AT32F421 Series Reference Manual
2022.11.11 Page 9 Rev 2.02
13.2.6 DMA transfer .............................................................................. 153
13.2.7 Transmitter ................................................................................ 154
13.2.8 Receiver .................................................................................... 154
13.2.9 Motorola mode ........................................................................... 155
13.2.10 Interrupts ................................................................................ 157
13.2.11 IO pin control .......................................................................... 158
13.2.12 Precautions ............................................................................. 158
13.3 I2S functional description ........................................................... 158
13.3.1 I
2
S introduction .......................................................................... 158
13.3.2 Operation mode selector ............................................................. 159
13.3.3 Audio protocol selector ............................................................... 160
13.3.4 I2S_CLK controller ..................................................................... 161
13.3.5 DMA transfer .............................................................................. 163
13.3.6 Transmitter/Receiver .................................................................. 164
13.3.7 I2S communication timings ......................................................... 165
13.3.8 Interrupts ................................................................................... 165
13.3.9 IO pin control ............................................................................. 165
13.4 SPI registers ............................................................................. 166
13.4.1 SPI control register1 (SPI_CTRL1) (Not used in I
2
S mode) ........... 166
13.4.2 SPI control register2 (SPI_CTRL2) .............................................. 167
13.4.3 SPI status register (SPI_STS) ..................................................... 168
13.4.4 SPI data register (SPI_DT) ......................................................... 168
13.4.5 SPICRC register (SPI_CPOLY) (Not used in I
2
S mode) ................. 168
13.4.6 SPIRxCRC register (SPI_RCRC) (Not used in I
2
S mode) .............. 169
13.4.7 SPITxCRC register (SPI_TCRC) .................................................. 169
13.4.8 SPI_I2S configuration register (SPI_I2SCTRL) ............................. 169
13.4.9 SPI_I2S prescaler register (SPI_I2SCLKP) .................................. 170
14 Timer .......................................................................................... 171
14.1 General-purpose timer (TMR6) .................................................... 172
14.1.1 TMR6 introduction ...................................................................... 172
14.1.2 TMR6 main features ................................................................... 172
14.1.3 TMR6 functional overview ........................................................... 172
14.1.3.1 Count clock .......................................................................... 172
14.1.3.2 Counting mode ..................................................................... 172
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