UM2681 판매점 - Dual Asynchronous Receiver/Transmitter

UM2681 반도체 회로 부품 판매점

Dual Asynchronous Receiver/Transmitter

UMC

(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

INTRN

WRN

RON

RXOB

TXOB

OPl

GNO

VCC

IP2

CEN

RESET

Xl/CLK

RXOA

TXOA

OPO

INTRN

WRN

RON

RXOB

TXOB

GNO

7-18

Vcc

CEN

RESET

Kl/CLK

RXOA

TXOA

INTRN

(DUMC

Also provided on the UM2681 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

Absolute Maximum Ratings*

Operating ambient temperature .......... 0° to +70°C

Storage temperature .. . . . . . . . . . . .. _65° to +1500 C

All voltages with respect to ground .... -O.5V to +6.0V

UM2681 SERIES

outputs) under program control.

The UM2681 is available in three package versions to

satisfy various system requirements.

*Comments

Stress above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device.

These are stress ratings only. Functional operation of

this device at these or any other conditions above those

indicated in the operational sections of this specification

is not implied and exposure to absolute maximum rating

conditions for extended period~ may affect device

reliability.

Block Diagram

Do·D7 _______BUS BUFFER __P=

RDN -

OPERATION CONTROL

I IWRN - _

ADDRESS

CEN

. DECODE

I IAO-A3--}--

RESET _

RIW CONTROL

INTRN-

INTERRUPT

CONTROL

IMR

ISR

.. v

t---

CHANNEL A

, TRANSMIT

HOLDING REG

TRANSMIT

SHIFT REGISTER

r------ TxDA

RECEIVE

HOLDING REG

(3)

RECEIVE

SHIFT REG

I rMRA 1,2

I CRA I

I SRA I

~RxDA

CHANNEL B

(AS ABOVE)

TxDB

RxDB

INPUT PORT

X1/CLK_

X2--

TIMING

I BAUD RATE

GENERATOR

I ICLOCK

SELECTORS

ICOUNTERfTlMER I

I XTALOSC I

CHANGE OF

i...J',,----./.

~~ 1--_ __.1

STATE

DETECTORS (4)

:II-~----'..IP_C_R_-I1

I--¥-- IPO-IP6

~ L-~.~A~C=R~='__j

OUTPUT PORT

FUNCTION

SELECT

LOGIC

~-T--- OPO-OP7

I OPCR

. OPR

CSRA

CSRB

ACR

CTUR

CTLR

.---VCC

.---GND

7-19

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제조업체: UMC

( umc )

UM2681 receiver

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일반적인 전자부품 판매점

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UM2681 반도체 회로 부품 판매점

Dual Asynchronous Receiver/Transmitter

국내 전력반도체 판매점

일반적인 전자부품 판매점

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