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STM32F405 数据表(PDF) 35 Page - STMicroelectronics |
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STM32F405 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 204 page  DS8626 Rev 9 35/203 STM32F405xx, STM32F407xx Description 2.2.24 Serial peripheral interface (SPI) The STM32F40xxx feature up to three SPIs in slave and master modes in full-duplex and simplex communication modes. SPI1 can communicate at up to 42 Mbits/s, SPI2 and SPI3 can communicate at up to 21 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. 2.2.25 Inter-integrated sound (I2S) Two standard I2S interfaces (multiplexed with SPI2 and SPI3) are available. They can be operated in master or slave mode, in full duplex and half-duplex communication modes, and can be configured to operate with a 16-/32-bit resolution as an input or output channel. 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. Table 5. 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 5.25 10.5 APB2 (max. 84 MHz) USART2 X X X X X X 2.62 5.25 APB1 (max. 42 MHz) USART3 X X X X X X 2.62 5.25 APB1 (max. 42 MHz) UART4 X - X - X - 2.62 5.25 APB1 (max. 42 MHz) UART5 X - X - X - 2.62 5.25 APB1 (max. 42 MHz) USART6 X X X X X X 5.25 10.5 APB2 (max. 84 MHz) |
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