SC28C94A1A(1998) データシートの表示（PDF） - Philips Electronics

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SC28C94A1A
(Rev.:1998)

Quad universal asynchronous receiver/transmitter (QUART)

Philips Electronics 

Philips Semiconductors

Quad universal asynchronous receiver/transmitter (QUART)

Product specification

SC28C94

BLOCK DIAGRAM

8

D0–D7

RDN

WRN

CEN

6

A0–A5

RESET

DACKN

÷2

X1/CLK

X2

TXDC

TXDD

RXDC

RXDD

I/O[3:0]C

4

I/O[3:0]D

4

IACKN

IRQN

•VCC

•VSS1

•VSS2

•VSS3

•VSS4

BUS BUFFER

TIMING

CONTROL

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

INTERNAL DATA

BUS 8

TIMING

CRYSTAL

OSCILLATOR

POWER UP-DOWN

LOGIC

18

BAUD RATE

GENERATOR

DUART CD

SAME AS

DUART AB

INTERRUPT ARBITRATION

LOGIC

GLOBAL

REGISTERS

INTERRUPT CONTROL

IMR

ISR

DUART AB

CHANNEL A

8 BYTE TRANSMIT

FIFO

TRANSMIT SHIFT

REGISTER

8 BYTE

RECEIVE FIFO

RECEIVE SHIFT

REGISTER

MR 0, 1, 2

CR

SR

CSR Rx

CSR Tx

CHANNEL B

(AS ABOVE)

INPUT PORT

CHANGE-OF-

STATE

DETECTORS (4)

IPCR

ACR

OUTPUT PORT

FUNCTION SELECT

LOGIC

OPCR

TIMING

CLOCK

SELECTORS

COUNTER/

TIMER

ACR

CTUR

CTLR

Figure 3. Block Diagram

TxDA

RxDA

TxDB

RxDB

DUART

COMMON

AB

1:0 1:0

4

4

I/O[3:0]B

I/O[3:0]A

SD00160

1998 Aug 19

4

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