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STM32F401 数据表(PDF) 30 Page - STMicroelectronics |
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STM32F401 数据表(HTML) 30 Page - STMicroelectronics |
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30 / 135 page  Functional overview STM32F401xD STM32F401xE 30/135 DocID025644 Rev 3 3.22 Serial peripheral interface (SPI) The devices feature up to four SPIs in slave and master modes in full-duplex and simplex communication modes. SPI1 and SPI4 can communicate at up to 42 Mbit/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. 3.23 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 simplex 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. 3.24 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. In addition to the audio PLL, a master clock input pin can be used to synchronize the I2S flow with an external PLL (or Codec output). 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 5.25 10.5 APB2 (max. 84 MHz) USART2 X X X X X X 2.62 5.25 APB1 (max. 42 MHz) USART6 X N.A X X X X 5.25 10.5 APB2 (max. 84 MHz) |
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