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What is UM2681?

This electronic component, produced by the manufacturer "UMC", performs the same function as "Dual Asynchronous Receiver/Transmitter".


UM2681 Datasheet PDF - UMC

Part Number UM2681
Description Dual Asynchronous Receiver/Transmitter
Manufacturers UMC 
Logo UMC Logo 


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(l)UMC
,===========Dual UM2681 SERIES
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Features
• Dual full-duplex asynchronous receiver/transmitter
• Ouadruple 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
transmiter' selectable from:
18 fixed rates: 50 to 38.4K baud
One user defined rate derived from programmable
timer/counter
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
Localloopback
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
• 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 inter-
rupting conditions
Output port can be configured to provide a total of
up to six separate wire-OR'able interrupt outputs
• Maximum data transfer: 1X-l MB/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
• TTL compatible
• Single +5V power supply
General Description
The UM2681 Dual Universal Asynchronous Receiver/
Transmitter (DUART) is a single chip NMOS-LSI com-
munications 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.
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
Pin Configuration
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 overrun or to reduce interrupt over-
head 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.
OP2
OP4
OP6
DO
02
04
06
INTRN
AO
Al
A2
A3
WRN
RON
RXOB
TXOB
OPl
01
03
05
07
GNO
VCC
IP2
CEN
RESET
X2
Xl/CLK
RXOA
TXOA
OPO
DO
02
04
D6
INTRN
Al
A2
A3
WRN
RON
RXOB
TXOB
01
03
05
07
GNO
7-18
AO
Vcc
CEN
RESET
Kl/CLK
RXOA
TXOA
DO
02
04
06
INTRN

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UM2681 equivalent
RESET
AO-A3
CEN
RON
00-07
(READ)
WRN
00-07
(WRITE)
RON
IPO-IP6
WRN
OPO-OP7
RON
OR
WRN
INTRN
OR
OP3-0P7
UM2681 SERIES
-}---
Fi~ure 1. Reset Timing
.1
FLOAT
1__- - - - t RWO - - - -...1
Figure 2. Bus Timing
Figure 3. Port Timing
\'---"---~_tIRj_
Figure 4. Interrupt Timing
7-22


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UM2681 electronic component.


Information Total 23 Pages
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