STA016 datasheet(18/43 Pages) STMICROELECTRONICS

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STA016A

18/43

Type : RW - DEC

Software Reset : 10

Description :

This register must contain a MDIV value that enables

the system PLL to generate a frequency of 42.5 MHz

for the SYSCK.See table 4.

Default value at soft reset assume :

– external crystal provide a CRYCK running at

14.31818 MHz

6.4 I2Sout_CONFIGURATION registers

description

6.4.1

OUTPUT_CONF :

Address : 0x66 (102)

Type : RW - DEC

Software Reset : 0

Description :

If set to 1 enable the configurability of the PCM-

BLOCK Output thanks to following registers, else dis-

able this configurability and take embedded default

configuration for PCM-BLOCK registers.

Note that this embedded default configuration can be

retrieved by user thanks to following setting :

– PCM_DIV = 3;

–PCM_CONF = 0;

– PCM_CROSS = 0;

6.4.2

PCM_DIV :

Address : 0x67 (103)

Type : RW - DEC

Software Reset : 0

Description :

If OUTPUT_CONF == 1, configure the divider to gen-

erate the bit clock of the I2Sout interface, called

BCK0, from PCMCK. according the following relation

: BCKO = PCMCK / 2 * (PCM_DIV+1)

6.4.3

PCM_CONF :

Address : 0x68 (104)

Type : RW - DEC

Software Reset : 0

Description :

If OUTPUT_CONF == 1, configure the I2Sout inter-

face according following table

Table 12. .

6.4.4

PCM_CROSS :

Address : 0x69 (105)

Type : RW - DEC

Software Reset : 0

Description :

If OUTPUT_CONF == 1, CR[1:0] is used to configure

DV5DV4

DV3DV2

DV1DV0

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.

CR1

CR0

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