AS2574B datasheet(6/24 Pages) AMSCO

6 / 24 page

Data Sheet

AS2574B

Rev. 1

Jan. 1995

Symbol/command

MSB

LSB

HEX

000

004

002

010

014

012

008

Pause

Temporary MF select

Recall

LS on

LS off

MT on

MT off

2nd on

2nd off

Set Clock

Start

Start copy

Start FIFO

Start timer

Blank all

Test mode

Serial Interface

The AS2574B supports a serial bus. The protocol

defines device that sends data onto the bus as a

transmitter, and the receiving device as the receiver. The

AS2574B is controlling the transfer and hence the

master. The display driver, AS2590, being controlled is

the slave.

Clock and Data Conventions

Data states on the SDA line can change only during SCL

low. SDA state changes during SCL high are reserved

for indicating start and stop conditions (see figure 1).

StartCondition

All commands are preceded by the start condition, which

is a high to low transition of SDA when SCL is high.

StopCondition

All communications are terminated by a stop condition,

which is low to high transition of SDA when SCL is high.

START

BIT

SDA

SCL

BIT 0

BIT 1 …

… BIT 4

STOP BIT

WORD

GAP

Figure 1: Data Transmission

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