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RM0008
Serial peripheral interface (SPI)
Table 167. Audio-frequency precision using standard 14.7456 MHz and PLL3 (connectivity line
devices only)
PREDIV2 PLL3 I2SDIV I2SODD
16-bit 32-bit 16-bit 32-bit 16-bit 32-bit 16-bit 32-bit
MCLK
Target
F S (Hz)
Real F S (kHz)
16-bit 32-bit
Error
16-bit 32-bit
3
6
3
6
10
20
10
20
16
32
8
16
0
0
0
0
No
No
96000
48000
96000
48000
96000
48000
0%
0%
0%
0%
11
11
20
20
19
9
0
1
No
44100
44095.69 44095.69 0.0098% 0.0098%
2
2
10
10
72
36
0
0
No
32000
32000
32000
0%
0%
11
11
10
10
19
9
0
1
No
22050
22047.84 22047.84 0.0098% 0.0098%
4
4
20
20
144
72
0
0
No
16000
16000
16000
0%
0%
2
2
10
10
209
104
0
1
No
11025
11023.92 11023.92 0.0098% 0.0098%
12
2
6
12
2
6
20
10
20
20
10
20
96
3
4
48
3
4
0
0
0
0
0
0
No
Yes
Yes
8000
96000
48000
8000
96000
48000
8000
96000
48000
0%
0%
0%
0%
0%
0%
2
2
10
10
6
6
1
1
Yes
44100
44307.69 44307.69 0.4710
0.4710%
2
2
10
10
9
9
0
0
Yes
32000
32000
32000
0%
0%
4
4
13
13
8
8
1
1
Yes
22050
22023.52 22023.52 0.1200% 0.1200%
4
4
20
20
18
18
0
0
Yes
16000
16000
16000
0%
0%
11
11
20
20
9
9
1
1
Yes
11025
11023.92 11023.92 0.0098% 0.0098%
6
6
20
20
24
24
0
0
Yes
8000
8000
8000
0%
0%
23.4.4
I 2 S master mode
The I 2 S can be configured in master mode. This means that the serial clock is generated on
the CK pin as well as the Word Select signal WS. Master clock (MCK) may be output or not,
thanks to the MCKOE bit in the SPI_I2SPR register.
Procedure
1.
2.
3.
Select the I2SDIV[7:0] bits in the SPI_I2SPR register to define the serial clock baud
rate to reach the proper audio sample frequency. The ODD bit in the SPI_I2SPR
register also has to be defined.
Select the CKPOL bit to define the steady level for the communication clock. Set the
MCKOE bit in the SPI_I2SPR register if the master clock MCK needs to be provided to
the external DAC/ADC audio component (the I2SDIV and ODD values should be
computed depending on the state of the MCK output, for more details refer to
Section 23.4.3: Clock generator ).
Set the I2SMOD bit in SPI_I2SCFGR to activate the I 2 S functionalities and choose the
I 2 S standard through the I2SSTD[1:0] and PCMSYNC bits, the data length through the
DATLEN[1:0] bits and the number of bits per channel by configuring the CHLEN bit.
Select also the I 2 S master mode and direction (Transmitter or Receiver) through the
I2SCFG[1:0] bits in the SPI_I2SCFGR register.
Doc ID 13902 Rev 9
609/995
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