STA027 datasheet(23/44 Pages) STMICROELECTRONICS

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STA027

5 Register description

CD00066274

23/44

Software Reset : 0

Description :

If OUTPUT_CONF == 1, configure the divider to generate the bit clock of the I2Sout interface,

called BCK0, from PCMCK. according the following relation : BCKO = PCMCK / 2 *

(PCM_DIV+1)

5.4.3

PCM_CONF :

Address : 0x68 (104)

Type : RW - DEC

Software Reset : 0

Description :

If OUTPUT_CONF == 1, configure the I2Sout interface according following table

Table 10.

CO6

CO5

CO4

CO3

CO2

CO1

CO0

Bit fields

Comment

CO[1:0]

0 : 16 bits mode (16 slots transmitted).

1 : 18 bits mode (18 slots transmitted).

2 : 20 bits mode (20 slots transmitted).

3 : 24 bits mode (24 slots transmitted).

CO2

Polarity of BCKO :

0 : data are sent on the falling edge & stable on the rising).

1 : (data are sent on the rising edge & stable on the falling).

CO3

0 : I2S format is selected

1 : other format is selected

CO4

Polarity of LRCKO :

0 : low->right, high->left).

1 : low->left, high->right so compliant to I2S format ).

CO5

0 : data are in the last BCKO cycles of LRCKO (right aligned data).

1 : data are in the first BCKO cycles of LRCKO (left aligned data).

CO6

0 : the transmission is LS bit first.

1 : the transmission is MS bit first.

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