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STM32F411RET6 数据表(PDF) 30 Page - STMicroelectronics |
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STM32F411RET6 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 149 page  Functional overview STM32F411xC STM32F411xE 30/149 DocID026289 Rev 6 3.23 Serial peripheral interface (SPI) The devices feature five SPIs in slave and master modes in full-duplex and simplex communication modes. SPI1, SPI4 and SPI5 can communicate at up to 50 Mbit/s, SPI2 and SPI3 can communicate at up to 25 Mbit/s. The 3-bit prescaler gives 8 master mode frequencies and the frame is configurable to 8 bits or 16 bits. The hardware CRC generation/verification supports basic SD Card/MMC modes. All SPIs can be served by the DMA controller. The SPI interface can be configured to operate in TI mode for communications in master mode and slave mode. 3.24 Inter-integrated sound (I2S) Five standard I2S interfaces (multiplexed with SPI1 to SPI5) are available.They can be operated in master or slave mode, in simplex communication modes and full duplex for I2S2 and I2S3 and can be configured to operate with a 16-/32-bit resolution as an input or output channel. All the I2Sx audio sampling frequencies from 8 kHz up to 192 kHz are supported. When either or both of the I2S interfaces is/are configured in master mode, the master clock can be output to the external DAC/CODEC at 256 times the sampling frequency. All I2Sx can be served by the DMA controller. 3.25 Audio PLL (PLLI2S) The devices feature an additional dedicated PLL for audio I2S application. It allows to achieve error-free I2S sampling clock accuracy without compromising on the CPU performance. The PLLI2S configuration can be modified to manage an I2S sample rate change without disabling the main PLL (PLL) used for the CPU. The audio PLL can be programmed with very low error to obtain sampling rates ranging from 8 kHz to 192 kHz. Table 6. USART feature comparison USART name Standard features Modem (RTS/CTS) LIN SPI master irDA Smartcard (ISO 7816) Max. baud rate in Mbit/s (oversampling by 16) Max. baud rate in Mbit/s (oversampling by 8) APB mapping USART1 X X X X X X 6.25 12.5 APB2 (max. 100 MHz) USART2 X X X X X X 3.12 6.25 APB1 (max. 50 MHz) USART6 X N.A X X X X 6.25 12.5 APB2 (max. 100 MHz) |
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