MC145540 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145540

ADPCM Codec

Motorola => Freescale 

SCP EN

Serial Control Port Enable Input (Pin 14)

This pin, when held low, selects the Serial Control Port (SCP) for the transfer of control and status

information into and out of the MC145540 ADPCM Codec. This pin should be held low for a total of 16

periods of the SCP CLK signal in order for information to be transferred into or out of the MC145540

ADPCM Codec. The timing relationship between SCP EN and SCP CLK is shown in Figures 2-8

through 2-11.

SCP CLK

Serial Control Port Clock Input (Pin 15)

This input to the device is used for controlling the rate of transfer of data into and out of the SCP Inter-

face. Data are clocked into the MC145540 ADPCM Codec from SCP Rx on rising edges of SCP CLK.

Data are shifted out of the device on SCP Tx on falling edges of SCP CLK. SCP CLK can be any fre-

quency from 0 to 4.096 MHz. An SCP transaction takes place when SCP EN is brought low. Note that

SCP CLK is ignored when SCP EN is high (i.e., it may be continuous or it can operate in a burst mode).

SCP Tx

Serial Control Port Transmit Output (Pin 16)

SCP Tx is used to output control and status information from the MC145540 ADPCM Codec. Data are

shifted out of SCP Tx on the falling edges of SCP CLK, most significant bit first.

SCP Rx

Serial Control Port Receive Input (Pin 17)

SCP Rx is used to input control and status information to the MC145540 ADPCM Codec. Data are

shifted into the device on rising edges of SCP CLK. SCP Rx is ignored when data are being shifted out

of SCP Tx or when SCP EN is high.

MOTOROLA

MC145540

2-17

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