Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

SCC2681 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. SCC2681
Description  Dual asynchronous receiver/transmitter (DUART)
Download  29 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

SCC2681 Datasheet(HTML) 2 Page - NXP Semiconductors

 
Zoom Inzoom in Zoom Outzoom out
 2 / 29 page
background image
Philips Semiconductors
Product data
SCC2681
Dual asynchronous receiver/transmitter (DUART)
2
2004 Apr 06
DESCRIPTION
The Philips Semiconductors SCC2681 Dual Universal
Asynchronous Receiver/Transmitter (DUART) is a single-chip
MOS-LSI communications device that provides two independent
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. It is manufactured in a
CMOS process.
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 16
× clock derived from a programmable counter/timer,
or an external 1
× or 16× 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 buffer of the receiving device is
full.
Also provided on the SCC2681 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 SCC2681 is available in three package versions: 40-pin and
28-pin DIPs (both 0.6” wide); and a 44-pin PLCC.
FEATURES
Dual full-duplex asynchronous receiver/transmitter
Quadruple buffered receiver data registers
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
Programmable baud rate for each receiver and transmitter
selectable from:
– 22 fixed rates: 50 to 115.2 k baud
16-bit programmable Counter/Timer
– Non-standard rates to 115.2 kb
– One user-defined rate derived from programmable
timer/counter
– External 1
× or 16× 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
Multi-function programmable 16-bit counter/timer
Multi-function 7-bit input port
– Can serve as clock or control inputs
– Change of state detection on four inputs
– 100 k
Ω typical pull-up resistor
Multi-function 8-bit output port
– Individual bit set/reset capability
– Outputs can be programmed to be status/interrupt signals
– DMA signals
– Auto 485 turn-around
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: 1× – 1 MB/sec; 16× – 125 kB/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
Single +5 V power supply
Commercial and industrial temperature ranges available
DIP and PLCC packages
ORDERING INFORMATION
Type number
Package
Name
Description
Version
Commercial;
VCC = +5 V ± 5%; Tamb = 0 °C to +70 °C
SCC2681AC1A44
PLCC44
plastic leaded chip carrier; 44 leads
SOT187-2
SCC2681AC1N28
DIP28
plastic dual in-line package; 28 leads (600 mil)
SOT117-1
SCC2681AC1N40
DIP40
plastic dual in-line package; 40 leads (600 mil)
SOT129-1
Industrial;
VCC = +5 V ± 10%; Tamb = –40 °C to +85 °C
SCC2681AE1A44
PLCC44
plastic leaded chip carrier; 44 leads
SOT187-2
SCC2681AE1N28
DIP28
plastic dual in-line package; 28 leads (600 mil)
SOT117-1
SCC2681AE1N40
DIP40
plastic dual in-line package; 40 leads (600 mil)
SOT129-1


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn