MC141539 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC141539

LCD Segment / Common Driver with Controller

Motorola => Freescale 

Command Description

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

The Dispaly On command turns the LCD Common and Segment

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

mand causes the conversion of data in GDDRAM to necessary

waveforms on the Common and Segment driving outputs. The on-

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

lator On” command should be sent before “Display On” is selected)

The Display Off command turns 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 Voltage Generator 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.

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 by one automatically after a read or

write operation. Refer “Address Enlacement Table” and command

“Set GDDRAM Page Address”.

Set GDDRAM Page Address

This command positions the row address to 1 of 4 possible posi-

tions in GDDRAM. Refer to figure 5.

Master Clear GDDRAM

This command is to clear the 480 byte Display Data RAM by set-

ting the RAM data to zero. Issue this command followed by a dummy

write command.

Set Vertical Scroll Value

This command is used to scroll the screen vertically with scroll

value 0 to 31. With scroll value equals to 0, Row 0 of GDDRAM is

mapped to Com0 and Row 1 through Row 31 are mapped to Com1

through Com31 respectively. With scroll value equal to 1, Row 1 of

GDDRAM is mapped to Com0, then Row 2 through Row 31 will be

mapped to Com1 through Com30 respectively and Row 0 will be

mapped to Com31.

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 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 instruction selects the mapping of GDDRAM to Common

Drivers for mechanical flexibility. There are 2 selected mappings:

1. Row 0 - Row 31 of GDDRAM to Com0 - Com31 respectively;

2. Row 0 - Row 31 of GDDRAM to Com31 - Com0 respectively.

See section “Display Output Description” for related information.

Set Annunciator Control Signals

This command is used to control the active states of the 4 stand

alone annunciator drivers.

Set Oscillator Enable / Disable

This command is used to either turn on / off Oscillator. For using

internal or external oscillator, this command should be executed. The

setting for this command is not affected by command “Set Display

On/Off” and “Set Annunciator On/Off”. See command “Ext/Int Oscilla-

tor” for more information

Set External / Internal 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 Clock Frequency

Use this command to choose from two different oscillation fre-

quencies (50kHz or 38.4kHz) to get the 60 Hz frame frequency. With

frequency high, 50 kHz clock frequency is preferred. 38.4kHz clock

frequency (low frequency) enable for power saving purpose.

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 Voltage Doubler or Tripler when the

Internal DC/DC Converter is enabled.

Set Internal Regulator On/Off

Choose bit option 0 to disable the Internal Regulator. Choose bit

option 1 to enable Internal Regulator which consists of the internal

contrast control and temperature compensation circuits.

Set Internal Voltage Divider On/Off

If the Internal Voltage Divider is disabled, external bias can be

used for VLL6 to VLL2. If the Internal Voltage Divider is enabled, the

internal circuit will automatically select the correct bias level accord-

ing to the number of multiplex. Refer to command “Set Bias Ratio ”.

Set Duty Cycle

This command is to select 16 mux or 32 mux display. When 16

mux is enabled, the unused 16 common outputs will be swinging

between VLL2 and VLL5 for dummy scan purpose and doubler will

be used.

Set Bias Ratio

This command sets the 1/5 bias or 1/7 bias for the divider output.

The selection should match the characteristic of LCD Panel.

Set Internal Contrast Control On/Off

This command is used to turn on or off the internal control of delta

voltage of the bias voltages. With bit option = 1, the software selec-

tion for delta bias voltage control is enabled. With bit option = 0, inter-

nal contrast control is disabled.

Increase / Decrease Contrast Level

If the internal contrast control is enabled, this command is used to

MC141539

3–136

MOTOROLA

Share Link: