SCC2692 Datasheet, PDF (2/30 Pages) NXP Semiconductors – Dual asynchronous receiver/transmitter DUART

Philips Semiconductors
Dual asynchronous receiver/transmitter (DUART)
Product specification
SCC2692
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.
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.
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.
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.
FEATURES
• Dual full-duplex asynchronous receiver/transmitters
• Quadruple buffered receiver data register
• 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:
– 22 fixed rates: 50 to 115.2k baud
– Non-standard rates to 115.2Kb
– Non-standard user-defined rate derived from 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 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
• 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 rates: 1X – 1MB/sec, 16X – 125kB/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
• Commercial and industrial temperature range versions
• TTL compatible
• Single +5V power supply
ORDERING INFORMATION
DESCRIPTION
40-Pin Plastic Dual In-Line Package (DIP)¹
28-Pin Plastic Dual In-Line Package (DIP)¹
44-Pin Plastic Leaded Chip Carrier (PLCC) Package
44–Pin Plastic Quad Flat Pack (PQFP)
NOTE:
1. For availability, please contact factory.
COMMERCIAL
V_CC = +5V +10%,
T_A = 0 to +70°C
SCC2692AC1N40
SCC2692AC1N28
SCC2692AC1A44
SCC2692AC1B44
INDUSTRIAL
V_CC = +5V +10%,
T_A = -40 to +85°C
SCC2692AE1N40
SCC2692AE1N28
SCC2692AE1A44
SCC2692AE1B44
DWG #
SOT129-1
SOT117-1
SOT187-2
SOT307–2
1998 Sep 04
2
853–0895 19971