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DESCRIPTION
The Philips Semiconductors SCC2691 Universal Asynchronous Receiver/Transmitter (UART) is a single-chip CMOS-LSI communications device that provides a full-duplex asynchronous receiver/transmitter. It is fabricated with Philips Semiconductors CMOS technology which combines the benefits of high density and low power consumption.

FEATURES
• Full-duplex asynchronous receiver/transmitter
• 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
• Baud rate for the 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 timer/ counter
    – External 1X or 16X clock
• Parity, framing, and overrun detection
• False start bit detection
• Line break detection and generation
• Programmable channel mode
    – Normal (full-duplex)
    – Automatic echo
    – Local loopback
    – Remote Loopback
• Multi-function programmable 16-bit counter/timer
• Single interrupt output with seven maskable interrupting conditions
• On-chip crystal oscillator
• Low power mode
• TTL compatible
• Single +5V power supply
• Commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature versions available
• SOL, PLCC and 300 mil wide DIP packages available