INTEGRATED CIRCUITS SC26C92 Dual universal asynchronous receiver/transmitter (DUART) Product specification 2000 Jan 31 Supersedes data of 1998 Nov 09 IC19 Data Handbook Philips Semiconductors Product specification Dual universal asynchronous receiver/transmitter (DUART) SC26C92 DESCRIPTION Programmable baud rate for each receiver and transmitter The SC26C92 is a pin and function replacement for the SCC2692 selectable from: and SCN2681 with added features and deeper FIFOs. Its 27 fixed rates: 50 to 230.4k baud configuration on power up is that of the 2692. Its differences from Other baud rates to 230.4k baud at 16X the 2692 are: 8 character receiver, 8 character transmit FIFOs, Programmable user-defined rates derived from a watch dog timer for each receiver, mode register 0 is added, programmable counter/timer extended baud rate and overall faster speeds, programmable receiver and transmitter interrupts. (The SCC2692 is not being External 1X or 16X clock discontinued.) Parity, framing, and overrun error detection The Philips Semiconductors SC26C92 Dual Universal False start bit detection Asynchronous Receiver/Transmitter (DUART) is a single-chip CMOS-LSI communications device that provides two full-duplex Line break detection and generation asynchronous receiver/transmitter channels in a single package. It Programmable channel mode interfaces directly with microprocessors and may be used in a polled Normal (full-duplex) or interrupt driven system and provides modem and DMA interface. Automatic echo The operating mode and data format of each channel can be Local loopback programmed independently. Additionally, each receiver and transmitter can select its operating speed as one of 27 fixed baud Remote loopback rates, a 16X clock derived from a programmable counter/timer, or an Multidrop mode (also called wake-up or 9-bit) external 1X or 16X clock. The baud rate generator and Multi-function 7-bit input port counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating Can serve as clock, modem, or control inputs speed of the receiver and transmitter make the DUART particularly Change of state detection on four inputs attractive for dual-speed channel applications such as clustered Inputs have typically >100k pull-up resistors terminal systems. Multi-function 8-bit output port Each receiver and transmitter is buffered by eight character FIFOs Individual bit set/reset capability to minimize the potential of receiver overrun, transmitter underrun Outputs can be programmed to be status/interrupt signals and to reduce interrupt overhead in interrupt driven systems. In addition, a flow control capability is provided via RTS/CTS signaling FIFO states for DMA and modem interface to disable a remote transmitter when the receiver buffer is full. Versatile interrupt system Also provided on the SC26C92 are a multipurpose 7-bit input port Single interrupt output with eight maskable interrupting and a multipurpose 8-bit output port. These can be used as general conditions purpose I/O ports or can be assigned specific functions (such as Output port can be configured to provide a total of up to six clock inputs or status/interrupt outputs) under program control. separate wire-ORable interrupt outputs The SC26C92 is available in three package versions: 40-pin 0.6 Each FIFO can be programmed for four different interrupt levels wide DIP, a 44-pin PLCC and 44pin plastic quad flat pack (PQFP). Watch dog timer for each receiver Maximum data transfer rates: FEATURES 1X 1Mb/sec, 16X 1Mb/sec Dual full-duplex independent asynchronous receiver/transmitters Automatic wake-up mode for multidrop applications 8 character FIFOs for each receiver and transmitter Start-end break interrupt/status Programmable data format Detects break which originates in the middle of a character 5 to 8 data bits plus parity On-chip crystal oscillator Odd, even, no parity or force parity 1, 1.5 or 2 stop bits programmable in 1/16-bit increments Power down mode 16-bit programmable Counter/Timer Receiver timeout mode Single +5V power supply Powers up to emulate SCC2692 ORDERING INFORMATION 1 COMMERCIAL INDUSTRIAL DESCRIPTIONDESCRIPTION DWGDWG V = +5V 10%, T = 0 to +70C V = +5V 10%, T = -40 to +85C CC A CC A 40-Pin Plastic Dual In-Line Package (DIP) SC26C92C1N SC26C92A1N SOT129-1 44-Pin Plastic Leaded Chip Carrier (PLCC) SC26C92C1A SC26C92A1A SOT187-2 44Pin Plastic Quad Flat Pack (PQFP) SC26C92C1B SC26C92A1B SOT3072 2000 Jan 31 2 8531585 23061