SC26C92C1B,551

SC26C92C1B,551 Product specification

SC26C92C1B,551 FEATURES

• Dual full-duplex independent asynchronous receiver/transmitters
• 8 character FIFOs for each receiver and transmitter
• 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
• 16-bit programmable Counter/Timer
• Programmable baud rate for each receiver and transmitterselectable from:– 27 fixed rates: 50 to 230.4k baud– Other baud rates to 230.4k baud at 16X– Programmable user-defined rates derived from aprogrammable counter/timer– External 1X or 16X 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– Multidrop mode (also called ‘wake-up’ or ‘9-bit’)
• Multi-function 7-bit input port– Can serve as clock, modem, or control inputs– Change of state detection on four inputs– Inputs have typically >100k pull-up resistors
• Multi-function 8-bit output port– Individual bit set/reset capability– Outputs can be programmed to be status/interrupt signals– FIFO states for DMA and modem interface
• Versatile interrupt system– Single interrupt output with eight maskable interruptingconditions– Output port can be configured to provide a total of up to sixseparate wire-ORable interrupt outputs– Each FIFO can be programmed for four different interrupt levels– Watch dog timer for each receiver
• Maximum data transfer rates:1X – 1Mb/sec, 16X – 1Mb/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
• Power down mode
• Receiver timeout mode
• Single +5V power supply
• Powers up to emulate SCC2692

SC26C92C1B,551 DESCRIPTION

The SC26C92 is a pin and function replacement for the SCC2692and SCN2681 with added features and deeper FIFOs. Itsconfiguration on power up is that of the 2692. Its differences fromthe 2692 are: 8 character receiver, 8 character transmit FIFOs,watch dog timer for each receiver, mode register 0 is added,extended baud rate and overall faster speeds, programmablereceiver and transmitter interrupts. (The SCC2692 is not beingdiscontinued.)The Philips Semiconductors SC26C92 Dual UniversalAsynchronous Receiver/Transmitter (DUART) is a single-chipCMOS-LSI communications device that provides two full-duplexasynchronous receiver/transmitter channels in a single package. Itinterfaces directly with microprocessors and may be used in a polledor interrupt driven system and provides modem and DMA interface.The operating mode and data format of each channel can beprogrammed independently. Additionally, each receiver andtransmitter can select its operating speed as one of 27 fixed baudrates, a 16X clock derived from a programmable counter/timer, or anexternal 1X or 16X clock. The baud rate generator andcounter/timer can operate directly from a crystal or from externalclock inputs. The ability to independently program the operatingspeed of the receiver and transmitter make the DUART particularlyattractive for dual-speed channel applications such as clusteredterminal systems.Each receiver and transmitter is buffered by eight character FIFOsto minimize the potential of receiver overrun, transmitter underrunand to reduce interrupt overhead in interrupt driven systems. Inaddition, a flow control capability is provided via RTS/CTS signalingto disable a remote transmitter when the receiver buffer is full.Also provided on the SC26C92 are a multipurpose 7-bit input portand a multipurpose 8-bit output port. These can be used as generalpurpose I/O ports or can be assigned specific functions (such asclock inputs or status/interrupt outputs) under program control.The SC26C92 is available in three package versions: 40-pin 0.6”wide DIP, a 44-pin PLCC and 44–pin plastic quad flat pack (PQFP).

• Automatic wake-up mode for multidrop applications