MSC SM2S-IMX8MINI 40 / 87
User Manual
4.11 UART
The i.MX8M Mini offers four separate UART interfaces that are linked to the SMARC™ connector, two of them with Hardware flow control support
signals.
The UART interfaces supports Serial RS-232NRZ mode, 9-bit RS-485 mode or IrDA mode and includes the following features amongst others:
• High-speed TIA/EIA-232-F compatible, up to 5.0 Mbit/s
• Serial IR interface low-speed, IrDA-compatible (up to 115.2 Kbit/s)
• 9-bit or Multidrop mode (RS-485) support (automatic slave address detection)
• 7 or 8 data bits for RS-232 characters, or 9 bit RS-485 format
• 1 or 2 stop bits
• Programmable parity (even, odd, and no parity)
• Hardware flow control support for request to send (RTS_B) and clear to send (CTS_B) signals
• RS-485 driver direction control via CTS_B signal
• Edge-selectable RTS_B and edge-detect interrupts
• Status flags for various flow control and FIFO states
• Voting logic for improved noise immunity (16x oversampling)
• Transmitter FIFO empty interrupt suppression
• UART internal clocks enable/disable
• Auto baud rate detection (up to 115.2 Kbit/s)
• Receiver and transmitter enable/disable for power saving
• RX_DATA input and TX_DATA output can be inverted respectively in RS-232/RS-485 mode
• Maskable interrupts
• Two DMA Requests (TxFIFO DMA Request and RxFIFO DMA Request)
• Escape character sequence detection
• Software reset (SRST_B)
• Two independent, 32-entry FIFOs for transmit and receive
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