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SCC68681

Dual asynchronous receiver/transmitter (DUART)

NXP Semiconductors. 

Philips Semiconductors

Dual asynchronous receiver/transmitter (DUART)

Product data

SCC68681

BLOCK DIAGRAM

8

D0–D7

BUS BUFFER

R/WN

DTACKN

CSN

4

A1–A4

RESETN

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

INTRN

IACKN

INTERRUPT CONTROL

IMR

ISR

IVR

X1/CLK

X2

TIMING

BAUD RATE

GENERATOR

CLOCK

SELECTORS

COUNTER/

TIMER

XTAL OSC

CSRA

CSRB

ACR

CTLUR

CTLR

CHANNEL A

TRANSMIT

HOLDING REG

TRANSMIT

SHIFT REGISTER

RECEIVE

HOLDING REG (3)

RECEIVE

SHIFT REGISTER

MR1, 2

CRA

SRA

CHANNEL B

(AS ABOVE)

INPUT PORT

CHANGE OF

STATE

DETECTORS (4)

IPCR

ACR

OUTPUT PORT

FUNCTION

SELECT LOGIC

OPCR

OPR

Figure 2. Block Diagram

TxDA

RxDA

TxDB

RxDB

6

IP0-IP5

8

OP0-OP7

VCC

GND

SD00108

2004 Apr 06

5

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