ST8009 datasheet(21/43 Pages) SITRONIX

21 / 43 page

ST8009

V1.1

21/43

2006/11/1

10. HARDWARE CIRCUIT DESCRIPTION

The LCD Data Bus Interface

There are two kinds of interfaces for LCD data bus.

One is 4-bit parallel data interface and the other is the

serial interface. These two kinds of interfaces are

selected by setting the P/S bit in the “Interface Control

Selection” register, and see detail in the Table 1. D1~D3

on data bus must be fixed to ground when “1” for P/S bit

is selected.

Table 1

P/S

Data Bus Mode

Parallel Interface(D0~D3)

Serial Interface (D0)

The Command Registers Setting Interface

The command registers for ST8009 is setting by serial

interface, SCLK and SID. The timing of serial interface

is shown in Fig.1 and Fig.2 Both SCLK and SID must

be connected to pull-up resistors.

START AND STOP CONDITIONS

Both SID and SCLK must be kept at high when the bus

is not busy, and if SCLK is high at the falling edge of

SID, ST8009 will enter the “Start Condition” for

beginning to receive command. Otherwise, if SCLK is

high at the rising edge of SID, ST8009 will enter the

“Stop Condition” for finishing command transfer. The

start and stop conditions are illustrated in Fig.3

SCLK

SID

Fig .1 Write command timing diagram

SDI

SCLK

data line

stable;

data valid

change

of data

allowed

Fig .2 Bit transfer

SDI

SCLK

START con dition

STOP con dition

Fig .3 Definition of START and STOP conditions

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