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