SCC2692AC1A44

双重异步接收器/发送器DUART Dual asynchronous receiver/transmitter DUART

The is a 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. 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.

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Quadruple buffered receiver data register

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16-bit Programmable counter/timer

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Parity, framing and overrun error detection

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False start bit detection

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Multi-function 7-bit input port

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Automatic wake-up mode for multidrop applications

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Start-end break interrupt/status

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Detects break which originates in the middle of a character

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On-chip crystal oscillator

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On-chip crystal oscillator

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Power down mode

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Receiver timeout mode

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Commercial and industrial temperature range versions

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TTL compatible