SSD1812 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

SSD1812

LCD Segment / Common Driver with Controller

Unspecified 

Command Description

Set Display On/Off

This command alternatively turns the display on and off. When display

off is issued with entire display on, power save mode will be entered. See

“Set Power Save Mode”for details.

Set Display Start Line

This command is to set Display Start Line register to determine

starting address of display RAM to be displayed by selecting a value

from 0 to 63. With value equals to 0, D0 of Page 0 is mapped to COM0.

With value equals to 1, D1 of Page0 is mapped to COM0. The display

start line values of 0 to 63 are assigned to Page 0 to 7.

Set Page Address

This command positions the page address to 0 to 8 possible positions

in GDDRAM. Refer to figure 5.

Set Higher Column Address

This command specifies the higher nibble of the 8-bit column address

of the display data RAM. The column address will be incremented by

each data access after it is pre-set by the MCU.

Set Lower Column Address

This command specifies the lower nibble of the 8-bit column address

of the display data RAM. The column address will be incremented by

each data access after it is pre-set by the MCU.

Set Segment Re-map

This commands changes the mapping between the display data col-

umn address and segment driver. It allows flexibility in layout during LCD

module assembly. Refer to figure 5.

Set Normal/Reverse Display

This command sets the display to be either normal/reverse. In nor-

mal display, a RAM data of 1 indicates an “ON”pixel while in reverse dis-

play, a RAM data of 0 indicates an “ON”pixel. In icon mode, the icon line

is not reversed by this command.

Set Entire Display On/Off

This command forces the entire display, including the icon row, to be

“ON”regardless of the contents of the display data RAM. This command

has priority over normal/reverse display. This command will be used with

“Set Display Display ON/OFF”command to form a compound command

for entering power save mode. See “Set Power Save Mode”.

Set LCD Bias

This command selects a suitable bias ratio (1/6 or 1/8) required for

driving the particular LCD panel in use. The POR default for SSD1812 is

set to 1/8 bias. For setting 1/4, 1/5, 1/7 and 1/9 bias, an extended com-

pound command should be used.

Set Read-Modify-Write Mode

This command puts the chip in read-modify-write mode in which:

1. the column address is saved before entering the mode

2. the column address is incremented by display data write but not by

display data read

Set End of Read-Modify-Write Mode

This command relieves the chip from read-modify-write mode. The

column address that is saved before entering read-modify-write mode

will be restored.

Software Reset

This command causes some of the internal status of the chip to be

initialized:

1. Display is OFF

3. Normal segment and display data column address mapping

(SEG0 mapped to address 00H)

4. Read-modify-write mode is OFF

5. Power control register is set at 0

6. Bias ratio is set at 1/8

7. Static indicator is OFF

8. Display start line is set at display RAM address 0

9. Column address counter is set at 0

10. Page address is set at 0

11. Normal scan direction of the COM outputs

12. Internal Regulator Resistor Ratio at 4

13. Contrast control register is set at 20H

14. Test mode is OFF

Set COM Output Scan Direction

This command sets the scan direction of the COM output allowing

layout flexibility in LCD module assembly.

Set Power Control Register

This command turns on/off the various power circuits associated

with the chip.

Set Internal Regulator Resistors Ratio

This command is to enable any one of the eight internal resistor

sets for different regulator gain when using internal regulator resistor

network (IRS pin pulled high). The relationship between the VL6 and

the 64 levels of contrast step is TBD.

0

-12V

Internal Contrast Registor

TBD

X2X1X0

Internal Regulator

Resistors Ratio Com-

mand:

00100X2X1X0

000

001

010

011

1 0 0 (POR)

101

110

111

Set Contrast Control Register

This commands adjusts the contrast of the LCD panel by changing

VL6 of the LCD drive voltage provided by the On-Chip power circuits.

VL6 is set with 64 steps (6-bit) contrast control register. It is a com-

pound commands:

Set Contrast Control Register

Contrast Level Data

No

Changes

Complete?

Yes

SOLOMON

REV 1.2 SSD1812

12/99

19

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