ST7528 datasheet(22/97 Pages) SITRONIX

22 / 97 page

ST7528

Ver2.3

22/97

2007/1/3

Serial Interface

3-Line / 4-Line (PS[2:0] = "000" or “010”)

When the ST7528 is active (CSB=”L”), serial data (DB7) and serial clock (DB6) inputs are enabled. And not active, the

internal 8-bit shift register and the 3-bit counter are reset. The display data/command indication may be controlled either via

software or the Register Select (A0) Pin, based on the setting of PS1. When the A0 pin is used (PS1 = “H”), data is display

data when A0 is high, and command data when A0 is low. When A0 is not used (PS1 =“L”), the LCD Driver will receive

command from MCU by default. If messages on the data pin are data rather than command, MCU should send Data

Direction command (11101000) to control the data direction and then one more command to define the number of data

bytes will be write. After these two continuous commands are sent, the following messages will be data rather than

command. Serial data can be read on the rising edge of serial clock going into DB6 and processed as 8-bit parallel data on

the eighth serial clock. And the DDRAM column address pointer will be increased by one automatically. The next bytes

after the display data string is handled as command data.

In 3-Line mode, default message from MCU is command, the 2 bytes command of Set Data Direction & Display Data

Length must be set before display data send from MCU, after the display data is sent over, the next message is turned to

be command.

Serial mode

PS0

PS1

PS2

CSB

3-Line SPI mode

CSB

No used

4-Line SPI mode

CSB

Used

IIC SPI mode

CSB

No Used

If A0 is not used it must be fixed either “H” or “L”

4-Line SPI Mode (PS0 = "L", PS1 = "H" , PS2 = "L")

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

DB7

DB6

/CB

SCL

Figure 1 4-line SPI Timing

ST7528 Datasheet(PDF) 22 Page - Sitronix Technology Co., Ltd.

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