MC141531 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC141531

LCD Segment / Common Driver CMOS

Motorola => Freescale 

Command Description

Set Display On/Off (Display Mode / Stand-by Mode)

The Display On command turns the LCD Common and Segment

outputs on and has no effect to the annunciator output. This com-

mand starts the conversion of data in GDDRAM to necessary wave-

forms on the Common and Segment driving outputs. The on-chip

bias generator is also turned on by this command. (Note: “Set Oscil-

lator On” command should be sent before “Set Display On”)

The Display Off command turn the display off and the states of the

LCD driver are as follow during display off:

1. The Common and Segment outputs are fixed at VLL1 (VSS).

2. The bias Internal DC/DC Converter is turned off.

3. The RAM and content of all registers are retained.

4. IC will accept new commands and data.

The status of the Annunciators and Oscillator are not affected by

this command.

Note: DON’T USE ICON DISPLAY MODE DURING DISPLAY

OFF.

Set GDDRAM Column Address

This command positions the address pointer on a column location.

The address can be set to location 00H-77H (120 columns). The col-

umn address will be increased automatically after a read or write

operation. Refer to “Address Increment Table” and command “Set

GDDRAM Page Address” for further information.

Set GDDRAM Page Address

This command positions the row address to 1 of 3 possible posi-

tions in GDDRAM. Refer to figure 5.

Master Clear GDDRAM

This command is to clear the content of page 1 and 2 of the Dis-

play Data RAM to zero. Issue this command followed by a dummy

write command.

Master Clear Icons

This command is used to clear the data in page 3 of GDDRAM

which stores the icon line data. Before using this command, set the

page address to Page 3 by the command “Set GDDRAM Page

Address”. A dummy write data is also needed after this “Master Clear

Icons” command to make the clear icon action effective.

Set Display Mode

This command switch the driver to full display mode or low power

icon mode. In low power icon mode, only icons (driven by COM16)

and annunciators are displayed, and the DC-DC converter, the Inter-

nal DC/DC Converter and the regulator are disabled. Do select 1/17

Mux ratio before using the low power icon mode.

Note: DON’T USE ICON DISPLAY MODE DURING DISPLAY OFF.

Set Multiplex Ratio

In normal display mode, the multiplex ratio could be set to be 1/16

or 1/17. For 1/16 Mux Ratio, COM16 signal should not be connected

to the panel.

Set Icon Mode A/B

In Icon mode A, on-pixels are stressed by a voltage with root-

mean-square value of 0.87xVDD, whereas off-pixels by 0.5xVDD. In

icon mode B, on-pixels are stressed by a voltage with root-mean-

square value of 0.71xVDD, whereas off-pixels by 0.41xVDD. This

command is used to control the contrast of the icon line (Com16)

under icon mode

Set Vertical Scroll Value

This command maps the selected GDDRAM row (00H-0FH) to

Com0. With scroll value equals to 0, Row 0 of GDDRAM is mapped

to Com0 and Row 1 through Row 15 are mapped to Com1 through

Com15 respectively. With scroll value equal to 1, Row 1 of

GDDRAM is mapped to Com0, then Row 2 through Row 15 will be

mapped to Com1 through Com14 respectively and Row 0 will be

mapped to Com15.

Save / Restore Column Address

With bit option = 1 in this command, the Save / Restore Column

Address command saves a copy of the Column Address of

GDDRAM. With a bit option = 0, this command restores the copy

obtained from the previous execution of saving column address. This

instruction is very useful for writing full graphics characters that are

larger than 8 pixels vertically.

Set Column Mapping

This instruction selects the mapping of GDDRAM to Segment driv-

ers for mechanical flexibility. There are 2 mappings to select:

1. Column 0 - Column 119 of GDDRAM mapped to Seg0-Seg119

respectively;

2. Column 0 - Column 119 of GDDRAM mapped to Seg119-Seg0

respectively.

Detail information please refer to section “Display Output Descrip-

tion”.

Set Row Mapping

This command selects the mapping of GDDRAM to Common Driv-

ers for mechanical flexibility. There are 2 mappings to select:

1. Row 0 - Row 15 of GDDRAM to Com0 - Com15 respectively;

2. Row 0 - Row 15 of GDDRAM to Com15 - Com0 respectively.

Output of Row 16 (Com16) will not be changed by this command.

See section “Display Output Description” for related information.

Set Annunciator Control Signals

This command is used to control the active states of the 3 stand

alone annunciator drivers.

Set Oscillator Enable / Disable

This command is used to either turn on or off the oscillator. For

using internal or external oscillator, this command should be exe-

cuted. The setting for this command is not affected by command “Set

Display On/Off” and “Set Annunciator Control Signal”. See command

“Set Internal / External Oscillator” for more information

Set Internal / External Oscillator

This command is used to select either internal or external oscilla-

tor. When internal oscillator is selected, feedback resistor between

OSC1 and OSC2 is needed. For external oscillation circuit, feed

clock input signal to OSC2 and leave OSC1 open.

Set Internal DC/DC Converter On/Off

Use this command to select the Internal DC/DC Converter to gen-

erate the VCC from AVDD. Disable the Internal DC/DC Converter if

external Vcc is provided.

Set Voltage Doubler / Tripler

Use this command to choose Doubler or Tripler when the Internal

DC/DC Converter is enabled.

MOTOROLA

MC141531

3–153

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