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STM32F217VG 数据表(PDF) 28 Page - STMicroelectronics |
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STM32F217VG 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 173 page  Description STM32F21xxx 28/173 Doc ID 17050 Rev 8 2.2.23 Serial peripheral interface (SPI) The STM32F21x devices feature up to three SPIs in slave and master modes in full-duplex and simplex communication modes. SPI1 can communicate at up to 30 Mbits/s, while SPI2 and SPI3 can communicate at up to 15 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. 2.2.24 Inter-integrated sound (I2S) Two standard I2S interfaces (multiplexed with SPI2 and SPI3) are available. They can operate in master or slave mode, in half-duplex communication modes, and can be configured to operate with a 16-/32-bit resolution as input or output channels. 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 interfaces can be served by the DMA controller. Table 4. 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 1.87 7.5 APB2 (max. 60 MHz) USART2 X X X X X X 1.87 3.75 APB1 (max. 30 MHz) USART3 X X X X X X 1.87 3.75 APB1 (max. 30 MHz) UART4 X - X - X - 1.87 3.75 APB1 (max. 30 MHz) UART5 X - X - X - 3.75 3.75 APB1 (max. 30 MHz) USART6 X X X X X X 3.75 7.5 APB2 (max. 60 MHz) |
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