Data Sheet

582
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
If a Master Clock output is not required, the GCLK_I2S generic clock is used as SCKn, by writing a zero to
CLKCTRLn.MCKDIV. Alternatively, if the frequency of the generic clock used is a multiple of the required SCKn
frequency, the MCKn to SCKn divider can be used with the ratio defined by writing the CLKCTRLn.MCKDIV field.
The FSn pin is used as Word Select in I
2
S format and as Frame Synchronization in TDM format, as described in “I2S
Format - Reception and Transmission Sequence with Word Select” on page 584 and “TDM Format - Reception and
Transmission Sequence” on page 585 respectively.
f MCKn()
fGCLK
I2S
–
n
–
()
MCKOUTDIV 1+()
----------------------------------------------------
=
f MCKn()
8 SLOTSIZE 1+()NBSLOTS 1+()MCKDIV 1+()⋅⋅⋅
MCKOUTDIV 1+()
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=