Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
570
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
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.
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
respectively.
f MCKn
(
)
f GCLK I2S
–
n
–
(
)
MCKOUTDIV 1
+
(
)
----------------------------------------------------
=
f MCKn
(
)
8
SLOTSIZE 1
+
(
) NBSLOTS 1
+
(
) MCKDIV 1
+
(
)
⋅
⋅
⋅
MCKOUTDIV 1
+
(
)
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=