XR88C681

XR88C681 CMOS Dual Channel UART (DUART) FEATURES D Two Full Duplex, Independent Channels D Asynchronous Receiver and Transmitter D Quadruple-Buffered Receivers and Dual Buffered Transmitters D Programmable Stop Bits in 1/16 Bit Increments D Internal Bit Rate Generators with More than 23 Bit Rates D Independent Bit Rate Selection for Each Transmitter and Receiver D External Clock Capability D Maximum Bit Rate: 1X Clock - 1Mb/s, 16X Clock - 125kb/s D Normal, AUTOECHO, Local LOOPBACK and Remote LOOPBACK Modes D Multi-function 16 Bit Counter/Timer D Interrupt Output with Eight Maskable Interrupt Conditions D Interrupt Vector Output on Acknowledge (40 Pin DIP and 44 Pin PLCC Packages Only) June 2006 D Programmable Interrupt Daisy Chain D 8 General Purpose Outputs (40 Pin DIP and 44 Pin PLCC Packages Only) D 7 General Purpose Inputs with Change of States Detectors on Inputs (40 Pin DIP and 44 Pin PLCC Packages Only) D Multi-Drop Mode Compatible with 8051 Nine Bit Mode D On-Chip Oscillator for Crystal D Standby Mode to Reduce Operating Power D Compatible with the Motorola MC2681 and Signetics SCC2692 devices D Advanced CMOS Low Power Technology APPLICATIONS D Multimedia Systems D Serial to Parallel/Parallel to Serial Converter D DTE for Modem Communication Systems GENERAL DESCRIPTION The EXAR Dual Universal Asynchronous Receiver and Transmitter (DUART) is a data communications device that provides two fully independent full duplex asynchronous communication channels in a single p...