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STM32F756VG 数据表(PDF) 37 Page - STMicroelectronics |
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STM32F756VG 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 228 page  DocID027589 Rev 4 37/228 STM32F756xx Functional overview 45 2.24 Universal synchronous/asynchronous receiver transmitters (USART) The device embeds USART. Refer to Table 8: USART implementation for the features implementation. The universal synchronous asynchronous receiver transmitter (USART) offers a flexible means of full-duplex data exchange with external equipment requiring an industry standard NRZ asynchronous serial data format. The USART peripheral supports: • Full-duplex asynchronous communications • Configurable oversampling method by 16 or 8 to give flexibility between speed and clock tolerance • Dual clock domain allowing convenient baud rate programming independent from the PCLK reprogramming • A common programmable transmit and receive baud rate of up to 27 Mbit/s when USART clock source is system clock frequency (Max is 216 MHz) and oversampling by 8 is used. • Auto baud rate detection • Programmable data word length (7 or 8 or 9 bits) word length • Programmable data order with MSB-first or LSB-first shifting • Programmable parity (odd, even, no parity) • Configurable stop bits (1 or 1.5 or 2 stop bits) • Synchronous mode and clock output for synchronous communications • Single-wire half-duplex communications • Separate signal polarity control for transmission and reception • Swappable Tx/Rx pin configuration • Hardware flow control for modem and RS-485 transceiver • Multiprocessor communications • LIN master synchronous break send capability and LIN slave break detection capability • IrDA SIR encoder decoder supporting 3/16 bit duration for normal mode • Smartcard mode ( T=0 and T=1 asynchronous protocols for Smartcards as defined in the ISO/IEC 7816-3 standard ) • Support for Modbus communication The table below summarizes the implementation of all U(S)ARTs instances Table 8. USART implementation features(1) USART1/2/3/6 UART4/5/7/8 Data Length 7, 8 and 9 bits Hardware flow control for modem X X Continuous communication using DMA X X Multiprocessor communication X X Synchronous mode X - |
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