WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 78

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8985
AUDIO SAMPLE RATES
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Table 44 Clock Control
Table 45 Sample Rate Control
The WM8985 ADC high pass filter, ALC and DAC limiter characteristics are sample rate dependent.
SR should be set to the correct sample rate or the closest value if the actual sample rate is not
available.
If a sample rate that is not explicitly supported by the SR register settings is required then the
closest SR value to that sample rate should be chosen. The filter characteristics and the ALC attack
decay and hold times will scale appropriately.
R6 (06h)
Clock
Generation
Control
R7 (07h)
Additional
Control
REGISTER
REGISTER
ADDRESS
ADDRESS
0
4:2
7:5
8
3:1
BIT
BIT
MS
BCLKDIV
MCLKDIV
CLKSEL
SR
LABEL
LABEL
000
DEFAULT
0
000
010
1
DEFAULT
Sets the chip to be master over LRC
and BCLK
0 = BCLK and LRC clock are inputs
1 = BCLK and LRC clock are outputs
generated by the WM8985 (MASTER)
Configures the BCLK output frequency,
for use when the chip is master over
BCLK.
000 = divide by 1 (BCLK=SYSCLK)
001 = divide by 2 (BCLK=SYSCLK/2)
010 = divide by 4 (BCLK=SYSCLK/4)
011 = divide by 8 (BCLK=SYSCLK/8)
100 = divide by 16 (BCLK=SYSCLK/16)
101 = divide by 32 (BCLK=SYSCLK/32)
110 = reserved
111 = reserved
Sets the scaling for SYSCLK clock
output (under control of CLKSEL)
000 = divide by 1 (LRC=SYSCLK/128)
001 = divide by 1.5 (LRC=SYSCLK/192)
010 = divide by 2 (LRC=SYSCLK/256)
011 = divide by 3 (LRC=SYSCLK/384)
100 = divide by 4 (LRC=SYSCLK/512)
101 = divide by 6 (LRC=SYSCLK/768)
110 = divide by 8 (LRC=SYSCLK/1024)
111 = divide by 12 (LRC=SYSCLK/1536)
Controls the source of the clock for all
internal operation:
0 = MCLK
1 = PLL output
Approximate sample rate (configures the
coefficients for the internal digital filters):
000 = 48kHz
001 = 32kHz
010 = 24kHz
011 = 16kHz
100 = 12kHz
101 = 8kHz
110-111 = reserved
DESCRIPTION
DESCRIPTION
PP, Rev 3.5, March 2007
Pre-Production
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