DESCRIPTION
The Philips Semiconductors SCC2692 Dual Universal Asynchronous Receiver/Transmitter (DUART) which is compatible with the SCN2681. It is a single-chip CMOS-LSI communications device that provides two full-duplex asynchronous receiver/transmitter channels in a single package. It interfaces directly with microprocessors and may be used in a polled or interrupt driven system.

FEATURES
• 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 115.2k baud
   – Non-standard rates to 115.2Kb
   – 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 7-bit input port
   – Can serve as clock or control inputs
   – Change of state detection on four inputs
   – Inputs have typically >100k 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
   – Output port can be configured to provide a total of up to six separate wire-ORable interrupt outputs
• Maximum data transfer rates: 1X – 1MB/sec, 16X – 125kB/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 +5V power supply