SCN2681T

The Philips Semiconductors SCN2681 Dual Universal Asynchronous Receiver/Transmitter (DUART) is a single-chip MOS-LSI communications device that provides two independent full-duplex asynchronous receiver/transmitter channels in a single package. The SCN2681T features a faster bus cycle time than the standard SCN2681.  The quick bus cycle eliminates or reduces the need for wait states with fast CPUs and permits high throughput in I/O intensive systems.  Higher external clock rates may be used with the transmitter, receiver and counter timer which in turn provide greater versatility in baud rate generation.  The SCN2681T interfaces directly with microprocessors and may be used in a polled or interrupt driven system.

The operating mode and data format of each channel can be programmed independently.  Additionally, each receiver and transmitter can select its operating speed as one of eighteen fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock.  The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs.  The ability to independently program the operating speed of the receiver and transmitter make the DUART particularly attractive for dual-speed channel applications such as clustered terminal systems.

Each receiver is quadruple buffered to minimize the potential of receiver over-run or to reduce interrupt overhead in interrupt driven systems.  In addition, a flow control capability is provided to disable a remote DUART transmitter when the receiver buffer is full.

Also provided on the SCN2681T are a multipurpose 7-bit input port and a multipurpose 8-bit output port.  These can be used as general purpose I/O ports or can be assigned specific functions (such as clock inputs or status/interrupt outputs) under program control.

For a complete functional description and programming information for the SCN2681T, refer to the SCN2681 product specification.