RM0444 Rev 5 1087/1390
RM0444 Low-power universal asynchronous receiver transmitter (LPUART)
1138
34.2 LPUART main features
• Full-duplex asynchronous communications
• NRZ standard format (mark/space)
• Programmable baud rate
• From 300 baud/s to 9600 baud/s using a 32.768 kHz clock source.
• Higher baud rates can be achieved by using a higher frequency clock source
• Two internal FIFOs to transmit and receive data
Each FIFO can be enabled/disabled by software and come with status flags for FIFOs
states.
• Dual clock domain with dedicated kernel clock for peripherals independent from PCLK.
• Programmable data word length (7 or 8 or 9 bits)
• Programmable data order with MSB-first or LSB-first shifting
• Configurable stop bits (1 or 2 stop bits)
• Single-wire Half-duplex communications
• Continuous communications using DMA
• Received/transmitted bytes are buffered in reserved SRAM using centralized DMA.
• Separate enable bits for transmitter and receiver
• Separate signal polarity control for transmission and reception
• Swappable Tx/Rx pin configuration
• Hardware flow control for modem and RS-485 transceiver
• Transfer detection flags:
– Receive buffer full
– Transmit buffer empty
– Busy and end of transmission flags
• Parity control:
– Transmits parity bit
– Checks parity of received data byte
• Four error detection flags:
– Overrun error
– Noise detection
– Frame error
– Parity error
• Interrupt sources with flags
• Multiprocessor communications: wakeup from Mute mode by idle line detection or
address mark detection
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