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STM32L475VC 数据表(PDF) 46 Page - STMicroelectronics |
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STM32L475VC 数据表(HTML) 46 Page - STMicroelectronics |
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46 / 193 page  Functional overview STM32L475xx 46/193 DocID027692 Rev 2 3.26 Universal synchronous/asynchronous receiver transmitter (USART) The STM32L475xx devices have three embedded universal synchronous receiver transmitters (USART1, USART2 and USART3) and two universal asynchronous receiver transmitters (UART4, UART5). These interfaces provide asynchronous communication, IrDA SIR ENDEC support, multiprocessor communication mode, single-wire half-duplex communication mode and have LIN Master/Slave capability. They provide hardware management of the CTS and RTS signals, and RS485 Driver Enable. They are able to communicate at speeds of up to 10Mbit/s. USART1, USART2 and USART3 also provide Smart Card mode (ISO 7816 compliant) and SPI-like communication capability. All USART have a clock domain independent from the CPU clock, allowing the USARTx (x=1,2,3,4,5) to wake up the MCU from Stop mode using baudrates up to 200 Kbaud.The wake up events from Stop mode are programmable and can be: • Start bit detection • Any received data frame • A specific programmed data frame All USART interfaces can be served by the DMA controller. Table 12. STM32L475xx USART/UART/LPUART features USART modes/features(1) USART1 USART2 USART3 UART4 UART5 LPUART1 Hardware flow control for modem XXXXX X Continuous communication using DMA XXXXX X Multiprocessor communication XXXXX X Synchronous mode X X X - - - Smartcard mode X X X - - - Single-wire half-duplex communication XXXXX X IrDA SIR ENDEC block XXXXX - LIN mode XXXXX - Dual clock domain XXXXX X Wakeup from Stop 0 / Stop 1 modes XXXXX X Wakeup from Stop 2 mode ----- X Receiver timeout interrupt XXXXX - Modbus communication XXXXX - Auto baud rate detection X (4 modes) - Driver Enable XXXXX X LPUART/USART data length 7, 8 and 9 bits 1. X = supported. |
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