SSD1305Z datasheet(21/70 Pages) ETC1

21 / 70 page

SSD1305

Rev 1.9

P 21/70

May 2008

Solomon Systech

8.1.3

MCU Serial Interface

The serial interface consists of serial clock SCLK, serial data SDIN, D/C#, CS#. In SPI mode, D0 acts as

SCLK, D1 acts as SDIN. For the unused data pins, D2 should be left open. The pins from D3 to D7, E and

R/W# can be connected to an external ground.

Table 8-5 : Control pins of Serial interface

Function

E(RD#)

R/W#(WR#)

CS#

D/C#

Write command Tie LOW

Tie LOW

↑

Write data

Tie LOW

↑

Note

(1) ↑ stands for rising edge of signal

(2) H stands for HIGH in signal

(3) L stands for LOW in signal

SDIN is shifted into an 8-bit shift register on every rising edge of SCLK in the order of D7, D6, ... D0. D/C#

is sampled on every eighth clock and the data byte in the shift register is written to the Graphic Display Data

RAM (GDDRAM) or command register in the same clock.

Under serial mode, only write operations are allowed.

Figure 8-5 : Write procedure in SPI mode

8.1.4

MCU I

2C Interface

The I2C communication interface consists of slave address bit SA0, I2C-bus data signal SDA (SDAOUT/D2 for

output and SDAIN/D1 for input) and I

2C-bus clock signal SCL (D0). Both the data and clock signals must be

connected to pull-up resistors. RES# is used for the initialization of device.

a) Slave address bit (SA0)

SSD1305 has to recognize the slave address before transmitting or receiving any information by the

I2C-bus. The device will respond to the slave address following by the slave address bit (“SA0” bit)

and the read/write select bit (“R/W#” bit) with the following byte format,

b7 b6 b5 b4 b3 b2 b1

0 1 1 1 1 0 SA0 R/W#

“SA0” bit provides an extension bit for the slave address. Either “0111100” or “0111101”, can be

selected as the slave address of SSD1305. D/C# pin acts as SA0 for slave address selection.

“R/W#” bit is used to determine the operation mode of the I2C-bus interface. R/W#=1, it is in read

mode. R/W#=0, it is in write mode.

SCLK(D0)

SDIN(D1)

DB1

DB2

DBn

CS#

D/C#

SDIN/

SCLK

SSD1305Z Datasheet(PDF) 21 Page - List of Unclassifed Manufacturers

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