SC28C94 datasheet(4/38 Pages) PHILIPS

部件名	SC28C94

功能描述	Quad universal asynchronous receiver/transmitter QUART

PDF	38 Pages

Scroll/Zoom	100%

制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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4 / 38 page

Philips Semiconductors

Product specification

SC28C94

Quad universal asynchronous receiver/transmitter (QUART)

1998 Aug 19

BLOCK DIAGRAM

D0–D7

RDN

WRN

CEN

A0–A5

RESET

X1/CLK

BUS BUFFER

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

TIMING

CHANNEL A

MR 0, 1, 2

INPUT PORT

OUTPUT PORT

OPCR

CSR Rx

CSR Tx

CRYSTAL

OSCILLATOR

POWER UP-DOWN

LOGIC

SAME AS

DUART AB

8 BYTE TRANSMIT

FIFO

TRANSMIT SHIFT

8 BYTE

RECEIVE FIFO

RECEIVE SHIFT

CHANGE-OF-

STATE

DETECTORS (4)

IPCR

ACR

FUNCTION SELECT

LOGIC

CHANNEL B

(AS ABOVE)

TIMING

CLOCK

SELECTORS

COUNTER/

TIMER

ACR

CTUR

CTLR

INTERRUPT CONTROL

IMR

ISR

INTERNAL DATA

BUS

TxDA

RxDA

TxDB

RxDB

1:0

TIMING

CONTROL

DACKN

DUART CD

TXDC

TXDD

RXDC

RXDD

I/O[3:0]C

I/O[3:0]D

1:0

I/O[3:0]B

I/O[3:0]A

•VCC

•VSS1

•VSS2

•VSS3

•VSS4

BAUD RATE

GENERATOR

DUART AB

LOGIC

GLOBAL

REGISTERS

IRQN

IACKN

INTERRUPT ARBITRATION

DUART

COMMON

÷ 2

SD00160

Figure 3. Block Diagram

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