Dual Asynchronous Receiver/Transmitter (DUART)


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  • S68000 bus compatible
  • Dual full-duplex asynchronous receiver/transmitters
  • Quadruple buffered receiver data register
  • Programmable data format:
    • 5 to 8 data bits plus parity
    • Odd, even, no parity or force parity
    • 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
  • 16-bit programmable Counter/Timer
  • Programmable baud rate for each receiver and transmitter selectable from:
    • 22 fixed rates: 50 to 115.2 k baud
    • Non-standard rates to 115.2 kb
    • Non-standard user-defined rate derived from programmable counter/timer
    • External 1X or 16X clock
  • Parity, framing, and overrun error detection
  • False start bit detection
  • Line break detection and generation
  • Programmable channel mode
    • Normal (full-duplex)
    • Automatic echo
    • Local loopback
    • Remote loopback
    • Multidrop mode (also called ?wake-up? or ?9-bit?)
  • Multi-function 6-bit input port
    • Can serve as clock or control inputs
    • Change of state detection on four inputs
    • Inputs have typically >100 k Ω pull-up resistors
  • Multi-function 8-bit output port
    • Individual bit set/reset capability
    • Outputs can be programmed to be status/interrupt signals
  • Versatile interrupt system
    • Single interrupt output with eight maskable interrupting conditions
    • Interrupt vector output on interrupt acknowledge
    • Output port can be configured to provide a total of up to six separate wire-ORable interrupt outputs
  • Maximum data transfer rates: 1X ? 1 MB/sec, 16X ? 125 kB/sec
  • Automatic wake-up mode for multidrop applications
  • Start-end break interrupt/status
  • Detects break which originates in the middle of a character
  • On-chip crystal oscillator
  • Power down mode
  • Receiver timeout mode
  • Commercial and Industrial temperature range versions
  • TTL compatible
  • Single +5 V power supply


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