SSD1306Z datasheet(35/65 Pages) ETC2

35 / 65 page

SSD1306

Rev 1.1

P 35/59

Apr 2008

Solomon Systech

Horizontal addressing mode (A[1:0]=00b)

In horizontal addressing mode, after the display RAM is read/written, the column address pointer is increased

automatically by 1. If the column address pointer reaches column end address, the column address pointer is

reset to column start address and page address pointer is increased by 1. The sequence of movement of the

page and column address point for horizontal addressing mode is shown in Figure 10-3. When both column

and page address pointers reach the end address, the pointers are reset to column start address and page start

address (Dotted line in Figure 10-3.)

Figure 10-3 : Address Pointer Movement of Horizontal addressing mode

COL0

COL 1

…..

COL 126 COL 127

PAGE0

PAGE1

PAGE6

PAGE7

Vertical addressing mode: (A[1:0]=01b)

In vertical addressing mode, after the display RAM is read/written, the page address pointer is increased

automatically by 1. If the page address pointer reaches the page end address, the page address pointer is reset

to page start address and column address pointer is increased by 1. The sequence of movement of the page

and column address point for vertical addressing mode is shown in Figure 10-4. When both column and page

address pointers reach the end address, the pointers are reset to column start address and page start address

(Dotted line in Figure 10-4.)

Figure 10-4 : Address Pointer Movement of Vertical addressing mode

COL0

COL 1

…..

COL 126 COL 127

PAGE0

…..

PAGE1

…..

PAGE6

…..

PAGE7

…..

In normal display data RAM read or write and horizontal / vertical addressing mode, the following steps are

required to define the RAM access pointer location:

• Set the column start and end address of the target display location by command 21h.

• Set the page start and end address of the target display location by command 22h.

Example is shown in Figure 10-5.

10.1.4 Set Column Address (21h)

This triple byte command specifies column start address and end address of the display data RAM. This

command also sets the column address pointer to column start address. This pointer is used to define the

current read/write column address in graphic display data RAM. If horizontal address increment mode is

enabled by command 20h, after finishing read/write one column data, it is incremented automatically to the

next column address. Whenever the column address pointer finishes accessing the end column address, it is

reset back to start column address and the row address is incremented to the next row.

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