ST7528 Sitronix, ST7528 Datasheet - Page 22

• Manufacturer Part Number: ST7528
• Description: 16 Gray Scale Dot Matrix LCD Controller
• Manufacturer: Sitronix

ST7528
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
3-Line SPI mode
4-Line SPI mode
IIC SPI mode
If A0 is not used it must be fixed either “H” or “L”
4-Line SPI Mode (PS0 = "L", PS1 = "H" , PS2 = "L")
Ver2.3
SCL
A0
/CB
SI
PS0
L
L
L
DB7
PS1
L
H
L
Figure 1 4-line SPI Timing
DB6
DB5
DB4
PS2
L
L
H
22/97
DB3
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DB2
CSB
CSB
CSB
CSB
DB1
DB0
DB7
DB6
A0
No used
Used
No Used
2007/1/3
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