3

4

5

6

7

8

DON'T CARE

Figure 2-3. Long Frame Sync — 64 kbps PCM Data Timing

FST (FSR)

BCLKT (BCLKR)

DT

1

2

3

4

DR

DON'T CARE

1

2

3

4

DON'T CARE

Figure 2-4. Long Frame Sync — 32 kbps ADPCM Data Timing

FST (FSR)

BCLKT (BCLKR)

DT

1

2

3

DR

DON'T CARE

1

2

3

DON'T CARE

Figure 2-5. Long Frame Sync — 24 kbps ADPCM Data Timing

2-14

MC145540

MOTOROLA

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