ST STM32F446 Series Reference Manual page 963

RM0390
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:14 COMP[1:0]: Companding mode.
These bits are set and cleared by software. The µ-Law and the A-Law log are a part of the CCITT
G.711 recommendation, the type of complement that will be used depends on CPL bit.
The data expansion or data compression are determined by the state of bit MODE[0].
The data compression is applied if the audio block is configured as a transmitter.
The data expansion is automatically applied when the audio block is configured as a receiver.
Refer to
00: No companding algorithm
01: Reserved.
10: µ-Law algorithm
11: A-Law algorithm
Note: Companding mode is applicable only when TDM is selected.
Bit 13 CPL: Complement bit.
This bit is set and cleared by software.
It defines the type of complement to be used for companding mode
0: 1's complement representation.
1: 2's complement representation.
Note: This bit has effect only when the companding mode is µ-Law algorithm or A-Law algorithm.
Bits 12:7 MUTECNT[5:0]: Mute counter.
These bits are set and cleared by software. They are used only in reception mode.
The value set in these bits is compared to the number of consecutive mute frames detected in
reception. When the number of mute frames is equal to this value, the flag MUTEDET will be set and
an interrupt will be generated if bit MUTEDETIE is set.
Refer to
Bit 6 MUTEVAL: Mute value.
This bit is set and cleared by software.It must be written before enabling the audio block: SAIEN.
This bit is meaningful only when the audio block operates as a transmitter, the number of slots is
lower or equal to 2 and the MUTE bit is set.
If more slots are declared, the bit value sent during the transmission in mute mode is equal to 0,
whatever the value of MUTEVAL.
if the number of slot is lower or equal to 2 and MUTEVAL = 1, the MUTE value transmitted for each
slot is the one sent during the previous frame.
Refer to
0: Bit value 0 is sent during the mute mode.
1: Last values are sent during the mute mode.
Note: This bit is meaningless and should not be used for SPDIF audio blocks.
Bit 5 MUTE: Mute.
This bit is set and cleared by software. It is meaningful only when the audio block operates as a
transmitter. The MUTE value is linked to value of MUTEVAL if the number of slots is lower or equal
to 2, or equal to 0 if it is greater than 2.
Refer to
0: No mute mode.
1: Mute mode enabled.
Note: This bit is meaningless and should not be used for SPDIF audio blocks.
Section : Companding mode
Section : Mute mode for more details.
Section : Mute mode for more details.
Section : Mute mode for more details.
for more details.
RM0390 Rev 4
Serial audio interface (SAI)
963/1328
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