Datasheet
In mono format, Transmit mode, data written to the left channel is duplicated to the right output channel.
In mono format, Receiver mode, data received from the right channel is ignored and data received from
the left channel is duplicated in to the right channel.
In mono format, TDM Transmit mode with more than two slots, data written to the even-numbered slots is
duplicated in to the following odd-numbered slot.
In mono format, TDM Receiver mode with more than two slots, data received from the even-numbered
slots is duplicated in to the following odd-numbered slot.
Mono format can be enabled by writing a '1' to the MONO bit in the Serializer m Control register
(SERCTRLm.MONO).
I
2
S support different data frame formats:
• 2-channel I
2
S with Word Select
• 1- to 8-slot Time Division Multiplexed (TDM) with Frame Sync and individually enabled slots
• 1- or 2-channel Pulse Density Modulation (PDM) reception for MEMS microphones
• 1-channel burst transfer with non-periodic Frame Sync
In 2 channel I
2
S mode, number of slots configured is one or two and successive data words corresponds
to left and right channel. Left and right channel are identified by polarity of Word Select signal (FSn
signal). Each frame consists of one or two data word(s). In the case of compact stereo format, the
number of slots can be one. When 32-bit slot size is used, the number of slots can be two.
In TDM format, number slots can be configured up to 8 slots. If 4 slots are configured, each frame
consists of 4 data words.
In PDM format, continuous 1-bit data samples are available on the SDI line for each SCKn rising and
SCKn falling edge as in case of a MEMS microphone with PDM interface.
1-channel burst transfer with non-periodic Frame Sync mode is useful typically for passing control non-
auto data as in case of DSP. In Burst mode, a single Data transfer starts at each Frame Sync pulse, and
these pulses are 1-bit wide and occur only when a Data transfer is requested.
Sections 29.6.4 I2S Format - Reception and Transmission Sequence with Word Select, 29.6.5 TDM
Format - Reception and Transmission Sequence and 29.7 I2S Application Examples describe more
about frame/data formats and register settings required for different I
2
S applications.
SAM D21 Family
I2S - Inter-IC Sound Controller
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 630