Philips Semiconductors
Product specification
Dual asynchronous receiver/transmitter (DUART)
SCC2692
– Non-standard user-defined rate derived from programmable
counter/timer
DESCRIPTION
The Philips Semiconductors SCC2692 Dual Universal
Asynchronous Receiver/Transmitter (DUART) which is compatible
with the SCN2681. It 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.
– 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)
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.
– 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 or control inputs
– Change of state detection on four inputs
– Inputs have typically >100k pull-up resistors
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 receiver buffer is full.
• Multi-function 8-bit output port
– Individual bit set/reset capability
– Outputs can be programmed to be status/interrupt signals
Also provided on the SCC2692 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.
• 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
FEATURES
• Maximum data transfer rates: 1X – 1MB/sec, 16X – 125kB/sec
• Automatic wake-up mode for multidrop applications
• Start-end break interrupt/status
• Dual full-duplex asynchronous receiver/transmitters
• Quadruple buffered receiver data register
• Programmable data format
– 5 to 8 data bits plus parity
• Detects break which originates in the middle of a character
• 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
• Programmable baud rate for each receiver and transmitter
selectable from:
• Commercial and industrial temperature range versions
• TTL compatible
– 22 fixed rates: 50 to 115.2k baud
– Non-standard rates to 115.2Kb
• Single +5V power supply
ORDERING INFORMATION
COMMERCIAL
INDUSTRIAL
V = +5V +10%,
CC
DESCRIPTION
DWG #
V
CC
= +5V +10%,
T
A
= 0 to +70°C
T = -40 to +85°C
A
1
40-Pin Plastic Dual In-Line Package (DIP)
SCC2692AC1N40
SCC2692AC1N28
SCC2692AC1A44
SCC2692AC1B44
SCC2692AE1N40
SCC2692AE1N28
SCC2692AE1A44
SCC2692AE1B44
SOT129-1
SOT117-1
SOT187-2
SOT307–2
1
28-Pin Plastic Dual In-Line Package (DIP)
44-Pin Plastic Leaded Chip Carrier (PLCC) Package
44–Pin Plastic Quad Flat Pack (PQFP)
NOTE:
1. For availability, please contact factory.
2
1998 Sep 04
853–0895 19971
NXP [ NXP ]
