wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 41

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

Pre Production
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AUDIO INTERFACE CONTROL
The register bits controlling audio format, word length and master / slave mode are summarised
below.
Register bit MS selects audio interface operation in master or slave mode. In Master mode BCLK,
and FRAME are outputs. The frequency of BCLK and FRAME in master mode are controlled with
BCLKDIV. These are divided down versions of master clock. This may result in short BCLK pulses
at the end of a frame if there is a non-integer ratio of BCLKs to FRAME clocks.
Table 29 Audio Interface Control
Note: Right Justified Mode will only operate with a maximum of 24 bits. If 32-bit mode is selected the
device will operate in 24-bit mode.
R4
Audio interface
control
R5
Companding
Control
REGISTER
ADDRESS
9
8
7
6:5
4:3
1
5
BIT
LOUTR
BCP
FRAMEP
WL
FMT
ALRSWAP
WL8
LABEL
0
0
0
10
10
0
0
DEFAULT
LOUTR control
0=normal
1=Input mono channel data output on
both left and right channels
BCLK polarity
0=normal
1=inverted
Frame clock polarity (for RJ, LJ and I
formats)
0=normal
1=inverted
DSP Mode control
1 = Configures interface so that MSB is
available on 1st BCLK rising edge after
FRAME rising edge
0 = Configures interface so that MSB is
available on 2nd BCLK rising edge after
FRAME rising edge
Word length
00 = 16 bits
01 = 20 bits
10 = 24 bits
11 = 32 bits (see note)
Audio interface Data Format Select:
00=Right Justified
01=Left Justified
10=I
11= DSP/PCM mode
Controls whether ADC data appears in
‘right’ or ‘left’ phases of FRAME clock:
0=ADC data appear in ‘left’ phase of
FRAME
1=ADC data appears in ‘right’ phase of
FRAME
8 Bit Word Length Enable
Only recommended for use with
companding
0=Word Length controlled by WL
1=8 bits
2
S format
PP, Rev 3.0, December 2008
DESCRIPTION
WM8952
2
S
41