SSD1811 データシートの表示（PDF） - Solomon Systech

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SSD1811

LCD Segment / Common Driver with Controller

Solomon Systech  

COMMAND DESCRIPTIONS

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 in-

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

Set Higher Column Address

This command specifies the higher nibble of the 8-bit col-

umn address of the display data RAM. The column address will

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

Set Internal Regulator Resistors Ratio

This command is to enable any one of the eight internal re-

sistor sets for different regulator gain when using internal regu-

lator resistor network (IRS pin pulled high). In other words, this

command is used to select which contrast curve from the eight

possible selections. Please refer to Functional Block Descrip-

tions section for detail calculation of the LCD driving voltage.

Set Power Control Register

This command turns on/off the various power circuits asso-

ciated with the chip. There are three power relating sub-circuits

could be turned on/off by this command.

Internal voltage booster is used to generated the large neg-

ative voltage supply (VEE) from the voltage input (VSS1 - VDD).

An external negative power supply is required if this option is

turned off.

Internal regulator is used to generate the LCD driving volt-

age. VL6, from the negative power supply, VEE.

Output op-amp buffer is the internal divider for dividing the

different voltage levels (VL2, VL3, VL4, VL5) from the internal reg-

ulator output, VL6. External voltage sources should be fed into

this driver if this circuit is turned off.

Set Display Start Line

This command is to set Display Start Line register to deter-

mine starting address of display RAM to be displayed by select-

ing 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 and so on. Display start line values of 0 to 63

are assigned to Page 0 to 7.

Please refer to Figure 8 on page 15 as an example for dis-

play start line set to 56 (38h).

Set Contrast Control Register

This command adjusts the contrast of the LCD panel by

changing the LCD drive voltage, VL6, provided by the On-Chip

power circuits. V L6 is set with 64 steps (6-bit) in the contrast con-

trol register by a compound commands.

See Figure 10 for the contrast control flow.

Set Segment Re-map

This command changes the mapping between the display

data column addresses and segment drivers. It allows flexibility

in mechanical layout of LCD glass design. Please refer to Figure

8 on page 15 for example.

Set LCD Bias

This command is used to select a suitable bias ratio re-

quired for driving the particular LCD panel in use.

The selectable values of this command for SSD1811, for

SSD1812 are 1/8.4 or 1/6, SSD1813 are 1/6 or 1/5, and

SSD1815 are 1/9 or 1/7.

For other bias ratio settings, extended commands should be

used.

Set Entire Display On/Off

This command forces the entire display, including the icon

row, to be illuminated regardless of the contents of the GD-

DRAM. In addition, this command has higher priority than the

normal/reverse display.

This command is used together with “Set Display Display

ON/OFF” command to form a compound command for entering

power save mode. See “Set Power Save Mode” later in this sec-

tion.

Set Normal/Reverse Display

This command turns the display to be either normal or re-

versed. In normal display, a RAM data of 1 indicates an illumina-

tion on the corresponding pixel, while in reversed display, a RAM

data of 0 will turn on the pixel.

It should be noted that the icon line will not affect, that is not

be reversed, by this command.

Set Display On/Off

This command is used to turn the display on or off. When

display off is issued with entire display is on, power save mode

will be entered. See “Set Power Save Mode” later in this section

for details.

Set Page Address

This command enters the page address from 0 to 8 to the

RAM pager register for read/write operations. Please refer to

Figure 8 on page 15 for detail mapping.

Set COM Output Scan Direction

This command sets the scan direction of the COM output al-

lowing layout flexibility in LCD module assembly. See Figure 8

on page 15 for the relationship between turning on or off of this

feature.

In addition, the display will have immediate effect once this

command is issued. That is, if this command is sent during nor-

mal display, the graphic display will have vertical flipping effect.

Set Contrast Control Register

Contrast Level Data

No

Changes

Complete?

Yes

Figure 10 Contrast Control Flow

SOLOMON

Rev 3.1

08/2001

SSD181X Series

20

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