wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 54

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8351
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12.3.4
In Master Mode, ADCLRCLK and DACLRCLK are derived from BCLK via programmable dividers set
by ADCLRC_RATE and DACLRC_RATE. The BCLK frequency is derived from SYSCLK according
to BCLK_DIV, as described earlier in Table 11.
In Slave Mode, ADCLRCLK and DACLRCLK are generated externally and are input to the CODEC.
By default, the LRCLK pin provides the L/R Clock signal for the ADC and the DAC. If a separate L/R
Clock is required for the ADC and the DAC, then a GPIO pin must be configured as ADCLRCLK (or
ADCLRCB) as described in Section 20. The LRCLK pin can be driven by either ADCLRCLK or by
DACLRCLK in Master Mode; this is selected by the LRC_ADC_SEL bit as described in Table 13.
Master/Slave operation for ADCLRCLK is controlled by the ADCLRC_ENA register field.
Master/Slave operation for DACLRCLK is controlled by the DACLRC_ENA register field.
Table 13 ADCLRCLK / DACLRCLK Control
R70 (46h)
ADC LRC
Rate
R53 (35h)
DAC LRC
Rate
R41 (29h)
Clock
Control 2
REGISTER
ADDRESS
ADCLRCLK / DACLRCLK CONTROL
10:0
10:0
BIT
11
11
15
ADCLRC_ENA
ADCLRC_RATE
[10:0]
DACLRC_ENA
[10:0]
DACLRC_RATE
LRC_ADC_SEL
LABEL
BCLK/LRC)
BCLK/LRC)
DEFAULT
040h
040h
(64
(64
0
0
0
Enables the LRC generation for the
ADC
0 = disabled
1 = enabled
Determines the number of bit clocks
per LRC phase (when enabled)
00000000000 = invalid
...
00000000111 = invalid
00000001000 = 8 BCPS
…
11111111111 = 2047 BCPS
Enables DAC LRC generation in
Master mode
0 = disabled
1 = enabled
Determines the number of bit clocks
per LRC phase (when enabled)
00000000000 = invalid
...
00000000111 = invalid
00000001000 = 8 BCPS
…
11111111111 = 2047 BCPS
Selects either ADCLRCLK or
DACLRCLK to drive LRCLK pin in
Master Mode
0 = DACLRCLK
1 = ADCLRCLK
DESCRIPTION
PD, June 2009, Rev 4.1
Production Data
54