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2681 / SCN2681AC1A44 / SCN2681A / duart
2681 / SCN2681AC1A44 / SCN2681A / duart
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Dual asynchronous receiver/transmitter (DUART)
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. 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.
Each receiver is quadruply 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 buffer of the receiving device is full.
Also provided on the SCN2681 are a multipurpose 7-bit input port and a multipurpose 8-bit output port. These can be used as generalbpurpose I/O ports or can be assigned specific functions (such as clock inputs or status/interrupt outputs) under program control.
Dual full-duplex asynchronous receiver/transmitter
Quadruple buffered receiver data registers
Odd, even, no parity or force parity
1, 1.5 or 2 stop bits programmable in 1/16-bit increments
Programmable baud rate for each receiver and transmitter selectable from:
22 fixed rates: 50 to 115.2k baud
16-bit programmable Counter/Timer
One user-defined rate derived from programmable timer/counter
Parity, framing, and overrun error detection
Line break detection and generation
Multi-function programmable 16-bit counter/timer
Multi-function 7-bit input port
Can serve as clock or control inputs
Change of state detection on four inputs
100kW typical pull-up resistor
Multi-function 8-bit output port
Individual bit set/reset capability
Outputs can be programmed to be status/interrupt signals
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: 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
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