SSD1309Z datasheet(13/57 Pages) SOLOMON

13 / 57 page

Solomon Systech

Jul 2011 P 18/62

Rev 1.1

SSD1309

Figure 8-5 : Write procedure in 4-wire Serial interface mode

8.1.4

MCU Serial Interface (3-wire SPI)

The 3-wire serial interface consists of serial clock SCLK, serial data SDIN and CS#.

In 3-wire 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, R/W# (WR#)#, E and D/C# can be connected to an external ground.

The operation is similar to 4-wire serial interface while D/C# pin is not used. There are altogether 9-bits will

be shifted into the shift register on every ninth clock in sequence: D/C# bit, D7 to D0 bit. The D/C# bit (first

bit of the sequential data) will determine the following data byte in the shift register is written to the Display

Data RAM (D/C# bit = 1) or the command register (D/C# bit = 0).

Under serial mode, only write operations are allowed.

Table 8-5 : Control pins of 3-wire Serial interface

Function

E(RD#)

R/W#(WR#)

CS#

D/C#

Write command

Tie LOW

↑

Write data

Tie LOW

↑

Note

(1) L stands for LOW in signal

(2) ↑ stands for rising edge of signal

Figure 8-6 : Write procedure in 3-wire Serial interface mode

SCLK

(D0)

SDIN(D1)

DB1

DB2

DBn

CS#

D/C#

SDIN/

SCLK

(D0)

SDIN(D1)

DB1

DB2

DBn

CS#

D/C#

SDIN/

SCLK

SSD1309Z Datasheet(PDF) 13 Page - Solomon Systech Limited

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