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Serial Interface (3-wire)

The 3-wire serial interface consists of Serial Clock (SCLK), Serial Data In (SDIN), and Chip Select (/CS).

D0 acts as SCLK and D1 acts as SDIN. D2 must be left as a No Connect.

D3~D7, E, R/W, and D/C should be connected to Ground.

Function

/RD

/WR

/CS

D/C

D0

Write Command

Tie LOW

Tie LOW

0

Tie LOW

↑

Write Data

Tie LOW

Tie LOW

0

Tie LOW

↑

SDIN is shifted into an 9-bit shift register on every rising edge of SCLK in the order of D/C, D7, D6,…D0.

D/C (first bit of the sequential data) will determine if the following data byte is written to the Display Data

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

Note: Read functionality is not available in serial mode.

For detailed timing information for each interface mode, view full SSD1322 datasheet here (pages 50-54):

http://www.newhavendisplay.com/app_notes/SSD1322.pdf

Recommended Initialization

//pull /RES (pin #16) low

//keep /RES low for minimum 200µs

//pull /RES high

//wait minimum 200µs before sending commands

//display OFF

//set CLK div. & OSC freq.

//set MUX ratio

//set offset

//function selection

//set re-map

//master contrast current

//set contrast current

//set phase length

//set pre-charge voltage

//set VSL

//set VCOMH

//set display mode

//display ON

}