ST8012 datasheet(21/47 Pages) SITRONIX

21 / 47 page

ST8012

V1.6

21/47

2004/09/08

DESCRIPTION FUNCTIONS

The MPU Interface

Selecting the Interface Type

With the ST8012 chips, data transfers are done through

an 4-bit parallel data bus (D3 to D0) or through a serial

data input (SI). Through selecting the P/S terminal

polarity to the “H” or “L” it is possible to select either

parallel data input or serial data input as shown in Table

Table 1

P/S

D3~D1

H: Parallel Input

D3~D1

L: Serial Input

VDD

Command Serial Interface

With the ST8012 chips, command data transfers are

done through a serial data input. And it’s timing show in

Figure1.

Figure1

SCLK

XCS

SID

rite command timing diagram

ps :when don’t use the command must set XCS to height level.

The Power Supply Circuits (use serial interface)

The power supply circuits are low-power consumption

power supply circuits that generate the voltage levels

required for the LCD drivers. They are Booster circuits,

voltage regulator circuits, and voltage follower circuits.

They are only enabled in master operation, when the

mode is in common mode or common/segment mode.

The power supply circuits can turn the Booster circuits,

the voltage regulator circuits, and the voltage follower

circuits ON or OFF independently through the use of

the Power Control Set command. Consequently, it is

possible to make an external power supply and the

internal power supply function somewhat in parallel.

Table 3 shows the Power Control Set Command 3-bit

data control function, and Table 4 shows reference

combinations.

Table3

bit

Function

Status

“111”

“000”

Booster circuit control bit

OFF

The Control Details of Each Bit of the Power Control Set Command

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