January 1995

4

Philips Semiconductors

Product specification

Transceiver for serial data communication

HEF4755V

LSI

Table 1

Input code for message length

Table 2

Input code for input mode

Table 3

Permissible time tolerance in bit distortion

Notes

1. H = HIGH state (the most positive voltage)

2. L = LOW state (the least positive voltage)

ML0

ML1

MESSAGE LENGTH

H

H

6 data bytes

L

H

4 data bytes

H

L

2 data bytes

LL

variable length

depends on

format byte

RX

TX

AS

L

L

L

status register connected to the data bus for error recognition

H

L

L

receiving in synchronous mode

L

H

L

transmitting in synchronous mode

H

H

L

receiving messages (without redundancy bit); data parallel out;

calculating of redundancy byte; transmitting data with redundancy

byte in synchronous mode

L

L

H

only bit check in asynchronous mode; no data output on data bus

H

L

H

receiving in asynchronous mode

L

H

H

transmitting in asynchronous mode

H

H

H

receiving and transmitting of a regenerated message in the

asynchronous mode

TT1

TT0

PERMITTED DISTORTION (dt/T)

L

L

6/32

≈ 19%

L

H

8/32 = 25%

H

L

10/32

≈ 31%

H

H

12/32

≈ 37%