5 V, 3.3 V and 2.5 V UART with 32-byte FIFOs and Infrared (IrDA) Encoder/Decoder

System Features

• Single channel
• 5 V, 3.3 V and 2.5 V operation
• 5 V tolerant on input only pins¹
• Industrial temperature range (-40 Cel to +85 Cel)
• After reset, all registers are identical to the typical 16C450 register set
• Capable of running with all existing generic 16C450 software
• Pin compatibility with the industry-standard ST16C450/550, TL16C450/550, PC16C450/550. Software compatible with ST16C650.
• Up to 3 Mbit/s transmit/receive operation at 5 V, 2 Mbit/s at 3.3 V, and 1 Mbit/s at 2.5 V
• 32 byte transmit FIFO
• 32 byte receive FIFO with error flags
• Programmable auto-RTS and auto-CTS
  • In auto-CTS mode, CTS controls transmitter
  • In auto-RTS mode, RX FIFO contents and threshold control RTS
• Automatic software/hardware flow control
• Programmable Xon/Xoff characters
• Software selectable baud rate generator
• Supports IrDA version 1.0 (up to 115.2 kbit/s)
• Four selectable Receive and Transmit FIFO interrupt trigger levels
• Standard modem interface or infrared IrDA encoder/decoder interface
• Sleep mode
• Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break)
• Independent receiver clock input
• Transmit, Receive, Line Status and Data Set interrupts independently controlled
• Fully programmable character formatting:
  • 5, 6, 7, or 8-bit characters
  • Even, odd, or no-parity formats
  • 1, 11/2, or 2-stop bit
  • Baud generation (DC to 3 Mbit/s)
• False start-bit detection
• Complete status reporting capabilities
• 3-state output TTL drive capabilities for bidirectional data bus and control bus
• Line break generation and detection
• Internal diagnostic capabilities:
  • Loopback controls for communications link fault isolation
• Prioritized interrupt system controls
• Modem control functions (CTS, RTS, DSR, DTR, RI, DCD)