28L202A1B Ver la hoja de datos (PDF) - Philips Electronics

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28L202A1B

Dual universal asynchronous receiver/transmitter (DUART)

Philips Electronics 

Philips Semiconductors

Dual universal asynchronous receiver/transmitter

(DUART)

Objective specification

SC28L202

8

D0–D7

BUS BUFFER

RDN

WRN

CEN

4

A0–A5

RESET

I/M

INTRN

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

INTERRUPT CONTROL

IMR

ISR

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

MRA1, 2

CRA

SRA

CHANNEL B

(AS ABOVE)

I/O PORT A

CHANGE OF

STATE

DETECTORS (4)

IPCR

ACR

TxDA

RxDA

TxDB

RxDB

8

I/O7:0A

I/O PORT B

FUNCTION

SELECT LOGIC

OPCR

OPR

8

I/O7:0B

FIFO

CONTROL

1998 Oct 05

FIFO

RAM

Figure 1. Block Diagram

7

VCC

GND

SD00679

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