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SCC2681 Datasheet(PDF) 2 Page - NXP Semiconductors |
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SCC2681 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 29 page  Philips Semiconductors Product data SCC2681 Dual asynchronous receiver/transmitter (DUART) 2 2004 Apr 06 DESCRIPTION The Philips Semiconductors SCC2681 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. It is manufactured in a CMOS process. 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 16 × clock derived from a programmable counter/timer, or an external 1 × or 16× 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 SCC2681 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. The SCC2681 is available in three package versions: 40-pin and 28-pin DIPs (both 0.6” wide); and a 44-pin PLCC. FEATURES • Dual full-duplex asynchronous receiver/transmitter • Quadruple buffered receiver data registers • 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 • Programmable baud rate for each receiver and transmitter selectable from: – 22 fixed rates: 50 to 115.2 k baud • 16-bit programmable Counter/Timer – Non-standard rates to 115.2 kb – One user-defined rate derived from programmable timer/counter – External 1 × or 16× 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 • 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 – 100 k Ω typical pull-up resistor • Multi-function 8-bit output port – Individual bit set/reset capability – Outputs can be programmed to be status/interrupt signals – DMA signals – Auto 485 turn-around • 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: 1× – 1 MB/sec; 16× – 125 kB/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 • Single +5 V power supply • Commercial and industrial temperature ranges available • DIP and PLCC packages ORDERING INFORMATION Type number Package Name Description Version Commercial; VCC = +5 V ± 5%; Tamb = 0 °C to +70 °C SCC2681AC1A44 PLCC44 plastic leaded chip carrier; 44 leads SOT187-2 SCC2681AC1N28 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 SCC2681AC1N40 DIP40 plastic dual in-line package; 40 leads (600 mil) SOT129-1 Industrial; VCC = +5 V ± 10%; Tamb = –40 °C to +85 °C SCC2681AE1A44 PLCC44 plastic leaded chip carrier; 44 leads SOT187-2 SCC2681AE1N28 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1 SCC2681AE1N40 DIP40 plastic dual in-line package; 40 leads (600 mil) SOT129-1 |
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