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SC26C92A1B

Dual universal asynchronous receiver/transmitter (DUART)

Philips Electronics 

Philips Semiconductors

Dual universal asynchronous receiver/transmitter (DUART)

Product specification

SC26C92

DESCRIPTION

The SC26C92 is a pin and function replacement for the SCC2692

and SCN2681 with added features and deeper FIFOs. Its

configuration on power up is that of the 2692. Its differences from

the 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, programmable

receiver and transmitter interrupts. (The SCC2692 is not being

discontinued.)

The Philips Semiconductors SC26C92 Dual Universal

Asynchronous Receiver/Transmitter (DUART) 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 and provides modem and DMA interface.

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 27 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 and transmitter is buffered by eight character FIFOs

to minimize the potential of receiver overrun, transmitter underrun

and to reduce interrupt overhead in interrupt driven systems. In

addition, a flow control capability is provided via RTS/CTS signaling

to disable a remote transmitter when the receiver buffer is full.

Also provided on the SC26C92 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 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).

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 transmitter

selectable from:

– 27 fixed rates: 50 to 230.4k baud

– Other baud rates to 230.4k baud at 16X

– Programmable user-defined rates derived from a

programmable 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 interrupting

conditions

– Output port can be configured to provide a total of up to six

separate 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

ORDERING INFORMATION

DESCRIPTION

40-Pin Plastic Dual In-Line Package (DIP)

44-Pin Plastic Leaded Chip Carrier (PLCC)

44–Pin Plastic Quad Flat Pack (PQFP)

COMMERCIAL1

VCC = +5V ±10%, TA = 0 to +70°C

SC26C92C1N

SC26C92C1A

SC26C92C1B

INDUSTRIAL

VCC = +5V ±10%, TA = -40 to +85°C

SC26C92A1N

SC26C92A1A

SC26C92A1B

DWG #

SOT129-1

SOT187-2

SOT307–2

2000 Jan 31

2

853–1585 23061

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