The TX pin is in a low state during the start bit. Transmission and reception are driven by a common baud rate generator, the clock for each is generated when the enable bit is set respectively for the transmitter and receiver. Word length may be selected as being either 8 or 9 bits by programming the M bit in the USART_CR1 register. And also an IrDA decoder circuitry, and interrupt control unit to generate various interrupt signals on different USART hardware events. There exist a hardware data flow control unit to support this feature. There is an address register for multi-processor communication mode. Both shift registers which shift-in or out the data during reception/transmission are being clocked at the rate of the BRG (baud rate generator) circuitry at the bottom of the diagram. The CTS & RTS pins are required in Hardware flow control mode.Īs you can easily spot in the digital block diagram for this UART hardware module, there are two separate shift registers and double-buffered in/out data for a full-duplex data transmission and reception operation. The CK pin is required to interface in synchronous mode. Through these pins, serial data is transmitted and received in normal USART mode. In this section, we’ll get a deep insight into the STM32 USART module hardware, its block diagram, functionalities, BRG, modes of operations, and data reception/transmission.Īny USART bidirectional communication requires a minimum of two pins: Receive Data In ( RX) and Transmit Data Out ( TX). ![]() 4 error detection flags: ( Overrun error – Noise error – Frame error – Parity error).Transfer detection flags: ( Receive buffer full – Transmit buffer empty – End of Transmission flags).Separate enable bits for Transmitter and Receiver.Configurable multi-buffer communication using DMA (direct memory access) – Buffering of received/transmitted bytes in reserved SRAM using centralized DMA.IrDA SIR Encoder-Decoder – Support for 3/16 bit duration for normal mode. ![]()
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