DocID13902 Rev 15 724/1128
RM0008 Serial peripheral interface (SPI)
742
Table 183, Table 184 and Table 185 provide example precision values for different clock
configurations.
Note: Other configurations are possible that allow optimum clock precision.
Table 183. Audio-frequency precision using standard 8 MHz HSE (high-density and XL-density
devices only)
SYSCLK
(MHz)
I2S_DIV I2S_ODD
MCLK
Target f
S
(Hz)
Real f
S
(KHz) Error
16-bit 32-bit 16-bit 32-bit 16-bit 32-bit 16-bit 32-bit
72 11 6 1 0 No 96000 97826.09 93750 1.90% 2.34%
72 23 11 1 1 No 48000 47872.34 48913.04 0.27% 1.90%
72 25 13 1 0 No 44100 44117.65 43269.23 0.04% 1.88%
72 35 17 0 1 No 32000 32142.86 32142.86 0.44% 0.44%
72 51 25 0 1 No 22050 22058.82 22058.82 0.04% 0.04%
72 70 35 1 0 No 16000 15675.75 16071.43 0.27% 0.45%
72 102 51 0 0 No 11025 11029.41 11029.41 0.04% 0.04%
72 140 70 1 1 No 8000 8007.11 7978.72 0.09% 0.27%
72 2 2 0 0 Yes 96000 70312.15 70312.15 26.76% 26.76%
72 3 3 0 0 Yes 48000 46875 46875 2.34% 2.34%
72 3 3 0 0 Yes 44100 46875 46875 6.29% 6.29%
72 9 9 0 0 Yes 32000 31250 31250 2.34% 2.34%
72 6 6 1 1 Yes 22050 21634.61 21634.61 1.88% 1.88%
72 9 9 0 0 Yes 16000 15625 15625 2.34% 2.34%
72 13 13 0 0 Yes 11025 10817.30 10817.30 1.88% 1.88%
72 17 17 1 1 Yes 8000 8035.71 8035.71 0.45% 0.45%
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